致力于 Android 音乐播放器项目，并 运行 解决我的应用程序在启动时崩溃的问题：
Working on Android Music Player Project, and ran into the issue where my app crashes on start up:
我正在尝试使用向上滑动面板添加播放器，但应用程序在启动时崩溃了。如果您想查看我的完整代码；
https://github.com/Kailash8460/poptune.git
MainActivity.java
package com.example.poptunemusicplayerapplication;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import com.example.poptunemusicplayerapplication.fragments.MainFragment;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;
public class MainActivity extends AppCompatActivity {
private static final int KEY_PER = 123;
private SlidingUpPanelLayout panelLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) !=
PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this, new String[]
{Manifest.permission.READ_EXTERNAL_STORAGE}, KEY_PER);
return;
}
else {
UiInitialize();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case KEY_PER:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
UiInitialize();
}
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void UiInitialize() {
ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(this));
panelLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
Fragment fragment = new MainFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment);
transaction.commit();
/*List<Song> songList = new SongLoader().getAllSongs(this);
for (Song song : songList){
Log.i("DATA","Title:" + song.title);
}*/
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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"
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="@+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
MainFragment.java
这里没有关于 SongsFragment、ArtistFragment 和 AlbumFragment 文件的问题，因为在添加向上滑动面板之前我有 运行 这个应用程序并且成功 运行 但是在添加这个向上滑动面板应用程序之后在启动时崩溃。
package com.example.poptunemusicplayerapplication.fragments;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.poptunemusicplayerapplication.R;
import com.google.android.material.tabs.TabLayout;
import java.util.ArrayList;
import java.util.List;
public class MainFragment extends Fragment {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public MainFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);
setUpViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
return rootView;
}
private void setUpViewPager(ViewPager viewPager) {
FragmentAdapter adapter = new FragmentAdapter(getActivity().getSupportFragmentManager());
adapter.AddFragments(new SongsFragment(), "Songs");
adapter.AddFragments(new ArtistFragment(), "Artist");
adapter.AddFragments(new AlbumFragment(), "Album");
viewPager.setAdapter(adapter);
}
private class FragmentAdapter extends FragmentPagerAdapter {
private List<Fragment> fragmentList = new ArrayList<>();
private List<String> titleList = new ArrayList<>();
public FragmentAdapter(@NonNull FragmentManager fm) {
super(fm);
}
@NonNull
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
public void AddFragments(Fragment fragment, String title) {
fragmentList.add(fragment);
titleList.add(title);
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return titleList.get(position);
}
}
}
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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"
android:id="@+id/fragmentmainlist"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.MainFragment">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/appbar"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="@+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
android:background="?attr/colorPrimary"
app:popupTheme="@style/Theme.AppCompat.Light"/>
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tabs"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/view_pager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.poptunemusicplayerapplication, PID: 28426
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poptunemusicplayerapplication/com.example.poptunemusicplayerapplication.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
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.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: java.lang.IllegalArgumentException: gravity must be set to either top or bottom
at com.sothree.slidinguppanel.SlidingUpPanelLayout.setGravity(SlidingUpPanelLayout.java:366)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:288)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:270)
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.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
getting error at MainActivity.java:39
MainActivity.java的第 39 行：-
setContentView(R.layout.activity_main);
查看 SlidingUpPanelLayout 的 layout in the demo app 后，我发现它需要设置 android:gravity 属性，而不是 android:layout_gravity。
为您的布局试试这个：
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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"
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="@+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
我正在尝试使用向上滑动面板添加播放器，但应用程序在启动时崩溃了。如果您想查看我的完整代码； https://github.com/Kailash8460/poptune.git
MainActivity.java
package com.example.poptunemusicplayerapplication;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import com.example.poptunemusicplayerapplication.fragments.MainFragment;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;
public class MainActivity extends AppCompatActivity {
private static final int KEY_PER = 123;
private SlidingUpPanelLayout panelLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) !=
PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this, new String[]
{Manifest.permission.READ_EXTERNAL_STORAGE}, KEY_PER);
return;
}
else {
UiInitialize();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case KEY_PER:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
UiInitialize();
}
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void UiInitialize() {
ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(this));
panelLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
Fragment fragment = new MainFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment);
transaction.commit();
/*List<Song> songList = new SongLoader().getAllSongs(this);
for (Song song : songList){
Log.i("DATA","Title:" + song.title);
}*/
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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"
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="@+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
MainFragment.java 这里没有关于 SongsFragment、ArtistFragment 和 AlbumFragment 文件的问题，因为在添加向上滑动面板之前我有 运行 这个应用程序并且成功 运行 但是在添加这个向上滑动面板应用程序之后在启动时崩溃。
package com.example.poptunemusicplayerapplication.fragments;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.poptunemusicplayerapplication.R;
import com.google.android.material.tabs.TabLayout;
import java.util.ArrayList;
import java.util.List;
public class MainFragment extends Fragment {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
public MainFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);
setUpViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
return rootView;
}
private void setUpViewPager(ViewPager viewPager) {
FragmentAdapter adapter = new FragmentAdapter(getActivity().getSupportFragmentManager());
adapter.AddFragments(new SongsFragment(), "Songs");
adapter.AddFragments(new ArtistFragment(), "Artist");
adapter.AddFragments(new AlbumFragment(), "Album");
viewPager.setAdapter(adapter);
}
private class FragmentAdapter extends FragmentPagerAdapter {
private List<Fragment> fragmentList = new ArrayList<>();
private List<String> titleList = new ArrayList<>();
public FragmentAdapter(@NonNull FragmentManager fm) {
super(fm);
}
@NonNull
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
public void AddFragments(Fragment fragment, String title) {
fragmentList.add(fragment);
titleList.add(title);
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return titleList.get(position);
}
}
}
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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"
android:id="@+id/fragmentmainlist"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.MainFragment">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/appbar"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="@+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
android:background="?attr/colorPrimary"
app:popupTheme="@style/Theme.AppCompat.Light"/>
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tabs"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/view_pager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.poptunemusicplayerapplication, PID: 28426
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poptunemusicplayerapplication/com.example.poptunemusicplayerapplication.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
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.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Caused by: java.lang.IllegalArgumentException: gravity must be set to either top or bottom
at com.sothree.slidinguppanel.SlidingUpPanelLayout.setGravity(SlidingUpPanelLayout.java:366)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:288)
at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:270)
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.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7025)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
getting error at MainActivity.java:39
MainActivity.java的第 39 行：-
setContentView(R.layout.activity_main);
查看 SlidingUpPanelLayout 的 layout in the demo app 后，我发现它需要设置 android:gravity 属性，而不是 android:layout_gravity。
为您的布局试试这个：
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout 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"
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
app:umanoPanelHeight="68dp"
app:umanoShadowHeight="4dp"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout
android:id="@+id/control_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>