使用VideoView实现简单视频播放器

转载请注明出处：http://blog.csdn.net/hejjunlin/article/details/39471397

VideoView内部封装好了Mediaplayer.Android框架提供了VideoView类来封装MediaPalyer，这个VideoView类非常好用。Android自带的程序Gallery也是用VideoView实现的。相比之下，我们使用更方便 ，实现MediaPlayer.OnCompletionListener接口，将会在Video播完的时候得到通知，本例只是简单的结束程序如下：

另附我的一个还未成熟的播放器，下载地址：http://www.eoemarket.com/soft/370334.html，正在完善中

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.Display;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ImageView;

public class VideoPlayerActivity extends Activity implements OnCompletionListener {

	private String mPath;
	private String mTitle;
	private VideoView mVideoView;
	private View mVolumeBrightnessLayout;
	private ImageView mOperationBg;
	private ImageView mOperationPercent;
	private AudioManager mAudioManager;
	/** 最大声音 */
	private int mMaxVolume;
	/** 当前声音 */
	private int mVolume = -1;
	/** 当前亮度 */
	private float mBrightness = -1f;
	/** 当前缩放模式 */
	private int mLayout = VideoView.VIDEO_LAYOUT_ZOOM;
	private GestureDetector mGestureDetector;
	private MediaController mMediaController;

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);

		Intent intent = getIntent();
		mPath = intent.getStringExtra("path");
		mTitle = intent.getStringExtra("title");
		if (TextUtils.isEmpty(mPath))
			mPath = Environment.getExternalStorageDirectory() + "/video/你太猖狂.flv";
		else if (intent.getData() != null)
			mPath = intent.getData().toString();

		setContentView(R.layout.videoview);
		mVideoView = (VideoView) findViewById(R.id.surface_view);
		mVolumeBrightnessLayout = findViewById(R.id.operation_volume_brightness);
		mOperationBg = (ImageView) findViewById(R.id.operation_bg);
		mOperationPercent = (ImageView) findViewById(R.id.operation_percent);

		mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
		mMaxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
		if (mPath.startsWith("http:"))
			mVideoView.setVideoURI(Uri.parse(mPath));
		else
			mVideoView.setVideoPath(mPath);
		//
		mVideoView.setOnCompletionListener(this);

		mMediaController = new MediaController(this);
		//设置显示名称
		mMediaController.setFileName(mTitle);
		mVideoView.setMediaController(mMediaController);
		mVideoView.requestFocus();

		mGestureDetector = new GestureDetector(this, new MyGestureListener());

		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
	}

	@Override
	protected void onPause() {
		super.onPause();
		if (mVideoView != null)
			mVideoView.pause();
	}

	@Override
	protected void onResume() {
		super.onResume();
		if (mVideoView != null)
			mVideoView.resume();
	}

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

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (mGestureDetector.onTouchEvent(event))
			return true;

		// 处理手势结束
		switch (event.getAction() & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_UP:
			endGesture();
			break;
		}

		return super.onTouchEvent(event);
	}

	/** 手势结束 */
	private void endGesture() {
		mVolume = -1;
		mBrightness = -1f;

		// 隐藏
		mDismissHandler.removeMessages(0);
		mDismissHandler.sendEmptyMessageDelayed(0, 500);
	}

	private class MyGestureListener extends SimpleOnGestureListener {

		/** 双击 */
		@Override
		public boolean onDoubleTap(MotionEvent e) {
			if (mLayout == VideoView.VIDEO_LAYOUT_ZOOM)
				mLayout = VideoView.VIDEO_LAYOUT_ORIGIN;
			else
				mLayout++;
			if (mVideoView != null)
				mVideoView.setVideoLayout(mLayout, 0);
			return true;
		}

		/** 滑动 */
		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
			float mOldX = e1.getX(), mOldY = e1.getY();
			int y = (int) e2.getRawY();
			Display disp = getWindowManager().getDefaultDisplay();
			int windowWidth = disp.getWidth();
			int windowHeight = disp.getHeight();

			if (mOldX > windowWidth * 4.0 / 5)// 右边滑动
				onVolumeSlide((mOldY - y) / windowHeight);
			else if (mOldX < windowWidth / 5.0)// 左边滑动
				onBrightnessSlide((mOldY - y) / windowHeight);

			return super.onScroll(e1, e2, distanceX, distanceY);
		}
	}

	/** 定时隐藏 */
	private Handler mDismissHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			mVolumeBrightnessLayout.setVisibility(View.GONE);
		}
	};

	/**
	 * 滑动改变声音大小
	 *
	 * @param percent
	 */
	private void onVolumeSlide(float percent) {
		if (mVolume == -1) {
			mVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
			if (mVolume < 0)
				mVolume = 0;

			// 显示
			mOperationBg.setImageResource(R.drawable.video_volumn_bg);
			mVolumeBrightnessLayout.setVisibility(View.VISIBLE);
		}

		int index = (int) (percent * mMaxVolume) + mVolume;
		if (index > mMaxVolume)
			index = mMaxVolume;
		else if (index < 0)
			index = 0;

		// 变更声音
		mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, index, 0);

		// 变更进度条
		ViewGroup.LayoutParams lp = mOperationPercent.getLayoutParams();
		lp.width = findViewById(R.id.operation_full).getLayoutParams().width * index / mMaxVolume;
		mOperationPercent.setLayoutParams(lp);
	}

	/**
	 * 滑动改变亮度
	 *
	 * @param percent
	 */
	private void onBrightnessSlide(float percent) {
		if (mBrightness < 0) {
			mBrightness = getWindow().getAttributes().screenBrightness;
			if (mBrightness <= 0.00f)
				mBrightness = 0.50f;
			if (mBrightness < 0.01f)
				mBrightness = 0.01f;

			// 显示
			mOperationBg.setImageResource(R.drawable.video_brightness_bg);
			mVolumeBrightnessLayout.setVisibility(View.VISIBLE);
		}
		WindowManager.LayoutParams lpa = getWindow().getAttributes();
		lpa.screenBrightness = mBrightness + percent;
		if (lpa.screenBrightness > 1.0f)
			lpa.screenBrightness = 1.0f;
		else if (lpa.screenBrightness < 0.01f)
			lpa.screenBrightness = 0.01f;
		getWindow().setAttributes(lpa);

		ViewGroup.LayoutParams lp = mOperationPercent.getLayoutParams();
		lp.width = (int) (findViewById(R.id.operation_full).getLayoutParams().width * lpa.screenBrightness);
		mOperationPercent.setLayoutParams(lp);
	}

	@Override
	public void onConfigurationChanged(Configuration newConfig) {
		if (mVideoView != null)
			mVideoView.setVideoLayout(mLayout, 0);
		super.onConfigurationChanged(newConfig);
	}

	@Override
	public void onCompletion(MediaPlayer player) {
		finish();
	}
}

videoView 是android 系统提供的一个媒体播放显示和控制的控件。其结构层次如下：

　　原型：VideoView extends SurfaceView implements MediaController.MediaPlayerControl

　　类结构：

　　　　　　java.lang.Object
　　　　　　　　↳ android.view.View
　　　　　　　　　　↳ android.view.SurfaceView
　　　　　　　　　　　　↳ android.widget.VideoView

　　通过VideoView 的原型可知：如果构建更为复杂和有特色个性的视频View，需要继承SurfaceView 和实现MediaPlayerControl接口。其中SurfaceView 为显示提供支持，MediaPlayerControl则为媒体控制提供了支持。

核心播放类：

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class PlayerActivity extends Activity implements OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback {

	private static final String TAG = "MediaPlayerDemo";
	private int mVideoWidth;
	private int mVideoHeight;
	private MediaPlayer mMediaPlayer;
	private SurfaceView mPreview;
	private SurfaceHolder holder;
	private String path = Environment.getExternalStorageDirectory() + "/Moon.mp4";

	private boolean mIsVideoSizeKnown = false;
	private boolean mIsVideoReadyToBePlayed = false;

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.mediaplayer);
		mPreview = (SurfaceView) findViewById(R.id.surface);
		holder = mPreview.getHolder();
		holder.addCallback(this);
	}

	private void playVideo() {
		doCleanUp();
		try {
			mMediaPlayer = new MediaPlayer(this);
			mMediaPlayer.setDataSource(path);
			mMediaPlayer.setDisplay(holder);
			mMediaPlayer.prepareAsync();
			mMediaPlayer.setScreenOnWhilePlaying(true);
			mMediaPlayer.setOnBufferingUpdateListener(this);
			mMediaPlayer.setOnCompletionListener(this);
			mMediaPlayer.setOnPreparedListener(this);
			mMediaPlayer.setOnVideoSizeChangedListener(this);
		} catch (Exception e) {
			Log.e(TAG, "error: " + e.getMessage(), e);
		}
	}

	@Override
  public void onBufferingUpdate(MediaPlayer arg0, int percent) {
		Log.d(TAG, "onBufferingUpdate percent:" + percent);

	}

	@Override
  public void onCompletion(MediaPlayer arg0) {
		Log.d(TAG, "onCompletion called");
		mMediaPlayer.release();
	}

	@Override
  public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
		Log.v(TAG, "onVideoSizeChanged called");
		if (width == 0 || height == 0) {
			Log.e(TAG, "invalid video width(" + width + ") or height(" + height + ")");
			return;
		}
		mIsVideoSizeKnown = true;
		mVideoWidth = width;
		mVideoHeight = height;
		if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
			startVideoPlayback();
		}
	}

	@Override
  public void onPrepared(MediaPlayer mediaplayer) {
		Log.d(TAG, "onPrepared called");
		mIsVideoReadyToBePlayed = true;
		if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
			startVideoPlayback();
		}
	}

	@Override
  public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) {
		Log.d(TAG, "surfaceChanged called" + i + "  " + j + "   " + k);
	}

	@Override
  public void surfaceDestroyed(SurfaceHolder surfaceholder) {
		Log.d(TAG, "surfaceDestroyed called");
	}

	@Override
  public void surfaceCreated(SurfaceHolder holder) {
		Log.d(TAG, "surfaceCreated called");
		playVideo();
	}

	@Override
	protected void onPause() {
		super.onPause();
		releaseMediaPlayer();
		doCleanUp();
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		releaseMediaPlayer();
		doCleanUp();
	}

	private void releaseMediaPlayer() {
		if (mMediaPlayer != null) {
			mMediaPlayer.release();
			mMediaPlayer = null;
		}
	}

	private void doCleanUp() {
		mVideoWidth = 0;
		mVideoHeight = 0;
		mIsVideoReadyToBePlayed = false;
		mIsVideoSizeKnown = false;
	}

	private void startVideoPlayback() {
		Log.v(TAG, "startVideoPlayback");
		holder.setFixedSize(mVideoWidth, mVideoHeight);
		mMediaPlayer.start();
	}
}

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