设备重启后，我想运行我的接收器，以便设备可以在设备屏幕打开或关闭时播放音频，而无需通过应用程序手动设置。
音乐列表.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music_layout);
startService(new Intent(getApplicationContext(), LockScreenService.class));
//other codes
});
//send chosen music
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(lockIsChosen!=null) {
//other codes
try {
Intent i = new Intent("my.action");
i.putExtra("posLock", newPosition2).putExtra("songlistLock", mySongs).putExtra("lockSound", "lock");
sendBroadcast(i);
}catch (Exception e) {
Log.e(TAG, "Intent error");
}
finish();
}
if(unlockIsChosen!=null) {
//other codes
try {
Intent i = new Intent("my.action.unlock");
i.putExtra("posUnlock", newPosition3).putExtra("songlistUnlock", mySongs).putExtra("unlockSound", "unlock");
sendBroadcast(i);
}catch (Exception e) {
Log.e(TAG, "Intent error2");
}
finish();
}
}
});
这是我在我的接收器中写的
public class LockScreenReceiver extends BroadcastReceiver {
MediaPlayer mp;
ArrayList<File> mySongs;
ArrayList<File> mySongs2;
Uri u;
Uri u2;
AudioManager am;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
am = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
if(action.equals(Intent.ACTION_BOOT_COMPLETED)) {
Intent service = new Intent(context, LockScreenService.class);
context.startService(service);
//I tried this just for testing, but no toast is shown after device reboot
Toast.makeText(context, u2.toString(), Toast.LENGTH_SHORT).show();
}
if(action.equals("my.action")) {
Bundle b = intent.getExtras();
mySongs = (ArrayList) b.getParcelableArrayList("songlistLock");
int position = b.getInt("posLock", 0);
u = Uri.parse(mySongs.get(position).toString());
}
if(action.equals("my.action.unlock")) {
Bundle b = intent.getExtras();
mySongs2 = (ArrayList) b.getParcelableArrayList("songlistUnlock");
int position = b.getInt("posUnlock", 0);
u2 = Uri.parse(mySongs2.get(position).toString());
}
if (action.equals(Intent.ACTION_SCREEN_ON) && am.getRingerMode() == AudioManager.RINGER_MODE_NORMAL)
{
if(u2!=null) {
stopPlaying();
mp = MediaPlayer.create(context, u2);
mp.start();
Toast.makeText(context, u2.toString(), Toast.LENGTH_SHORT).show();
}
}
else if (action.equals(Intent.ACTION_SCREEN_OFF) && am.getRingerMode() == AudioManager.RINGER_MODE_NORMAL)
{
if(u!=null) {
stopPlaying();
mp = MediaPlayer.create(context, u);
mp.start();
Toast.makeText(context, u.toString(), Toast.LENGTH_SHORT).show();
}
}
}
private void stopPlaying() {
if (mp != null) {
mp.stop();
mp.release();
mp = null;
}
}
}
这是服务类
public class LockScreenService extends Service {
BroadcastReceiver receiver;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
@SuppressWarnings("deprecation")
public void onCreate() {
//Start listening for the Screen On, Screen Off, and Boot completed actions
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_BOOT_COMPLETED);
//Set up a receiver to listen for the Intents in this Service
receiver = new LockScreenReceiver();
registerReceiver(receiver, filter);
registerReceiver( receiver, new IntentFilter( "my.action" ) );
registerReceiver( receiver, new IntentFilter( "my.action.unlock" ) );
//Toast is not shown after device reboot
Toast.makeText(getApplicationContext(), "Starting service now", Toast.LENGTH_SHORT).show();
super.onCreate();
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}
我的 list ，我相信它没有任何问题
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_SERVICE"/>
<service android:name=".LockScreenService" />
<receiver
android:name=".LockScreenReceiver">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="my.action" />
<action android:name="my.action.unlock" />
</intent-filter>
</receiver>
我做错了什么？有人说我应该在服务上做我的事情，但这样做会使应用程序在启动时崩溃。我被困在这里好几天了。请帮忙。
另外，可能是一个相关的问题:我的应用程序是否需要共享首选项以便它能够执行我想要的操作？从设备存储中获取的文件。
这是我的源文件的链接，这样人们就可以查明我做错了什么 https://github.com/PiersonLeo94/SOUN-WAKE
请看v1.1版本
最佳答案
像这样定义你的 list 。
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dev.hb.testing">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<receiver android:name=".LockScreenReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".WelcomeActivity" />
</application>
</manifest>
关于android - BroadcastReceiver 在设备启动后未启动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33953483/