Proguard收缩导致空指针异常
Proguard shrinking causes Null Pointer Exception
我的 android 应用程序中有一个视频 activity。
在禁用 proguard 的调试构建中，一切都像一个魅力。
但是在启用混淆器并且视频 activity 开始的发布版本中，我得到了一个 NPE。
我的 gradle 文件的一部分：
buildTypes {
debug {
applicationIdSuffix '.dev'
versionNameSuffix '-dev'
minifyEnabled false
shrinkResources false
}
release {
minifyEnabled true
shrinkResources true
debuggable false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release
}
}
异常：
java.lang.RuntimeException: Unable to start activity ComponentInfo{ua.com.tv24.news/ua.com.tv24.news.ui.activities.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access0(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at ua.com.tv24.news.ui.fragments.a.b.a(Unknown Source)
at android.support.v4.app.Fragment.i(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.j(Unknown Source)
at android.support.v4.app.p.onCreate(Unknown Source)
at android.support.v7.app.ActionBarActivity.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.a.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.b.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.MainActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access0(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
还有我的Activity：
package ua.com.tv24.news.ui.activities;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.FrameLayout;
import com.google.android.libraries.mediaframework.exoplayerextensions.Video;
import com.google.android.libraries.mediaframework.layeredvideo.PlaybackControlLayer;
import com.google.googlemediaframework.adplayer.ImaPlayer;
import de.greenrobot.event.EventBus;
import ua.com.tv24.news.R;
import ua.com.tv24.news.events.ui.VideoPreparedEvent;
public class DashVideoActivity extends ActionBarActivity implements PlaybackControlLayer.FullscreenCallback {
private ImaPlayer imaPlayer;
private FrameLayout videoPlayerContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EventBus.getDefault().register(this);
setContentView(R.layout.activity_dash_video);
videoPlayerContainer = (FrameLayout) findViewById(R.id.video_frame);
Bundle bundle = getIntent().getExtras();
String videoUrl = bundle.getString(VideoActivity.VIDEO_URL_EXTRA);
String appName = getString(R.string.app_name);
//TODO get url and name from extras
VideoItem video = new VideoItem(appName, new Video(videoUrl, Video.VideoType.DASH, ""),
null);
createImaPlayer(video);
}
@Override
protected void onResume() {
super.onResume();
if (imaPlayer != null) {
imaPlayer.play();
}
}
@Override
protected void onPause() {
if (imaPlayer != null) {
imaPlayer.pause();
}
super.onPause();
}
@Override
protected void onDestroy() {
if (imaPlayer != null) {
imaPlayer.release();
}
EventBus.getDefault().unregister(this);
super.onDestroy();
}
public void createImaPlayer(VideoItem videoListItem) {
if (imaPlayer != null) {
imaPlayer.release();
}
// If there was previously a video player in the container, remove it.
videoPlayerContainer.removeAllViews();
String adTagUrl = videoListItem.adUrl;
String videoTitle = videoListItem.title;
imaPlayer = new ImaPlayer(this,
videoPlayerContainer,
videoListItem.video,
videoTitle,
adTagUrl);
imaPlayer.setFullscreenCallback(this);
Resources res = getResources();
Drawable logo = res.getDrawable(R.drawable.launcher);
imaPlayer.setLogoImage(logo);
imaPlayer.play();
}
@Override
public void onGoToFullscreen() {
}
@Override
public void onReturnFromFullscreen() {
}
public static class VideoItem implements Parcelable {
/**
* The title of the video.
*/
public final String title;
/**
* The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
*/
public final Video video;
/**
* The URL of the VAST document which represents the ad.
*/
public final String adUrl;
/**
* @param title The title of the video.
* @param video The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
* @param adUrl The URL of the VAST document which represents the ad.
*/
public VideoItem(String title, Video video, String adUrl) {
this.title = title;
this.video = video;
this.adUrl = adUrl;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
}
}
public void onEventMainThread(VideoPreparedEvent event) {
View progress = findViewById(R.id.videoLoaderBar);
if (progress != null) {
progress.setVisibility(View.INVISIBLE);
}
}
}
还有我的proguard规则：
-dontwarn com.google.android.gms.**
# Picasso
-dontwarn com.squareup.okhttp.**
-keep class * extends java.util.ListResourceBundle {
protected Object[][] getContents();
}
-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
@com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
public static final ** CREATOR;
}
#okhttp
-keepnames class com.levelup.http.okhttp.** { *; }
-keepnames interface com.levelup.http.okhttp.** { *; }
-keepnames class com.squareup.okhttp.** { *; }
-keepnames interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.internal.http.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
#retrofit
-keepattributes Signature
-keepattributes *Annotation*
-keep class com.google.gson.** { *; }
-keep class com.google.inject.** { *; }
-keep class org.apache.http.* { *; }
-keep class org.apache.james.mime4j.* { *; }
-keep class javax.inject.** { *; }
-dontwarn rx.*
-keep class com.example.testobfuscation.** { *; }
-keepattributes Signature
-keep class sun.misc.Unsafe { *; }
-keep class retrofit.** { *; }
-keep interface retrofit.** { *; }
-keepclasseswithmembers class * {
@retrofit.http.* <methods>;
}
-keepclasseswithmembers class * {
@ua.* <methods>;
}
-dontwarn retrofit.appengine.**
-keep class ua.com.tv24.news.models.** { *; }
-keepattributes InnerClasses
#xml parser
-keep interface org.simpleframework.xml.** { *; }
-keep class org.simpleframework.xml.** { *; }
#eventBus
-keepclassmembers class ** {
public void onEvent(**);
}
-keepclassmembers class ** {
public void onEventMainThread(**);
}
#support v7
-keep class android.support.v7.** { *; }
#unusage classes
-dontwarn retrofit.appengine.UrlFetchClient
-dontwarn retrofit.RxSupport
-dontwarn com.google.ads.a.a
-dontwarn com.google.ads.a.c
-dontwarn com.google.ads.a.d
-dontwarn com.google.ads.a.f
-dontwarn com.google.android.exoplayer.hls.HlsMediaPlaylistParser
-dontwarn okio.DeflaterSink
-dontwarn org.simpleframework.xml.stream.StreamProvider
-dontwarn okio.Okio
-dontwarn org.simpleframework.xml.stream.StreamReader
-dontwarn org.simpleframework.xml.stream.StreamReader$Entry
-dontwarn org.simpleframework.xml.stream.StreamReader$Start
-dontwarn org.simpleframework.xml.stream.StreamReader$Text
-dontwarn retrofit.RestMethodInfo$RxSupport
-dontwarn retrofit.RxSupport
-dontwarn retrofit.RxSupport
请注意，您从 ProGuard 处理中排除了 类 和方法：
# Hide warnings about references to newer platforms in the library
-dontwarn android.support.v7.**
# don't process support library
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }
如果涉及Reflection，则通常会出现此错误，因为在这种情况下，Proguard 无法解析依赖项。
我刚刚看到您错过了 ProGuard 文件中的接口（作为例外）：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ...
这个问题发生在proguard的优化过程中，但我的问题有点不同，崩溃日志是：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cmcm.gamemoney_sdk_style2/com.cmcm.gamemoney.Main3Activity}: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
Caused by: android.view.InflateException: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.l.s(AppCompatDelegateImpl.java:607)
at android.support.v7.app.l.r(AppCompatDelegateImpl.java:518)
at android.support.v7.app.l.b(AppCompatDelegateImpl.java:466)
at android.support.v7.app.i.setContentView(AppCompatActivity.java:140)
at com.cmcm.gamemoney_sdk.Main3Activity.onCreate(Main3Activity.java:41)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1221)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.l.a()' on a null object reference
at android.support.v7.widget.s.setBackgroundDrawable(AppCompatImageButton.java:124)
at android.view.View.setBackground(View.java:21620)
at android.view.View.<init>(View.java:5553)
at android.widget.ImageView.<init>(ImageView.java:176)
at android.widget.ImageButton.<init>(ImageButton.java:96)
at android.widget.ImageButton.<init>(ImageButton.java:92)
at android.support.v7.widget.s.<init>(AppCompatImageButton.java:73)
at android.support.v7.widget.Toolbar.y(Toolbar.java:1362)
at android.support.v7.widget.Toolbar.c(Toolbar.java:918)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:322)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:229)
... 29 more
重点在AppCompatImageButton#setBackgroundDrawable()所以我反编译了apk的代码，发现混淆方法代码是这样的：
public final void setBackgroundDrawable(Drawable var1) {
super.setBackgroundDrawable(var1);
this.a.a();
}
与之前的proguad代码相比是：
public void setImageDrawable(@Nullable Drawable drawable) {
super.setImageDrawable(drawable);
if (this.mImageHelper != null) {
this.mImageHelper.applySupportImageTint();
}
}
这意味着 proguard 进程错误地删除了 null check，为什么？在检查了 AppCompatImageButton 的源代码后，我发现 mImageHelper 被定义为 final 也意味着在构造函数中初始化：
private final AppCompatImageHelper mImageHelper;
public AppCompatImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(TintContextWrapper.wrap(context), attrs, defStyleAttr);
this.mBackgroundTintHelper = new AppCompatBackgroundHelper(this);
this.mBackgroundTintHelper.loadFromAttributes(attrs, defStyleAttr);
this.mImageHelper = new AppCompatImageHelper(this);
this.mImageHelper.loadFromAttributes(attrs, defStyleAttr);
}
问题出在初始化之前，super是构造函数的第一行，最终在初始化之前调用了setImageDrawable()，导致崩溃。
我不喜欢用-keep class android.support.v7.** { *; }来解决这个问题，就像我说的，这是绕过问题，也放下了proguard的所有优点，使apk的大小不必要地增长。
第一个解决方案是在 proguard 配置中声明以标记不优化：
-dontoptimize
但这将禁用所有优化，不会利用优化过程。
所以我能找到的最佳解决方案是：
-optimizations !field/propagation/value
它标记不优化固定值的调用。
顺便说一句，在跟踪过程中真正的问题在哪里，我从Windows 10切换到macOS，发现问题只出现在Windows 10，我检查差异只发现了jvm版本不等于，macOS 是“1.8.0_73”但Windows 10 是“1.8.0_221”，否则如 proguard 版本都是 6.0.3，并且都是 proguard-base -6.0.3.jar的md5相同.
更新 1（六小时后）：
还有一些问题，解决了这个问题继续前进，我遇到了另一个问题：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cmcm.gamemoney_sdk_style2/com.cmcm.cmgame.activity.H5GameActivity}: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.cmcm.cmgame.e.a$a
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.cmcm.cmgame.e.a$a
at android.os.Parcel.readParcelableCreator(Parcel.java:2875)
at android.os.Parcel.readParcelable(Parcel.java:2797)
at android.os.Parcel.readValue(Parcel.java:2700)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3067)
at android.os.BaseBundle.unparcel(BaseBundle.java:257)
at android.os.BaseBundle.getString(BaseBundle.java:1086)
at android.content.Intent.getStringExtra(Intent.java:7718)
at com.cmcm.cmgame.activity.H5GameActivity.M(H5GameActivity.java:209)
at com.cmcm.cmgame.activity.H5GameActivity.onCreate(H5GameActivity.java:628)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1221)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
... 9 more
需要一个名为 CREATOR
的 Parcelable.Creator 对象
我记得 android 已经将 Parcelable 的 CREATOR 在其默认混淆文件中保持清晰，为什么不应用？
我有 build.gradle 打印默认混淆文件位置：
println "default android proguard file : ${getDefaultProguardFile('proguard-android.txt')}"
buildTypes {
release {
signingConfig android.signingConfigs.releaseConfig
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
日志是：
default android proguard file : C:\dev\cmgameSdkDemo_localconfig\build\intermediates\proguard-files\proguard-android.txt-3.2.1
而且我没有相应地在该目录中找到 proguard-android.txt-3.2.1 文件，这意味着默认的 proguard 文件永远不会应用所以这两个问题出现了，我转到 MacOS 并拿走这个文件，我头上见：
# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html
#
# Starting with version 2.2 of the Android plugin for Gradle, this file is distributed together with
# the plugin and unpacked at build-time. The files in $ANDROID_HOME are no longer maintained and
# will be ignored by new version of the Android plugin for Gradle.
正如我之前提到的，该文件还包含 -dontoptimize，是的，我使用了 com.android.tools.build:gradle:3.2.1。
所以，真正的问题是 gradle(gradle-5.0-milestone-1-all used) on Windows 10 failed to(or never) pull proguard-android.txt-3.2.1 到项目的根构建文件夹使其无法应用和后续问题，我认为这是 [=123 的 Android 插件的某种错误=]，我们唯一能做的就是丢弃getDefaultProguardFile，使用本地默认的android.
proguard文件
proguardFiles "${rootDir}/proguard-android.txt-3.2.1", 'proguard-rules.pro'
我从我的 MacBook 复制那个 proguard-android.txt-3.2.1 文件，如果你不知道在哪里可以找到它，你可以去你的 android sdk 安装目录，那个文件是 tools/proguard/proguard-android.txt
更新2（15小时后）：
这个问题与项目有关，我在 Windows 10 上切换到另一个项目，Gradle 版本仍然是 gradle-5.0-milestone-1-所有 ，以及 Gradle 的 Android 插件仍然 com.android.tools.build:gradle:3.2.1，该项目可以拉 proguard-android.txt-3.2.1 而不会崩溃。
所以最好的解决方案是重命名项目，然后进入项目目录，删除根目录下的.idea和.gradle，删除所有*.iml在子模块中，一路都是比以前创建一个新项目，最后在 AndroidStudio 中打开它，问题就消失了。
另一种解决方法是进入C:\Users\lingyx目录，删除.AndroidStudioPreview4.0\system\caches\project_resources\$project_name ，对于 linux 它将是 ~/.AndroidStudio[版本信息取决于您的环境]/system/caches/project_resources/$project_name
我的 android 应用程序中有一个视频 activity。 在禁用 proguard 的调试构建中，一切都像一个魅力。 但是在启用混淆器并且视频 activity 开始的发布版本中，我得到了一个 NPE。
我的 gradle 文件的一部分：
buildTypes {
debug {
applicationIdSuffix '.dev'
versionNameSuffix '-dev'
minifyEnabled false
shrinkResources false
}
release {
minifyEnabled true
shrinkResources true
debuggable false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release
}
}
异常：
java.lang.RuntimeException: Unable to start activity ComponentInfo{ua.com.tv24.news/ua.com.tv24.news.ui.activities.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access0(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at ua.com.tv24.news.ui.fragments.a.b.a(Unknown Source)
at android.support.v4.app.Fragment.i(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.j(Unknown Source)
at android.support.v4.app.p.onCreate(Unknown Source)
at android.support.v7.app.ActionBarActivity.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.a.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.b.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.MainActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access0(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
还有我的Activity：
package ua.com.tv24.news.ui.activities;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.FrameLayout;
import com.google.android.libraries.mediaframework.exoplayerextensions.Video;
import com.google.android.libraries.mediaframework.layeredvideo.PlaybackControlLayer;
import com.google.googlemediaframework.adplayer.ImaPlayer;
import de.greenrobot.event.EventBus;
import ua.com.tv24.news.R;
import ua.com.tv24.news.events.ui.VideoPreparedEvent;
public class DashVideoActivity extends ActionBarActivity implements PlaybackControlLayer.FullscreenCallback {
private ImaPlayer imaPlayer;
private FrameLayout videoPlayerContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EventBus.getDefault().register(this);
setContentView(R.layout.activity_dash_video);
videoPlayerContainer = (FrameLayout) findViewById(R.id.video_frame);
Bundle bundle = getIntent().getExtras();
String videoUrl = bundle.getString(VideoActivity.VIDEO_URL_EXTRA);
String appName = getString(R.string.app_name);
//TODO get url and name from extras
VideoItem video = new VideoItem(appName, new Video(videoUrl, Video.VideoType.DASH, ""),
null);
createImaPlayer(video);
}
@Override
protected void onResume() {
super.onResume();
if (imaPlayer != null) {
imaPlayer.play();
}
}
@Override
protected void onPause() {
if (imaPlayer != null) {
imaPlayer.pause();
}
super.onPause();
}
@Override
protected void onDestroy() {
if (imaPlayer != null) {
imaPlayer.release();
}
EventBus.getDefault().unregister(this);
super.onDestroy();
}
public void createImaPlayer(VideoItem videoListItem) {
if (imaPlayer != null) {
imaPlayer.release();
}
// If there was previously a video player in the container, remove it.
videoPlayerContainer.removeAllViews();
String adTagUrl = videoListItem.adUrl;
String videoTitle = videoListItem.title;
imaPlayer = new ImaPlayer(this,
videoPlayerContainer,
videoListItem.video,
videoTitle,
adTagUrl);
imaPlayer.setFullscreenCallback(this);
Resources res = getResources();
Drawable logo = res.getDrawable(R.drawable.launcher);
imaPlayer.setLogoImage(logo);
imaPlayer.play();
}
@Override
public void onGoToFullscreen() {
}
@Override
public void onReturnFromFullscreen() {
}
public static class VideoItem implements Parcelable {
/**
* The title of the video.
*/
public final String title;
/**
* The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
*/
public final Video video;
/**
* The URL of the VAST document which represents the ad.
*/
public final String adUrl;
/**
* @param title The title of the video.
* @param video The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
* @param adUrl The URL of the VAST document which represents the ad.
*/
public VideoItem(String title, Video video, String adUrl) {
this.title = title;
this.video = video;
this.adUrl = adUrl;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
}
}
public void onEventMainThread(VideoPreparedEvent event) {
View progress = findViewById(R.id.videoLoaderBar);
if (progress != null) {
progress.setVisibility(View.INVISIBLE);
}
}
}
还有我的proguard规则：
-dontwarn com.google.android.gms.**
# Picasso
-dontwarn com.squareup.okhttp.**
-keep class * extends java.util.ListResourceBundle {
protected Object[][] getContents();
}
-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
@com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
public static final ** CREATOR;
}
#okhttp
-keepnames class com.levelup.http.okhttp.** { *; }
-keepnames interface com.levelup.http.okhttp.** { *; }
-keepnames class com.squareup.okhttp.** { *; }
-keepnames interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.internal.http.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
#retrofit
-keepattributes Signature
-keepattributes *Annotation*
-keep class com.google.gson.** { *; }
-keep class com.google.inject.** { *; }
-keep class org.apache.http.* { *; }
-keep class org.apache.james.mime4j.* { *; }
-keep class javax.inject.** { *; }
-dontwarn rx.*
-keep class com.example.testobfuscation.** { *; }
-keepattributes Signature
-keep class sun.misc.Unsafe { *; }
-keep class retrofit.** { *; }
-keep interface retrofit.** { *; }
-keepclasseswithmembers class * {
@retrofit.http.* <methods>;
}
-keepclasseswithmembers class * {
@ua.* <methods>;
}
-dontwarn retrofit.appengine.**
-keep class ua.com.tv24.news.models.** { *; }
-keepattributes InnerClasses
#xml parser
-keep interface org.simpleframework.xml.** { *; }
-keep class org.simpleframework.xml.** { *; }
#eventBus
-keepclassmembers class ** {
public void onEvent(**);
}
-keepclassmembers class ** {
public void onEventMainThread(**);
}
#support v7
-keep class android.support.v7.** { *; }
#unusage classes
-dontwarn retrofit.appengine.UrlFetchClient
-dontwarn retrofit.RxSupport
-dontwarn com.google.ads.a.a
-dontwarn com.google.ads.a.c
-dontwarn com.google.ads.a.d
-dontwarn com.google.ads.a.f
-dontwarn com.google.android.exoplayer.hls.HlsMediaPlaylistParser
-dontwarn okio.DeflaterSink
-dontwarn org.simpleframework.xml.stream.StreamProvider
-dontwarn okio.Okio
-dontwarn org.simpleframework.xml.stream.StreamReader
-dontwarn org.simpleframework.xml.stream.StreamReader$Entry
-dontwarn org.simpleframework.xml.stream.StreamReader$Start
-dontwarn org.simpleframework.xml.stream.StreamReader$Text
-dontwarn retrofit.RestMethodInfo$RxSupport
-dontwarn retrofit.RxSupport
-dontwarn retrofit.RxSupport
请注意，您从 ProGuard 处理中排除了 类 和方法：
# Hide warnings about references to newer platforms in the library
-dontwarn android.support.v7.**
# don't process support library
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }
如果涉及Reflection，则通常会出现此错误，因为在这种情况下，Proguard 无法解析依赖项。
我刚刚看到您错过了 ProGuard 文件中的接口（作为例外）：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ...
这个问题发生在proguard的优化过程中，但我的问题有点不同，崩溃日志是：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cmcm.gamemoney_sdk_style2/com.cmcm.gamemoney.Main3Activity}: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: android.view.InflateException: Binary XML file line #37: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
Caused by: android.view.InflateException: Binary XML file line #37: Error inflating class android.support.v7.widget.Toolbar
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.l.s(AppCompatDelegateImpl.java:607)
at android.support.v7.app.l.r(AppCompatDelegateImpl.java:518)
at android.support.v7.app.l.b(AppCompatDelegateImpl.java:466)
at android.support.v7.app.i.setContentView(AppCompatActivity.java:140)
at com.cmcm.gamemoney_sdk.Main3Activity.onCreate(Main3Activity.java:41)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1221)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.l.a()' on a null object reference
at android.support.v7.widget.s.setBackgroundDrawable(AppCompatImageButton.java:124)
at android.view.View.setBackground(View.java:21620)
at android.view.View.<init>(View.java:5553)
at android.widget.ImageView.<init>(ImageView.java:176)
at android.widget.ImageButton.<init>(ImageButton.java:96)
at android.widget.ImageButton.<init>(ImageButton.java:92)
at android.support.v7.widget.s.<init>(AppCompatImageButton.java:73)
at android.support.v7.widget.Toolbar.y(Toolbar.java:1362)
at android.support.v7.widget.Toolbar.c(Toolbar.java:918)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:322)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:229)
... 29 more
重点在AppCompatImageButton#setBackgroundDrawable()所以我反编译了apk的代码，发现混淆方法代码是这样的：
public final void setBackgroundDrawable(Drawable var1) {
super.setBackgroundDrawable(var1);
this.a.a();
}
与之前的proguad代码相比是：
public void setImageDrawable(@Nullable Drawable drawable) {
super.setImageDrawable(drawable);
if (this.mImageHelper != null) {
this.mImageHelper.applySupportImageTint();
}
}
这意味着 proguard 进程错误地删除了 null check，为什么？在检查了 AppCompatImageButton 的源代码后，我发现 mImageHelper 被定义为 final 也意味着在构造函数中初始化：
private final AppCompatImageHelper mImageHelper;
public AppCompatImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(TintContextWrapper.wrap(context), attrs, defStyleAttr);
this.mBackgroundTintHelper = new AppCompatBackgroundHelper(this);
this.mBackgroundTintHelper.loadFromAttributes(attrs, defStyleAttr);
this.mImageHelper = new AppCompatImageHelper(this);
this.mImageHelper.loadFromAttributes(attrs, defStyleAttr);
}
问题出在初始化之前，super是构造函数的第一行，最终在初始化之前调用了setImageDrawable()，导致崩溃。
我不喜欢用-keep class android.support.v7.** { *; }来解决这个问题，就像我说的，这是绕过问题，也放下了proguard的所有优点，使apk的大小不必要地增长。
第一个解决方案是在 proguard 配置中声明以标记不优化：
-dontoptimize
但这将禁用所有优化，不会利用优化过程。
所以我能找到的最佳解决方案是：
-optimizations !field/propagation/value
它标记不优化固定值的调用。
顺便说一句，在跟踪过程中真正的问题在哪里，我从Windows 10切换到macOS，发现问题只出现在Windows 10，我检查差异只发现了jvm版本不等于，macOS 是“1.8.0_73”但Windows 10 是“1.8.0_221”，否则如 proguard 版本都是 6.0.3，并且都是 proguard-base -6.0.3.jar的md5相同.
更新 1（六小时后）：
还有一些问题，解决了这个问题继续前进，我遇到了另一个问题：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cmcm.gamemoney_sdk_style2/com.cmcm.cmgame.activity.H5GameActivity}: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.cmcm.cmgame.e.a$a
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6942)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.cmcm.cmgame.e.a$a
at android.os.Parcel.readParcelableCreator(Parcel.java:2875)
at android.os.Parcel.readParcelable(Parcel.java:2797)
at android.os.Parcel.readValue(Parcel.java:2700)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3067)
at android.os.BaseBundle.unparcel(BaseBundle.java:257)
at android.os.BaseBundle.getString(BaseBundle.java:1086)
at android.content.Intent.getStringExtra(Intent.java:7718)
at com.cmcm.cmgame.activity.H5GameActivity.M(H5GameActivity.java:209)
at com.cmcm.cmgame.activity.H5GameActivity.onCreate(H5GameActivity.java:628)
at android.app.Activity.performCreate(Activity.java:7183)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1221)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
... 9 more
需要一个名为 CREATOR
的 Parcelable.Creator 对象我记得 android 已经将 Parcelable 的 CREATOR 在其默认混淆文件中保持清晰，为什么不应用？
我有 build.gradle 打印默认混淆文件位置：
println "default android proguard file : ${getDefaultProguardFile('proguard-android.txt')}"
buildTypes {
release {
signingConfig android.signingConfigs.releaseConfig
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
日志是：
default android proguard file : C:\dev\cmgameSdkDemo_localconfig\build\intermediates\proguard-files\proguard-android.txt-3.2.1
而且我没有相应地在该目录中找到 proguard-android.txt-3.2.1 文件，这意味着默认的 proguard 文件永远不会应用所以这两个问题出现了，我转到 MacOS 并拿走这个文件，我头上见：
# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html
#
# Starting with version 2.2 of the Android plugin for Gradle, this file is distributed together with
# the plugin and unpacked at build-time. The files in $ANDROID_HOME are no longer maintained and
# will be ignored by new version of the Android plugin for Gradle.
正如我之前提到的，该文件还包含 -dontoptimize，是的，我使用了 com.android.tools.build:gradle:3.2.1。
所以，真正的问题是 gradle(gradle-5.0-milestone-1-all used) on Windows 10 failed to(or never) pull proguard-android.txt-3.2.1 到项目的根构建文件夹使其无法应用和后续问题，我认为这是 [=123 的 Android 插件的某种错误=]，我们唯一能做的就是丢弃getDefaultProguardFile，使用本地默认的android.
proguard文件proguardFiles "${rootDir}/proguard-android.txt-3.2.1", 'proguard-rules.pro'
我从我的 MacBook 复制那个 proguard-android.txt-3.2.1 文件，如果你不知道在哪里可以找到它，你可以去你的 android sdk 安装目录，那个文件是 tools/proguard/proguard-android.txt
更新2（15小时后）：
这个问题与项目有关，我在 Windows 10 上切换到另一个项目，Gradle 版本仍然是 gradle-5.0-milestone-1-所有 ，以及 Gradle 的 Android 插件仍然 com.android.tools.build:gradle:3.2.1，该项目可以拉 proguard-android.txt-3.2.1 而不会崩溃。
所以最好的解决方案是重命名项目，然后进入项目目录，删除根目录下的.idea和.gradle，删除所有*.iml在子模块中，一路都是比以前创建一个新项目，最后在 AndroidStudio 中打开它，问题就消失了。
另一种解决方法是进入C:\Users\lingyx目录，删除.AndroidStudioPreview4.0\system\caches\project_resources\$project_name ，对于 linux 它将是 ~/.AndroidStudio[版本信息取决于您的环境]/system/caches/project_resources/$project_name