Question

public class StreamingMp3Player extends Activity implements OnClickListener,          OnTouchListener, OnCompletionListener, OnBufferingUpdateListener{

private ImageButton buttonPlayPause;
private SeekBar seekBarProgress;
public EditText editTextSongURL;

private MediaPlayer mediaPlayer;
private int mediaFileLengthInMilliseconds; 

private final Handler handler = new Handler();

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    initView();
}

/** This method initialise all the views in project*/
private void initView() {
    buttonPlayPause = (ImageButton)findViewById(R.id.ButtonTestPlayPause);
    buttonPlayPause.setOnClickListener(this);

    seekBarProgress = (SeekBar)findViewById(R.id.SeekBarTestPlay);  
    seekBarProgress.setMax(99); // It means 100% .0-99
    seekBarProgress.setOnTouchListener(this);
    editTextSongURL = (EditText)findViewById(R.id.EditTextSongURL);
    editTextSongURL.setText(R.string.testsong_20_sec);

    mediaPlayer = new MediaPlayer();
    mediaPlayer.setOnBufferingUpdateListener(this);
    mediaPlayer.setOnCompletionListener(this);
}

private void primarySeekBarProgressUpdater() {
    seekBarProgress.setProgress((int)(((float)mediaPlayer.getCurrentPosition()/   mediaFileLengthInMilliseconds)*100)); // This math construction give a percentage of "was playing"/"song length"
    if (mediaPlayer.isPlaying()) {
        Runnable notification = new Runnable() {
            public void run() {
                primarySeekBarProgressUpdater();
            }
        };
        handler.postDelayed(notification,1000);
    }
}

@Override
public void onClick(View v) {
    if(v.getId() == R.id.ButtonTestPlayPause){
         /** ImageButton onClick event handler. Method which start/pause mediaplayer playing */
        try {
            mediaPlayer.setDataSource(editTextSongURL.getText().toString()); // setup song from http://www.hrupin.com/wp-content/uploads/mp3/testsong_20_sec.mp3 URL to mediaplayer data source
            mediaPlayer.prepare(); // you must call this method after setup the datasource in setDataSource method. After calling prepare() the instance of MediaPlayer starts load data from URL to internal buffer. 
        } catch (Exception e) {
            e.printStackTrace();
        }

        mediaFileLengthInMilliseconds = mediaPlayer.getDuration(); // gets the song length in milliseconds from URL

        if(!mediaPlayer.isPlaying()){
            mediaPlayer.start();
            buttonPlayPause.setImageResource(R.drawable.button_pause);
        }else {
            mediaPlayer.pause();
            buttonPlayPause.setImageResource(R.drawable.button_play);
        }

        primarySeekBarProgressUpdater();
    }
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    if(v.getId() == R.id.SeekBarTestPlay){
        /** Seekbar onTouch event handler. Method which seeks MediaPlayer to seekBar primary progress position*/
        if(mediaPlayer.isPlaying()){
            SeekBar sb = (SeekBar)v;
            int playPositionInMillisecconds = (mediaFileLengthInMilliseconds / 100) * sb.getProgress();
            mediaPlayer.seekTo(playPositionInMillisecconds);
        }
    }
    return false;
}

@Override
public void onCompletion(MediaPlayer mp) {
     /** MediaPlayer onCompletion event handler. Method which calls then song   playing is complete*/
    buttonPlayPause.setImageResource(R.drawable.button_play);
}

@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
    /** Method which updates the SeekBar secondary progress by current song   loading from URL position*/
    seekBarProgress.setSecondaryProgress(percent);
}
}

现在这段代码播放mp3当我点击“buttonPlayPause”图片按钮。但是当我打开这个活动时，我需要自动启动这个播放按钮...这可能吗？

我的布局

<TextView 
    android:text="Song Titile" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/SongTitle"/>   

<TextView 
    android:layout_below="@+id/SongTitle"
    android:text="The song URL" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/SongUrl"/> 
<ImageButton 
    android:layout_below="@+id/SongUrl"
    android:id="@+id/ButtonTestPlayPause" 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent"
    android:src="@drawable/button_play"/>


<SeekBar 
    android:layout_below="@+id/ButtonTestPlayPause"
    android:id="@+id/SeekBarTestPlay" 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent"
    android:thumb="@drawable/thumb_transparent"/>
</RelativeLayout>

我从另一个活动传递网址...我需要，如果我打开此活动开始并自动播放MP3 ..不要点击播放按钮

Answer 1

在方法中移动onClick()的逻辑，并从onClick和onCreate调用此方法

private void myMethod() {
  // logic here
}


@Override
public void onClick(View v) {
    if(v.getId() == R.id.ButtonTestPlayPause){
          myMethod();
    }

 }



   @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    initView();
    myMethod();
}

Answer 2

您也可以在onCreate语句中执行：

Button button = findViewById(R.id.ButtonTestPlayPause);
button.performClick();

Answer 3



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    initView();
    play();
}

并在你的onclick（）中：



if(v.getId() == R.id.ButtonTestPlayPause){
play();

}

并且在游戏方法中使用：



public void play(){
try {
            mediaPlayer.setDataSource(editTextSongURL.getText().toString());data source
            mediaPlayer.prepare(); 
        } catch (Exception e) {
            e.printStackTrace();
        }
}

android自动在打开活动时启动onClick

3 个答案: