如何连续播放音频时的方向在Android中的变化？ [英] How to play audio continuously while orientation changes in Android?
问题描述
我是新的Android和我要创建的MediaPlayer 用于播放音频音乐。当开始我的活动歌曲开始播放。但是，当我改变方向我模拟器的屏幕上的MediaPlayer 将重新初始化，另一个声音开始播放。我怎样才能避免呢？谁能帮我。这是我的code。
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? Can anyone help me. Here is my code.
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();
}
}
}
和我已经做在Manifest.xml文件的一些变化。
And I have done some changes in Manifest.xml file.
< android:configChanges="orientation|screenSize|keyboard" >
和创建布局土地文件夹。
and create layout-land folder .
是否有任何人知道为什么音乐播放两次。
Does any one know why music is playing twice.
推荐答案
当我们宣布媒体播放器作为一个静态变量，然后使用MP只有一个实例将存在。因为静态属性假设我们的活动方向变化，现在，一切都将在方向变化，但熔点变量来重新将不会被重建。这样，我们只需打个条件
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，这将检查音乐是否已经打与否，如果打那么如果条件不允许应用程序再次启动音乐播放器。如果音乐是不打那么如果条件允许的应用程序重新启动的音乐。
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.
下面是你更新code：
Here is your update code:
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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