播放音视频---MediaPlayer、VideoView
实现了简单的音视频功能。
前提条件，申请读取SD卡的权限，Android6.0及以上还要记得动态申请哦（放于文章最后）！！！
1.播放音频
功能：播放（续播）、暂停、停止。
1.布局xml：
<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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_margin="5dp"
android:id="@+id/btn_paly"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="play"/>
<Button
android:layout_margin="5dp"
android:id="@+id/btn_pause"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="pause"/>
<Button
android:layout_margin="5dp"
android:id="@+id/btn_stop"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="stop"/>
LinearLayout>
LinearLayout>
2.activity代码：
public class ActPlayMedia extends AppCompatActivity{
@BindView(R.id.btn_paly)
Button btnPaly;
@BindView(R.id.btn_pause)
Button btnPause;
@BindView(R.id.btn_stop)
Button btnStop;
private MediaPlayer mediaPlayer = new MediaPlayer();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_act_mediaplayer);
ButterKnife.bind(this);
initMediaPlayer();
}
/**
* 初始化MediaPlayer
*/
public void initMediaPlayer(){
try{
File sdDir = Environment.getExternalStorageDirectory();
File folderDir = new File(sdDir.getPath() + "/xxx");
if (!folderDir.exists()) {
folderDir.mkdir();
}
File file = new File(folderDir.getAbsolutePath(),"music.mp3");
if(file.exists()){
mediaPlayer.setDataSource(file.getPath());//指定音频文件路径
mediaPlayer.prepare();//让mediaPlayer进入准备状态
}
}catch (Exception e){
e.printStackTrace();
}
}
@OnClick({R.id.btn_paly, R.id.btn_pause, R.id.btn_stop})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.btn_paly:
if(!mediaPlayer.isPlaying()){
mediaPlayer.start();//开始播放;暂停播放后点击则继续播放
}
break;
case R.id.btn_pause:
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();//暂停播放
}
break;
case R.id.btn_stop:
if(mediaPlayer.isPlaying()){
mediaPlayer.reset();//停止播放
initMediaPlayer();
}
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(mediaPlayer != null){
mediaPlayer.stop();
mediaPlayer.reset();//释放资源
}
}
}
2.播放视频
功能：播放（续播）、暂停、重播。
1.布局xml
<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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_margin="5dp"
android:id="@+id/btn_paly"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="play"/>
<Button
android:layout_margin="5dp"
android:id="@+id/btn_pause"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="pause"/>
<Button
android:layout_margin="5dp"
android:id="@+id/btn_replay"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="replay"/>
LinearLayout>
<VideoView
android:id="@+id/video_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="5dp"/>
LinearLayout>
2.activity代码
public class ActPlayVideo extends AppCompatActivity {
@BindView(R.id.btn_paly)
Button btnPaly;
@BindView(R.id.btn_pause)
Button btnPause;
@BindView(R.id.btn_replay)
Button btnReplay;
@BindView(R.id.video_view)
VideoView videoView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_act_playvideo);
ButterKnife.bind(this);
initVideoPath();
}
public void initVideoPath(){
File sdDir = Environment.getExternalStorageDirectory();
File folderDir = new File(sdDir.getPath() + "/xxx");
if (!folderDir.exists()) {
folderDir.mkdir();
}
File file = new File(folderDir.getAbsolutePath(),"video.mp4");
if(file.exists()){
videoView.setVideoPath(file.getPath());//指定视频文件的路径
}
}
@OnClick({R.id.btn_paly, R.id.btn_pause, R.id.btn_replay})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.btn_paly:
if(!videoView.isPlaying()){
videoView.start();//开始播放
}
break;
case R.id.btn_pause:
if(videoView.isPlaying()){
videoView.pause();//暂停播放
}
break;
case R.id.btn_replay:
if(videoView.isPlaying()){
videoView.resume();//重新播放
}
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(videoView != null){
videoView.suspend();//释放资源
}
}
}
3.申请SD卡读取权限
1.配置文件申明：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />2.动态申请
private boolean hadPermission = false;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,};//SD卡读写的权限
private static final int REQUEST_EXTERNAL_STORAGE = 21;
private final static int RESULT_PERMISSION = 1001;
/**
* 请求权限
*/
public void verifyStoragePermissions() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int i = ContextCompat.checkSelfPermission(MainActivity.this, PERMISSIONS_STORAGE[0]);
int j = ContextCompat.checkSelfPermission(MainActivity.this, PERMISSIONS_STORAGE[1]);
if (i != PackageManager.PERMISSION_GRANTED || j != PackageManager.PERMISSION_GRANTED) {
//权限还没有授予，进行申请权限
startRequestPermission();
} else {
hadPermission = true;
}
} else {
hadPermission = true;
}
}
/**
* 开始提交请求权限
*/
private void startRequestPermission() {
ActivityCompat.requestPermissions(MainActivity.this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
}
/**
* 用户权限 申请 的回调方法
*
* @param requestCode
* @param permissions
* @param grantResults
*/
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_EXTERNAL_STORAGE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (grantResults.length != 0) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
// 判断用户是否点击了不再提醒。(检测该权限是否还可以申请)
boolean b = shouldShowRequestPermissionRationale(permissions[0]);
if (!b) {
} else {
}
hadPermission = false;
} else {
hadPermission = true;
}
}
}
}
}