Android 播放音频

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字数统计: 509 word | 阅读时长 ≈ 2 min
思路

播放音频一般使用MediaPlayer类实现：

  • setDataSource()：选择要播放的音频文件
  • prepare()：开始播放前调用这个完成准备工作
  • start()：开始或继续播放音频

  • pause()：暂停播放

  • setDataSource()：选择要播放的音频文件

  • prepare()：开始播放前调用这个完成准备工作
  • start()：开始或继续播放音频

  • pause()：暂停播放

  • isPlaying()：判断当前播放状态

  • getDuration()：获取音频时长
Demo Code:
主布局
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/play"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="播放" />

    <Button
        android:id="@+id/pause"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="暂停" />

    <Button
        android:id="@+id/stop"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="停止" />

</LinearLayout>
主活动
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public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private MediaPlayer mediaPlayer;
    private Button play;
    private Button pause;
    private Button stop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mediaPlayer = new MediaPlayer();

        play = findViewById(R.id.play);
        pause = findViewById(R.id.pause);
        stop = findViewById(R.id.stop);

        play.setOnClickListener(this);
        pause.setOnClickListener(this);
        stop.setOnClickListener(this);

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        } else {
            initMediaPlayer();
        }
    }

    //初始化播放器
    private void initMediaPlayer() {
        File file = new File(Environment.getExternalStorageDirectory() + "/Download/", "园游会.mp3");
        try {
            mediaPlayer.setDataSource(file.getPath());
            mediaPlayer.prepare();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.play:
                if (!mediaPlayer.isPlaying()) { //如果没有在播放
                    mediaPlayer.start();
                }
                break;
            case R.id.pause:
                if (mediaPlayer.isPlaying()) { //如果正在播放
                    mediaPlayer.pause();
                }
                break;
            case R.id.stop:
                mediaPlayer.reset();
                initMediaPlayer();
                break;
        }
    }

    //申请权限回调函数
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    initMediaPlayer();
                } else {
                    Toast.makeText(this, "没有权限", Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
        }
    }

    //结束时 释放资源
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null) {
            mediaPlayer.stop();
            mediaPlayer.release();
        }
    }
}
添加权限
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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