本文為自定義的視頻播放器,可進行屏幕切換(由于換屏時大小變化,電腦截圖就分開截圖了),效果如下圖:

--------------播放視頻概括:

SurfaceView+MediaPlayer以及 VideoView 2種方式

SurfaceVIew中有個SurfaceHolder，通過surfaceView.getHolder( )方法獲取，如果需要兼容2.3系統，還要再加上setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);否則只有聲音沒有圖像。有3個生命周期 surfaceCreated、surfaceChanged、surfaceDestroyed。

讀取raw目錄下的2個方法

Uri.parse("android.resource://"+ getPackageName()+ "/" + R.raw.video));

AssetFileDescriptorafd = getResources().openRawResourceFd(

???????????????????? ?R.raw.por);

???????????????????? ?mp_test.setDataSource(afd.getFileDescriptor(),

???????????????????? ?afd.getStartOffset(), afd.getLength());

???????????????????? ?afd.close();

設置app主題無title? ??

@android:style/Theme.Light.NoTitleBar

屏蔽變化引起的activity重啟

android:configChanges="keyboard|orientation|screenSize"

設置屏幕常亮

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

設置activity方向為縱向

android:screenOrientation="portrait"

獲得當前屏幕是橫屏還是豎屏

getResources().getConfiguration().orientation

手動切換橫豎屏

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

監聽橫豎屏切換的動作

onConfigurationChanged

代碼隱藏title

requestWindowFeature(Window.FEATURE_NO_TITLE);（必須在setcontent之前）

代碼請求全屏模式

getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

代碼清除全屏模式

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

?

適配不同的video尺寸達到不拉伸視頻的效果

setVideoParms 方法，根據視頻的比例和顯示區域的比例計算得來

?

在一套布局里寫2套控件，適配橫豎屏

適當利用LinearLayout的weight屬性做適配

使用audioManager獲取，調節系統系統音量

seekBar的初始化，改變時的監聽

系統音量改變時會發出broadcast

android.media.VOLUME_CHANGED_ACTION監聽系統音量變化

seekBar監聽時注意是否fromUser，mediaPlayer注意try

當前activity?add的flag，當activity離開時就會clear掉

-------------項目代碼VideoActivity類:

/*** 播放視頻頁面** @author hasee**/ public class VideoActivity extends Activity implements OnPreparedListener,OnSeekBarChangeListener {private MediaPlayer mediaPlayer;private SurfaceView sv_video;private RelativeLayout rl_top;private Button bt_start_or_pause;// 播放或暫停按鈕private SeekBar sb_progress;// 視頻進度條ImageView mChangeSceen;ImageView mCenterPause;LinearLayout mllmenu;LinearLayout mlltitle;private SeekBar sb_vol;// 音量進度條private AudioManager am;private int currentPosition;// 記錄當前進度值@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 雙緩沖setContentView(R.layout.activity_video);initView();initData();}private void initView() {sv_video = (SurfaceView) findViewById(R.id.sv_video);bt_start_or_pause = (Button) findViewById(R.id.bt_start_or_pause);rl_top = (RelativeLayout) findViewById(R.id.rl_top);sb_progress = (SeekBar) findViewById(R.id.sb_progress);sb_vol = (SeekBar) findViewById(R.id.sb_vol);mChangeSceen= (ImageView) findViewById(R.id.bt_change);mCenterPause= (ImageView) findViewById(R.id.video_center_pause);mllmenu= (LinearLayout) findViewById(R.id.video_menu);mlltitle= (LinearLayout) findViewById(R.id.video_menu_title);// sv_video.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//// 兼容2.3及以下版本，否則只有聲音沒有畫面sv_video.getHolder().addCallback(new Callback() {@Overridepublic void surfaceCreated(SurfaceHolder holder) {// 當頁面可見時候playVideo();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// 當頁面不可見時候stopVideo();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format,int width, int height) {}});}private void initData() {registerReceiver(volReceiver, new IntentFilter("android.media.VOLUME_CHANGED_ACTION"));am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);// 保持屏幕常亮getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);sb_vol.setMax(am.getStreamMaxVolume(AudioManager.STREAM_MUSIC));sb_vol.setProgress(am.getStreamVolume(AudioManager.STREAM_MUSIC));sb_progress.setOnSeekBarChangeListener(this);sb_vol.setOnSeekBarChangeListener(this);}private void playVideo() {mediaPlayer = new MediaPlayer();try {// 獲取RAW目錄下的文件// AssetFileDescriptor afd = getResources().openRawResourceFd(// R.raw.por);// mediaPlayer.setDataSource(afd.getFileDescriptor(), 0,// afd.getLength());// 獲取RAW目錄下的文件mediaPlayer.setDataSource(this, Uri.parse("android.resource://" + getPackageName() + "/"+ R.raw.test));mediaPlayer.setLooping(true);mediaPlayer.setOnPreparedListener(this);mediaPlayer.setDisplay(sv_video.getHolder());mediaPlayer.prepareAsync();} catch (Exception e) {e.printStackTrace();}}private void stopVideo() {canProgress = false;if (mediaPlayer != null && mediaPlayer.isPlaying()) {try {currentPosition = mediaPlayer.getCurrentPosition();mediaPlayer.pause();mediaPlayer.stop();mediaPlayer.release();mediaPlayer = null;} catch (Exception e) {}}}@Overridepublic void onPrepared(MediaPlayer mp) {// 說明mediaPlayer準備好了try {sb_progress.setMax(mp.getDuration());setParam(mp, isLand());mp.start();if (currentPosition > 0) {mp.seekTo(currentPosition);currentPosition = 0;}startProgress();} catch (Exception e) {}}/*** 判斷當前是否橫屏** @return*/private boolean isLand() {if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {return false;} else {return true;}}@Overridepublic void onConfigurationChanged(Configuration newConfig) {super.onConfigurationChanged(newConfig);if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {Log.e("pid", "豎屏了");setParam(mediaPlayer, false);getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {Log.e("pid", "橫屏了");// 去除狀態欄getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);setParam(mediaPlayer, true);}}/*** 設置視頻尺寸，達到不被拉伸的效果** @param mp* @param isLand*/private void setParam(MediaPlayer mp, boolean isLand) {float screenWidth = getWindowManager().getDefaultDisplay().getWidth();float screenHeight = screenWidth / 16f * 9f;if (isLand) {screenHeight = getWindowManager().getDefaultDisplay().getHeight();}float videoWdith = mp.getVideoWidth();float videoHeight = mp.getVideoHeight();float screenPor = screenWidth / screenHeight;// 16:9float videoPor = videoWdith / videoHeight;// 9:16ViewGroup.LayoutParams pa = sv_video.getLayoutParams();if (videoPor <= screenPor) {pa.height = (int) screenHeight;pa.width = (int) (screenHeight * videoPor);} else {pa.width = (int) screenWidth;pa.height = (int) (screenWidth / videoPor);}ViewGroup.LayoutParams rl_pa = rl_top.getLayoutParams();rl_pa.width = pa.width;rl_pa.height = pa.height;rl_top.setLayoutParams(rl_pa);sv_video.setLayoutParams(pa);}private boolean canProgress = true;private void startProgress() {canProgress = true;new Thread() {public void run() {while (canProgress) {try {sleep(500);sb_progress.setProgress(mediaPlayer.getCurrentPosition());} catch (Exception e) {}}};}.start();}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(volReceiver);}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {if (!fromUser)return;switch (seekBar.getId()) {case R.id.sb_progress:try {if (mediaPlayer != null) {mediaPlayer.seekTo(progress);}} catch (Exception e) {}break;case R.id.sb_vol:am.setStreamVolume(AudioManager.STREAM_MUSIC, progress,AudioManager.FLAG_SHOW_UI);break;}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}/*** 系統音量改變時的廣播接收者*/private BroadcastReceiver volReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {sb_vol.setProgress(am.getStreamVolume(AudioManager.STREAM_MUSIC));}};public void onClick(View v) {switch (v.getId()) {case R.id.bt_start_or_pause:try {if (bt_start_or_pause.getText().equals("播放")) {// 當前是播放，那么暫停mediaPlayer.pause();// canProgress = false;bt_start_or_pause.setText("暫停");mCenterPause.setVisibility(View.VISIBLE);} else if (bt_start_or_pause.getText().equals("暫停")) {// 當前是暫停，那么播放mediaPlayer.start();// canProgress = true;bt_start_or_pause.setText("播放");mCenterPause.setVisibility(View.GONE);}} catch (Exception e) {}break;case R.id.bt_change:// 點擊了橫豎屏切換，拿到當前屏幕方向if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {// 當前是豎屏，切換成橫屏setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);} else {// 當前是橫屏，切換成豎屏setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}break;case R.id.video_center_pause:try {if (bt_start_or_pause.getText().equals("播放")) {// 當前是播放，那么暫停mediaPlayer.pause();// canProgress = false;bt_start_or_pause.setText("暫停");} else if (bt_start_or_pause.getText().equals("暫停")) {// 當前是暫停，那么播放mediaPlayer.start();// canProgress = true;bt_start_or_pause.setText("播放");}} catch (Exception e) {}mCenterPause.setVisibility(View.GONE);break;}}/** 定時隱藏 */private Handler mDismissHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {mllmenu.setVisibility(View.GONE);mlltitle.setVisibility(View.GONE); //標題欄的自動隱藏}};@Overridepublic boolean onTouchEvent(MotionEvent event) {if (event.getAction()==MotionEvent.ACTION_DOWN){mllmenu.setVisibility(View.VISIBLE);mlltitle.setVisibility(View.VISIBLE); //標題欄的顯示}mDismissHandler.sendEmptyMessageDelayed(0,3000);return super.onTouchEvent(event);} }-----------------------activity_video.xml布局:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#fff"><RelativeLayoutandroid:id="@+id/rl_top"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#000" ><LinearLayoutandroid:id="@+id/video_menu_title"android:layout_width="match_parent"android:layout_height="50dp"android:visibility="gone"android:background="#000"><TextViewandroid:textColor="#fff"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:text="視頻標題"/></LinearLayout><SurfaceViewandroid:id="@+id/sv_video"android:layout_below="@+id/video_menu_title"android:layout_width="match_parent"android:layout_height="300dip"android:layout_centerInParent="true" /><ImageViewandroid:id="@+id/video_center_pause"android:onClick="onClick"android:layout_width="100dp"android:layout_height="100dp"android:layout_centerInParent="true"android:visibility="gone"android:src="@drawable/video_pause"/><LinearLayoutandroid:id="@+id/video_menu"android:layout_width="match_parent"android:layout_height="50dp"android:background="#000"android:visibility="gone"android:orientation="horizontal"android:layout_alignParentBottom="true"><Buttonandroid:id="@+id/bt_start_or_pause"android:layout_width="60dp"android:layout_height="50dp"android:text="播放"android:onClick="onClick"/><SeekBarandroid:id="@+id/sb_progress"android:layout_width="0dip"android:layout_height="50dip"android:layout_weight="3"android:indeterminate="false"/><SeekBarandroid:id="@+id/sb_vol"android:layout_width="0dip"android:layout_height="50dip"android:layout_weight="1" /><ImageViewandroid:id="@+id/bt_change"android:layout_width="40dp"android:layout_height="40dp"android:onClick="onClick"android:src="@drawable/changescreen"/></LinearLayout></RelativeLayout></RelativeLayout>

注意在androidmanifest清單文件對activity中添加:

<span style="font-size:18px;"> android:configChanges="keyboard|orientation|screenSize"</span>
在res文件中建立raw文件夾,然后粘貼進去test.MP4文件播放.

由于谷歌已經停止對eclipse的版本更新,我使用Android studio軟件開發,項目注意點圖片:

Mainactivity類并沒有什么代碼,主要提供開發者一個自己項目頁面,然后在里面用Intent跳轉到VideoActivity.class就可以了,想要項目給我留言.

總結:

視頻播放的注意點:

子線程里去更改視頻進度條

注意try Catch對MediaPlayer進行操作的地方(包括自定義相機中的Camera也是)

記得SurFaceView的三個生命周期方法,每次最小化以后,回來再播放,都已經不是同一個Holder了

獲取視頻寬高比例和屏幕寬高比例進行比較,隨后就可以根據屏幕的寬或者高來確定怎么拉伸視頻不會導致變形

MediaPlayer的釋放:

先暫停

再停止

再釋放

再置空

這樣最安全

涉及到屏幕翻轉的生命周期問題

要在AndroidManifest.xml中對視頻的Activity做相應配置

使用廣播來監聽對應的音量變化,因為有時候我們是用音量鍵或者在設置里更改音量

AssetFileDescriptor可以用來讀取raw下文件的類

2,mediaPlayer的native機制：

a.?? 因為mediaPlayer中的很多方法如isPlaying()方法都是JNI機制寫的，因此它的GC回收機制和平常的方法不一樣。因此，很容易會出現非法堆棧異常等情況，因此最好加上一個tryCatch進行處理。

b.?? 內部都是native方法，這種native方法，在不一定的情況下，GC會進行回收，因此不知道什么時候調用就會跳出來一個IllegalStateException異常

總結

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