无法实例化 class: android.support.w7.widget.SearchView
Cannot instantiate class: android.support.w7.widget.SearchView
我要疯了。我一直在努力弄清楚如何实现 SearchView，但无论我尝试多少种不同的解决方案，我都会 运行 陷入同一个问题。我以为只是我的项目有问题，所以我创建了一个新项目，我唯一尝试实现的是 SearchView，但得到了同样的错误。我正在使用 Android Studio 1.5 但 运行 在 1.3 和 1.4 上遇到了同样的问题。我下载了 API 21,22,23 以及所有额外的工具，包括支持库。
这是错误日志：
11-28 15:35:54.061 18015-18015/? W/SupportMenuInflater: Cannot instantiate class: android.support.w7.widget.SearchView
java.lang.ClassNotFoundException: Didn't find class "android.support.w7.widget.SearchView" on path: DexPathList[[zip file "/data/app/com.gevdev.tesssst-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v7.view.SupportMenuInflater$MenuState.newInstance(SupportMenuInflater.java:497)
at android.support.v7.view.SupportMenuInflater$MenuState.setItem(SupportMenuInflater.java:458)
at android.support.v7.view.SupportMenuInflater$MenuState.addItem(SupportMenuInflater.java:479)
at android.support.v7.view.SupportMenuInflater.parseMenu(SupportMenuInflater.java:196)
at android.support.v7.view.SupportMenuInflater.inflate(SupportMenuInflater.java:118)
at com.gevdev.tesssst.MainActivity.onCreateOptionsMenu(MainActivity.java:36)
at android.app.Activity.onCreatePanelMenu(Activity.java:3025)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:298)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:241)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:443)
at android.support.v7.app.ToolbarActionBar.run(ToolbarActionBar.java:60)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
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:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Suppressed: java.lang.ClassNotFoundException: android.support.w7.widget.SearchView
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 22 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
这是我的Android清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gevdev.tesssst">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
主要Activity
package com.gevdev.tesssst;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.SearchView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
MenuItem searchItem = menu.findItem(R.id.action_settings);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我的菜单xml文件
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.gevdev.tesssst.MainActivity.MainActivity">
<item
android:id="@+id/action_settings"
android:title="Search"
android:icon="@mipmap/ic_launcher"
app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.support.w7.widget.SearchView" >
</item>
应用 build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.gevdev.tesssst"
minSdkVersion 21
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
}
我只是不确定此时该做什么。我已经查看了所有其他人遇到同样问题的帖子，但我认为他们中的任何一个都不适用于我。
您的 menu.xml 中有 android.support.w7.widget.SearchView。必须
android.support.v7.widget.SearchView
"w" 看起来很像 "v"
我要疯了。我一直在努力弄清楚如何实现 SearchView，但无论我尝试多少种不同的解决方案，我都会 运行 陷入同一个问题。我以为只是我的项目有问题，所以我创建了一个新项目，我唯一尝试实现的是 SearchView，但得到了同样的错误。我正在使用 Android Studio 1.5 但 运行 在 1.3 和 1.4 上遇到了同样的问题。我下载了 API 21,22,23 以及所有额外的工具，包括支持库。
这是错误日志：
11-28 15:35:54.061 18015-18015/? W/SupportMenuInflater: Cannot instantiate class: android.support.w7.widget.SearchView
java.lang.ClassNotFoundException: Didn't find class "android.support.w7.widget.SearchView" on path: DexPathList[[zip file "/data/app/com.gevdev.tesssst-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v7.view.SupportMenuInflater$MenuState.newInstance(SupportMenuInflater.java:497)
at android.support.v7.view.SupportMenuInflater$MenuState.setItem(SupportMenuInflater.java:458)
at android.support.v7.view.SupportMenuInflater$MenuState.addItem(SupportMenuInflater.java:479)
at android.support.v7.view.SupportMenuInflater.parseMenu(SupportMenuInflater.java:196)
at android.support.v7.view.SupportMenuInflater.inflate(SupportMenuInflater.java:118)
at com.gevdev.tesssst.MainActivity.onCreateOptionsMenu(MainActivity.java:36)
at android.app.Activity.onCreatePanelMenu(Activity.java:3025)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:298)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:241)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:85)
at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:443)
at android.support.v7.app.ToolbarActionBar.run(ToolbarActionBar.java:60)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Suppressed: java.lang.ClassNotFoundException: android.support.w7.widget.SearchView
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 22 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
这是我的Android清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gevdev.tesssst">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
主要Activity
package com.gevdev.tesssst;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.SearchView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
MenuItem searchItem = menu.findItem(R.id.action_settings);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我的菜单xml文件
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.gevdev.tesssst.MainActivity.MainActivity">
<item
android:id="@+id/action_settings"
android:title="Search"
android:icon="@mipmap/ic_launcher"
app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.support.w7.widget.SearchView" >
</item>
应用 build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.gevdev.tesssst"
minSdkVersion 21
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
}
我只是不确定此时该做什么。我已经查看了所有其他人遇到同样问题的帖子，但我认为他们中的任何一个都不适用于我。
您的 menu.xml 中有 android.support.w7.widget.SearchView。必须
android.support.v7.widget.SearchView
"w" 看起来很像 "v"