我如何能表现出的MediaController而在Android的播放音频？ [英] How can I show a MediaController while playing audio in Android?

问题描述

我如何能表现出的MediaController 同时播放音频文件？我创建的MediaController 的实例，并调用它的显示（）方法，但它没有显示。 可以任何帮助我在设法解决这个问题？

How can I show a MediaController while playing audio file? I am creating an instance of MediaController and calling its show() method, but it is not showing. Can any help me in sorting out this issue?

推荐答案

下面是一个使用的MediaPlayer和MediaController播放音频的活动的一个例子。

Here is an example of an Activity that uses MediaPlayer and MediaController to play audio.

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

import android.media.MediaPlayer.OnPreparedListener;
import android.view.MotionEvent;
import android.widget.MediaController;
import android.widget.TextView;

import java.io.IOException;

public class AudioPlayer extends Activity implements OnPreparedListener, MediaController.MediaPlayerControl{
  private static final String TAG = "AudioPlayer";

  public static final String AUDIO_FILE_NAME = "audioFileName";

  private MediaPlayer mediaPlayer;
  private MediaController mediaController;
  private String audioFile;

  private Handler handler = new Handler();

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.audio_player);

    audioFile = this.getIntent().getStringExtra(AUDIO_FILE_NAME);
    ((TextView)findViewById(R.id.now_playing_text)).setText(audioFile);

    mediaPlayer = new MediaPlayer();
    mediaPlayer.setOnPreparedListener(this);

    mediaController = new MediaController(this);

    try {
      mediaPlayer.setDataSource(audioFile);
      mediaPlayer.prepare();
      mediaPlayer.start();
    } catch (IOException e) {
      Log.e(TAG, "Could not open file " + audioFile + " for playback.", e);
    }

  }

  @Override
  protected void onStop() {
    super.onStop();
    mediaController.hide();
    mediaPlayer.stop();
    mediaPlayer.release();
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    //the MediaController will hide after 3 seconds - tap the screen to make it appear again
    mediaController.show();
    return false;
  }

  //--MediaPlayerControl methods----------------------------------------------------
  public void start() {
    mediaPlayer.start();
  }

  public void pause() {
    mediaPlayer.pause();
  }

  public int getDuration() {
    return mediaPlayer.getDuration();
  }

  public int getCurrentPosition() {
    return mediaPlayer.getCurrentPosition();
  }

  public void seekTo(int i) {
    mediaPlayer.seekTo(i);
  }

  public boolean isPlaying() {
    return mediaPlayer.isPlaying();
  }

  public int getBufferPercentage() {
    return 0;
  }

  public boolean canPause() {
    return true;
  }

  public boolean canSeekBackward() {
    return true;
  }

  public boolean canSeekForward() {
    return true;
  }
  //--------------------------------------------------------------------------------

  public void onPrepared(MediaPlayer mediaPlayer) {
    Log.d(TAG, "onPrepared");
    mediaController.setMediaPlayer(this);
    mediaController.setAnchorView(findViewById(R.id.main_audio_view));

    handler.post(new Runnable() {
      public void run() {
        mediaController.setEnabled(true);
        mediaController.show();
      }
    });
  }
}

下面是一个可以用code以上使用的布局：

Here is a layout that can be used with the code above:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/main_audio_view"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:layout_gravity="center"
              android:orientation="vertical">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="Now playing:"
    android:textSize="25sp"
    android:textStyle="bold"
    />
  <TextView
    android:id="@+id/now_playing_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dip"
    android:layout_marginLeft="10dip"
    android:layout_marginRight="10dip"
    android:layout_gravity="center"
    android:text="Now playing.."
    android:textSize="16sp"
    android:textStyle="italic"
    />
</LinearLayout>

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