播放音频

MediaPlay 播放器

示例代码

申请权限
AndroidManifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

activity_audio_player.xml

<?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"
    tools:context=".chapter08.AudioPlayerActivity"
    android:orientation="vertical">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <Button
                android:id="@+id/btn_ap_play"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="播放" />
            <Button
                android:id="@+id/btn_ap_pause"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="暂停" />

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

        </LinearLayout>
    </ScrollView>

</LinearLayout>

AudioPlayerActivity.java

public class AudioPlayerActivity extends AppCompatActivity {

    private MediaPlayer mMediaPalyer = new MediaPlayer();

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

        // 播放
        Button btn_ap_play = findViewById(R.id.btn_ap_play);
        btn_ap_play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!mMediaPalyer.isPlaying()) {
                    mMediaPalyer.start();
                }
            }
        });

        // 暂停
        Button btn_ap_pause = findViewById(R.id.btn_ap_pause);
        btn_ap_pause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mMediaPalyer.isPlaying()) {
                    mMediaPalyer.pause();
                }
            }
        });

        // 停止
        Button btn_ap_stop = findViewById(R.id.btn_ap_stop);
        btn_ap_stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mMediaPalyer.isPlaying()) {
                    mMediaPalyer.stop();
                }
            }
        });

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

    private void initMediaPlayer() {
        try {
            // 读取音频文件
            File file = new File(Environment.getExternalStorageDirectory(), "test.wav");
            // 设置音频文件
            mMediaPalyer.setDataSource(file.getPath());
            // 预编译
            mMediaPalyer.prepare();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @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,
                            "拒绝权限将无法使用程序", Toast.LENGTH_LONG).show();
                    finish();
                }
                break;
                default:
                    break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mMediaPalyer != null) {
            mMediaPalyer.stop();
            mMediaPalyer.release();
        }
    }
}