Android 无法从接收器停止MediaPlayer
你好,我想用BroadcastReceiver制作一个当充电状态超过90%时会响的应用程序。我决定首先制作一个应用程序,当Intent.ACTION\u充电器连接且Intent.ACTION\u断开时,它将播放铃声。应用程序将启动铃声,充电器断开连接后将停止铃声 我尝试使用stop()方法停止它 我也试过类似的方法Android 无法从接收器停止MediaPlayer,android,broadcastreceiver,android-mediaplayer,Android,Broadcastreceiver,Android Mediaplayer,你好,我想用BroadcastReceiver制作一个当充电状态超过90%时会响的应用程序。我决定首先制作一个应用程序,当Intent.ACTION\u充电器连接且Intent.ACTION\u断开时,它将播放铃声。应用程序将启动铃声,充电器断开连接后将停止铃声 我尝试使用stop()方法停止它 我也试过类似的方法 mp.reset(); mp.prepare(); mp.stop(); mp.release(); mp = null; 当然是在试抓挡 这里我有代码,你可以理解我在做
mp.reset();
mp.prepare();
mp.stop();
mp.release();
mp = null;
当然是在试抓挡
这里我有代码,你可以理解我在做什么
MainActivity.java
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
private CustomReciever mReciever = new CustomReciever();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// intent filetr provide action that a app can get or want to get or listening for broadcast .
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_POWER_CONNECTED);
filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
// here we are registering our receiver
this.registerReceiver(mReciever, filter);
}
@Override
protected void onDestroy() {
// here we are unregistering our receiver
unregisterReceiver(mReciever);
super.onDestroy();
}
}
顾客接受者
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Toast;
public class CustomReciever extends BroadcastReceiver {
MediaPlayer mp;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action != null) {
String toast = "action is unknown";
// initializing media player
mp = MediaPlayer.create(context, R.raw.full_charge);
switch (action) {
case Intent.ACTION_POWER_CONNECTED: {
toast = "power is connected";
startMP(context);
}
break;
case Intent.ACTION_POWER_DISCONNECTED: {
toast = "power is disconnected";
stopMP(context);
}
break;
}
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
}
}
private void startMP(final Context context){
if(mp == null){
mp = MediaPlayer.create( context, R.raw.full_charge);
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
stopMP(context);
}
});
}
mp.start();
mp.setLooping(true);
}
private void stopMP(Context context) {
if(mp != null) {
mp.release();
mp = null;
Toast.makeText(context , "song is stopped " , Toast.LENGTH_SHORT).show();
}
}
}
每次接收都要创建Mediaplayer对象,请尝试更新代码
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action != null) {
String toast = "action is unknown";
switch (action) {
case Intent.ACTION_POWER_CONNECTED: {
toast = "power is connected";
// initializing media player
mp = MediaPlayer.create(context, R.raw.full_charge);
startMP(context);
}
break;
case Intent.ACTION_POWER_DISCONNECTED: {
toast = "power is disconnected";
if(mp!=null)
stopMP(context);
}
break;
}
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
}
}
在CustomReceiver代码中,在第一种情况下创建MediaPlayer对象
案例意图.行动\电源\连接:
` @Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action != null) {
String toast = "action is unknown";
switch (action) {
case Intent.ACTION_POWER_CONNECTED: {
// initializing media player
mp = MediaPlayer.create(context, R.raw.full_charge);
toast = "power is connected";
startMP(context);
}
break;
case Intent.ACTION_POWER_DISCONNECTED: {
toast = "power is disconnected";
stopMP(context);
}
break;
}
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
}
}`
其他代码与前一个代码相同。完美输出。断开电源后,音乐自动关闭。谢谢您的回答。两个答案都有效,解决了我的问题。我已经创建了一个函数startMP(),它基本上创建了MediaPlayer对象,我试图删除mp=MediaPlayer.create(context,R.raw.full_charge);第一种情况下的行和代码工作正常。现在它只依赖于startMP()函数。我知道你们两个都看过我的代码,所以我需要编写mp=MediaPlayer.create(context,R.raw.full_charge)行的代码;它是否会对应用程序性能或类似性能产生重大影响。先谢谢你。