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使用VideoView实现简单视频播放器

发布时间:2017-09-13 11:48:16
使用VideoView实现简单视频播放器

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 ,站群,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:

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

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