MainActivity如下
package cn.testmediametadataretriever;import java.io.File;import java.io.FileOutputStream;import android.media.MediaMetadataRetriever;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;/** * Demo描述: * 利用MediaMetadataRetriever按照時間截取視頻 * 並轉換為Bitmap存放於SDCard * * 特別注意: * getFrameAtTime()方法第一個參數的單位是微秒 (us) * */public class MainActivity extends Activity { private Button mButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init(){mButton=(Button) findViewById(R.id.button);mButton.setOnClickListener(new ClickListenerImpl());}private class ClickListenerImpl implements OnClickListener{@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.button:getBitmapsFromVideo();default:break;}}}public void getBitmapsFromVideo() {String dataPath = Environment.getExternalStorageDirectory()+ "/testVideo.mp4";MediaMetadataRetriever retriever = new MediaMetadataRetriever();retriever.setDataSource(dataPath);// 取得視頻的長度(單位為毫秒)String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);// 取得視頻的長度(單位為秒)int seconds = Integer.valueOf(time) / 1000;// 得到每一秒時刻的bitmap比如第一秒,第二秒for (int i = 1; i <= seconds; i++) {Bitmap bitmap = retriever.getFrameAtTime(i*1000*1000,MediaMetadataRetriever.OPTION_CLOSEST_SYNC);String path = Environment.getExternalStorageDirectory()+ File.separator + i + ".jpg";FileOutputStream fos = null;try {fos = new FileOutputStream(path);bitmap.compress(CompressFormat.JPEG, 80, fos);fos.close();} catch (Exception e) {e.printStackTrace();}}}}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="擷取視頻的幀圖片" android:layout_centerInParent="true" /></RelativeLayout>