如何停止播放音乐，如果有来电或去电，请拨打OnPause？
因此，一旦有电话或拨打电话，它将通过呼叫OnPause来停止音乐。
package com.beanie.samples.streaming;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import com.beanie.samples.streaming.R;
import com.beanie.samples.streaming.MyService;
import android.app.Activity;
import android.app.IntentService;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;
;
public class HomeActivity extends Activity implements OnClickListener {
private static final String TAG = "MyServices";
private final static String RADIO_STATION_URL = "http://195.154.237.162:8936/";
private static final String START_STICKY = null;
Button buttonPlay, buttonStopPlay;
/** Called when the activity is first created.
* Keep this here all the application will stop working */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initializeUIElements();
initializeMediaPlayer();
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonPlay = (Button) findViewById(R.id.buttonPlay);
buttonStopPlay = (Button) findViewById(R.id.buttonStopPlay);
buttonPlay.setOnClickListener(this);
buttonStopPlay.setOnClickListener(this);
}
private ProgressBar playSeekBar;
private MediaPlayer player;
private InputStream recordingStream;
private RecorderThread recorderThread;
private boolean isRecording = false;
private void initializeUIElements() {
playSeekBar = (ProgressBar) findViewById(R.id.progressBar1);
playSeekBar.setMax(100);
playSeekBar.setVisibility(View.INVISIBLE);
buttonPlay = (Button) findViewById(R.id.buttonPlay);
buttonPlay.setOnClickListener(this);
buttonStopPlay = (Button) findViewById(R.id.buttonStopPlay);
buttonStopPlay.setEnabled(false);
buttonStopPlay.setOnClickListener(this);
}
public void getTelephonyOverview(final TelephonyManager telMgr)
{
int callState = telMgr.getCallState();
String callStateString = "NA";
switch (callState) {
case TelephonyManager.CALL_STATE_IDLE:
getLastCallLogEntry(Appinfo.this);
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Log.i("Call","started");
break;
case TelephonyManager.CALL_STATE_RINGING:
Log.i("Call","ringing");
break;
}
}
public void startPlaying() {
buttonStopPlay.setEnabled(true);
buttonPlay.setEnabled(false);
playSeekBar.setVisibility(View.VISIBLE);
player.prepareAsync();
player.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
player.start();
}
});
}
private void onBufferingUpdate(MediaPlayer mp, int percent) {
playSeekBar.setSecondaryProgress(percent);
Toast.makeText(this, "Buffering ", percent).show();
Log.i("Buffering", "" + percent);
}
public void onClick(View v) {
if (v == buttonPlay) {
onBufferingUpdate(player, 0);
Log.d(TAG, "onClick: starting srvice");
startPlaying();
player.setLooping(false); // Set looping
}
else if (v == buttonStopPlay) {
Log.d(TAG, "onClick: stopping srvice");
stopPlaying();
}
}
private void stopPlaying() {
if (player.isPlaying()) {
player.stop();
player.release();
initializeMediaPlayer();
}
buttonPlay.setEnabled(true);
buttonStopPlay.setEnabled(false);
playSeekBar.setVisibility(View.INVISIBLE);
stopRecording();
}
private void initializeMediaPlayer() {
player = new MediaPlayer();
try {
player.setDataSource(RADIO_STATION_URL);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void startRecording() {
BufferedOutputStream writer = null;
try {
URL url = new URL(RADIO_STATION_URL);
URLConnection connection = url.openConnection();
final String FOLDER_PATH = Environment.getExternalStorageDirectory().getAbsolutePath()
+ File.separator + "Songs";
File folder = new File(FOLDER_PATH);
if (!folder.exists()) {
folder.mkdir();
}
writer = new BufferedOutputStream(new FileOutputStream(new File(FOLDER_PATH
+ File.separator + "sample.mp3")));
recordingStream = connection.getInputStream();
final int BUFFER_SIZE = 100;
byte[] buffer = new byte[BUFFER_SIZE];
while (recordingStream.read(buffer, 0, BUFFER_SIZE) != -1 && isRecording) {
writer.write(buffer, 0, BUFFER_SIZE);
writer.flush();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
recordingStream.close();
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void stopRecording() {
try {
isRecording = false;
if (recordingStream != null) {
recordingStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
private class RecorderThread extends Thread {
@Override
public void run() {
isRecording = true;
startRecording();
}
};
}
答案 0 :(得分：1)
如何停止播放音乐，请调用OnPause
onPause()和onStop()是将自动调用的生命周期方法;你不要手动打电话。你应该覆盖它们并添加阻止音乐的代码。
答案 1 :(得分：0)
您不需要在生命周期方法中执行任何操作来停止音乐。 Android为您提供了处理这些案例的机制。
该机制称为Audio Focus。应用程序在想要播放音频（或视频！）时请求音频焦点。当另一个应用程序需要音频时，它会请求音频焦点。订阅方收到广播说：嘿，你已经失去了音频焦点。如果焦点只是暂时丢失（就像通知到来并播放一个短暂的音频哔哔声）那么广播说：嘿，你已经失去了音频焦点但是放弃了音频，我马上就会把它还给你。 在这种情况下的想法是你将你的音量降低（低）到0.1（例如）让另一个声音（嘟嘟声）响亮。
在通知发出“嘟嘟”声之后，广播说：嘿，这是你之前的音频焦点。
此时如果你还在玩，你可以将音量恢复到以前的状态。
这是音频焦点背后的概念。它在Android Docs（以及Android Samples）中得到了完美的解释，尽管Google代码相当混乱且不一致，但它确实可以开箱即用。他们做了很多糟糕的抽象和一些奇怪的代码实践，但不管怎样，代码工作得很好。
同样适用于电话，您订阅并告诉您的服务在正在进行通话时暂停/恢复声音。不是当你的应用程序进入后台（暂停）时，因为它不可靠，并不意味着你的应用程序进入后台。