如何在 Android 中的方向改变时连续播放音频? [英] How to play audio continuously while orientation changes in Android?
问题描述
我是 Android 新手，我必须创建 MediaPlayer 来播放音频音乐.开始时，我的活动歌曲开始播放.但是当我在模拟器屏幕上改变方向时 MediaPlayer 被重新初始化并且另一个音频开始播放.我怎样才能避免它?
I'm new to Android and I have to create MediaPlayer for playing the audio music. When start my activity song starts playing. But when I change the orientation on my emulator screen MediaPlayer is reinitialized and another audio starts playing. How can I avoid it?
这是我的代码:
public class Audio_Activity extends Activity {
MediaPlayer mp = null;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if(isLaunched)
{
setContentView(R.layout.audio);
}
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
length = settings.getInt("TheOffset", 0);
init();
prefs = PreferenceManager.getDefaultSharedPreferences(this);
mp = MediaPlayer.create(getApplicationContext(), R.raw.subhanallah);
playMusic();
mp.setOnCompletionListener(new OnCompletionListener()
{
@Override
public void onCompletion(MediaPlayer arg0)
{
// TODO Auto-generated method stub
}
});
}
private void playMusic()
{
httpGetAsynchTask httpGetAsyncTask = new httpGetAsynchTask();
httpGetAsyncTask.execute();
}
class httpGetAsynchTask extends AsyncTask<String,Integer, Void>
{
protected void onPreExdcute()
{
}
@Override
protected Void doInBackground(String... arg0)
{
// TODO Auto-generated method stub
final SharedPreferences.Editor prefsEdit = prefs.edit();
Log.e("Song is playing", "in Mediya Player ");
mp.setLooping(false);
mp.start();
int millisecond=mp.getDuration();
Log.e("Song is playing", "in Mediya Player " + millisecond);
prefsEdit.putBoolean("mediaplaying", true);
prefsEdit.commit();
//btnChapter.setEnabled(false);
return null;
}
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
btnChapter.setEnabled(false);
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Configuration config=getResources().getConfiguration();
if(config.orientation == Configuration.ORIENTATION_PORTRAIT)
{
setContentView(R.layout.audio);
}
else if(config.orientation == Configuration.ORIENTATION_LANDSCAPE)
{
setContentView(R.layout.audio);
}
}
@Override
public void onPause() {
super.onPause();
SharedPreferences.Editor prefsEdit = prefs.edit();
boolean isPlaying = prefs.getBoolean("mediaplaying", false);
if (isPlaying)
{
mp.pause();
int position = mp.getCurrentPosition();
Log.e("Current ", "Position -> " + position);
prefsEdit.putInt("mediaPosition", position);
prefsEdit.commit();
}
}
@Override
protected void onResume() {
super.onResume();
mp.start();
boolean isPlaying = prefs.getBoolean("mediaplaying", false);
if (isPlaying) {
int position = prefs.getInt("mediaPosition", 0);
mp.seekTo(position);
// mp.start();
}
}
}
我对 Manifest.xml 文件做了一些更改.
And I have done some changes in Manifest.xml file.
< android:configChanges="orientation|screenSize|keyboard" >
并创建 layout-land 文件夹.
and create layout-land folder .
为什么音乐播放了两次?
Why is the music playing twice?
推荐答案
当我们将 mediaplayer 声明为静态变量时，将只存在一个 mp 实例.假设我们的活动方向现在发生了变化，一切都将在方向变化时重新创建，但由于静态属性，不会重新创建 Mp 变量.这样我们就只做了一个条件
When we declare mediaplayer as a static variable then only one instance of mp will exist. Suppose our Activity orientation changes now, Everything will be recreated on orientation change but Mp variable will not be recreated because of static property. In this way we just make a condition
if(mp!=null && !mp.isPlaying()){
mp = MediaPlayer.create(getApplicationContext(), R.raw.subhanallah);
playMusic();
}
在我们的 onCreate() 方法中，这将检查音乐是否已经在播放，如果正在播放则 if 条件将不允许应用程序再次启动音乐播放器.如果音乐未播放，则 if 条件将允许应用程序重新启动音乐.
in our onCreate() method, this will check whether music is already playing or not, if its playing then if condition will not allow application to start music player again. and if Music is not playing then if condition will allow the application to restart the music.
这是您的更新代码:
public class Audio_Activity extends Activity {
static MediaPlayer mp = null;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if(isLaunched)
{
setContentView(R.layout.audio);
}
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
length = settings.getInt("TheOffset", 0);
init();
prefs = PreferenceManager.getDefaultSharedPreferences(this);
if(mp == null)
{
initializeMP();
}
if(!mp.isPlaying())
{
playMusic();
}
mp.setOnCompletionListener(new OnCompletionListener()
{
@Override
public void onCompletion(MediaPlayer arg0)
{
// TODO Auto-generated method stub
}
});
}
private void playMusic()
{
httpGetAsynchTask httpGetAsyncTask = new httpGetAsynchTask();
httpGetAsyncTask.execute();
}
public void initializeMP()
{
mp = MediaPlayer.create(getApplicationContext(), R.raw.subhanallah);
}
class httpGetAsynchTask extends AsyncTask<String,Integer, Void>
{
protected void onPreExdcute()
{
}
@Override
protected Void doInBackground(String... arg0)
{
// TODO Auto-generated method stub
final SharedPreferences.Editor prefsEdit = prefs.edit();
Log.e("Song is playing", "in Mediya Player ");
if(mp == null)
{
initializeMP()
}
mp.setLooping(false);
mp.start();
int millisecond=mp.getDuration();
Log.e("Song is playing", "in Mediya Player " + millisecond);
prefsEdit.putBoolean("mediaplaying", true);
prefsEdit.commit();
//btnChapter.setEnabled(false);
return null;
}
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
btnChapter.setEnabled(false);
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Configuration config=getResources().getConfiguration();
if(config.orientation == Configuration.ORIENTATION_PORTRAIT)
{
setContentView(R.layout.audio);
}
else if(config.orientation == Configuration.ORIENTATION_LANDSCAPE)
{
setContentView(R.layout.audio);
}
}
@Override
public void onPause() {
super.onPause();
SharedPreferences.Editor prefsEdit = prefs.edit();
boolean isPlaying = prefs.getBoolean("mediaplaying", false);
if (isPlaying)
{
if(mp!=null)
{
mp.pause();
}
int position = mp.getCurrentPosition();
Log.e("Current ", "Position -> " + position);
prefsEdit.putInt("mediaPosition", position);
prefsEdit.commit();
}
}
@Override
protected void onResume() {
super.onResume();
if(mp == null)
{
initializeMP();
}
mp.start();
boolean isPlaying = prefs.getBoolean("mediaplaying", false);
if (isPlaying) {
int position = prefs.getInt("mediaPosition", 0);
mp.seekTo(position);
// mp.start();
}
}
}
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