android基础---->音频和视频的使用

　　Android 在播放音频和视频方面也是做了相当不错的支持，它提供了一套较为完整的API，使得开发者可以很轻松地编写出一个简易的音频或视频播放器。今天我们开始android中音频和视频使用的学习。

目录导航

1. 音频的播放
2. 视频的播放
3. 友情链接

音频的播放

项目结构如下：一个简单的读取sd卡上的音频或者视频资源的应用

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" alt="" />

在Android 中播放音频文件一般都是使用MediaPlayer 类来实现的，它对多种格式的音频文件提供了非常全面的控制方法，从而使得播放音乐的工作变得十分简单。

一、 初始化音频的播放，调用MediaPlayer的setDataSource方法，可以接收音频文件的绝对路径，也可以是http或者rtsp的url：

private final static String TAG = "MainActivity";
private MediaPlayer mediaPlayer = new MediaPlayer();

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

private void initMediaPlayer() {
    Log.i(TAG, "init media player");
    try {
        File file = new File(Environment.getExternalStorageDirectory(), "test.mp3");
        mediaPlayer.setDataSource(file.getPath()); // 指定音频文件的路径
        mediaPlayer.prepare(); // 让MediaPlayer进入到准备状态
    } catch (Exception e) {
        e.printStackTrace();
    }
}

涉及到读取sd卡文件的权限：

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

二、 对音频的一系列操作：

// 播放音频
public void playMusic(View view) {
    if (!mediaPlayer.isPlaying()) {
        mediaPlayer.start(); // 开始播放
    }
}

// 暂停音频
public void pauseMusic(View view) {
    if (mediaPlayer.isPlaying()) {
        mediaPlayer.pause(); // 暂停播放
    }
}

// 停止音频
public void stopMusic(View view) {
    if (mediaPlayer.isPlaying()) {
        mediaPlayer.reset(); // 停止播放
        initMediaPlayer();
    }

三、 在ondestroy方法中释放资源：

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

四、 layout文件activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <VideoView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="playVideo"
            android:text="PlayVideo" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="pauseVideo"
            android:text="PauseVideo" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="replyVideo"
            android:text="ReplayVideo" />
    </LinearLayout>
</LinearLayout>

视频的播放

一、 初始化视频的播放：

private VideoView videoView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_play_video);
    videoView = (VideoView) findViewById(R.id.video_view);
    initVideoPath();
}

// 初始化播放文件
private void initVideoPath() {
    File file = new File(Environment.getExternalStorageDirectory(), "test.mp4");
    videoView.setVideoPath(file.getPath()); // 指定视频文件的路径
}

二、 视频的一系列的操作：

// 播放视频
public void playVideo(View view) {
    if (!videoView.isPlaying()) {
        videoView.start(); // 开始播放
    }
}

//暂停视频
public void pauseVideo(View view) {
    if (videoView.isPlaying()) {
        videoView.pause(); // 暂时播放
    }
}

//重新播放视频
public void replyVideo(View view) {
    if (videoView.isPlaying()) {
        videoView.resume(); // 重新播放
    }
}

三、 在ondestroy方法中释放资源：

@Override
protected void onDestroy() {
    super.onDestroy();
    if (videoView != null) {
        videoView.suspend();
    }
}

四、 视频的layout的文件：activity_play_video.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <VideoView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="playVideo"
            android:text="PlayVideo" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="pauseVideo"
            android:text="PauseVideo" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="replyVideo"
            android:text="ReplayVideo" />
    </LinearLayout>
</LinearLayout>

友情链接