ImageView显示视频的第一帧图片VideoView视频播放

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ImageView显示视频的第一帧图片&&VideoView视频播放

我们在播放视频时，为了增强用户体验，在视频未播放时，需要显示视频的第一帧图片，增强用户体验。

效果如图：

在android中系统提供了一个类MediaMetadataRetriever，可以帮我们获取视频的第一帧数据，当然，其他帧图片也是可以获取的。下面来看具体代码：

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/activity_main"android:layout_width="match_parent"android:layout_height="200dp"android:orientation="vertical"><ImageView
        android:id="@+id/image"android:scaleType="fitXY"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"/><VideoView
        android:id="@+id/video"android:visibility="gone"android:layout_width="match_parent"android:layout_height="wrap_content"/><FrameLayout
        android:id="@+id/control"android:layout_width="match_parent"android:layout_height="match_parent"><ImageView
            android:layout_gravity="center"android:id="@+id/player"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/play"/></FrameLayout></FrameLayout>

具体代码：

public class MainActivity extends Activity {private ImageView mImage;private VideoView mVideo;private FrameLayout mControl;private ImageView mPlayer;private String mPlayerPath;private final int PLAY = 0;private final int PAUSE = 1;private final int COMPLETE = 2;private int state;private boolean isFirst = true;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mImage = (ImageView) findViewById(R.id.image);mVideo = (VideoView) findViewById(R.id.video);mControl = (FrameLayout) findViewById(R.id.control);mPlayer = (ImageView) findViewById(R.id.player);mControl.setBackgroundColor(0x66000000);mPlayer.setVisibility(View.VISIBLE);mPlayerPath = Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/VID_20161103_113849.mp4";initImage();initListener();}private void initImage() {mVideo.setVisibility(View.GONE);mImage.setVisibility(View.VISIBLE);/*** MediaMetadataRetriever class provides a unified interface for retrieving* frame and meta data from an input media file.*/MediaMetadataRetriever mmr = new MediaMetadataRetriever();mmr.setDataSource(mPlayerPath);Bitmap bitmap = mmr.getFrameAtTime();//获取第一帧图片mImage.setImageBitmap(bitmap);mmr.release();//释放资源}private void initListener() {mControl.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (isFirst) {initVideo();isFirst = false;} else {if (mVideo.isPlaying()) {mVideo.pause();state = PAUSE;mControl.setBackgroundColor(0x66000000);mPlayer.setVisibility(View.VISIBLE);} else if (state != COMPLETE) {mVideo.start();state = PLAY;mControl.setBackgroundColor(Color.TRANSPARENT);mPlayer.setVisibility(View.GONE);} else {mVideo.resume();//从新开始播放state = PLAY;mControl.setBackgroundColor(Color.TRANSPARENT);mPlayer.setVisibility(View.GONE);}}}});}private void initVideo() {mVideo.setVisibility(View.VISIBLE);mImage.setVisibility(View.GONE);mVideo.setVideoPath(mPlayerPath);mVideo.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {@Overridepublic void onPrepared(MediaPlayer mp) {mVideo.start();state = PLAY;mControl.setBackgroundColor(Color.TRANSPARENT);mPlayer.setVisibility(View.GONE);}});mVideo.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {state = COMPLETE;mControl.setBackgroundColor(0x66000000);mPlayer.setVisibility(View.VISIBLE);}});}
}