使用surfaceview进行mediaplayer文件切换播放2
来源：互联网 发布：海湾调试软件 编辑：程序博客网 时间：2024/05/16 04:51
遇到的是真机测试的问题，模拟器能正常播放。
之前有篇关于mediaplayer，这次只是一些简单的修改。
问题描述：
在进行不同视频文件切换时，mediaplayer并不能正常启动播放（时常出现）。
会提示D/MediaPlayer(29517): start() mUri is null错误
切换时的主要操作方法是
1.关闭播放并重置MediaPlayer
MediaPlayer.stop()
MediaPlayer.reset()
2.之后调用播放设置
MediaPlayer.setDataSource(file)
MediaPlayer.prepare()
MediaPlayer.start()
尝试增加了reset的间隔后，可以正常播放，一直没明白什么原因（有大侠知道原因的可以指导下^_^）
之所以想到用增加时间间隔的方法，主要是因为在进行手动的停止并再启动时，视频能正常播放，而这中间进行的操作步骤完全相同。
下面贴一下代码（和第一版些许的差别，主要是给自己加深下印象）
package com.exam.test.main;import java.io.File;import android.content.Intent;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnBufferingUpdateListener;import android.media.MediaPlayer.OnCompletionListener;import android.media.MediaPlayer.OnSeekCompleteListener;import android.os.Bundle;import android.os.Handler;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.ImageButton;import android.widget.LinearLayout;import android.widget.TextView;import com.exam.test.R;import com.exam.engine.util.LogX;public class mainVideoActivity extends main implements MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener, OnBufferingUpdateListener, OnCompletionListener, OnSeekCompleteListener, SurfaceHolder.Callback{ /** * TAG */ private static final String TAG = "mainVideoActivity "; /** * 视频监控器地理信息 */ private String monitorLocationInfo; /** * 加载页面 */ private LinearLayout initView; /** * 位置信息textview */ private TextView text; /** * 监控器页面 */ private LinearLayout playView; /** * 监控控制 */ private MediaPlayer mMediaPlayer; /** * 文件路径 */ private String filePath; /** * surfaceHolder */ private SurfaceHolder surfaceHolder; /** * 暂停按钮 */ private ImageButton btnPause; private static final int PLAYING = 1; private static final int PAUSED = 2; private static final int STOPED = 3; /** * 是否正在播放 */ private int status; private boolean isPrepared; /** * runner */ private Runnable runner = new Runnable() { @Override public void run() { handler.sendEmptyMessageDelayed(0, 2000); } }; /** * handler */ private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { if (0 == msg.what) { initView.setVisibility(View.GONE); this.removeCallbacks(runner); LogX.trace(TAG, "handleMessage& mMediaPlayer.start() : " + mMediaPlayer); if (mMediaPlayer != null) { mMediaPlayer.setLooping(true); mMediaPlayer.start(); btnPause.setBackgroundResource(R.drawable.btn_video_pause_selector); status = PLAYING; isPrepared = true; } isLocked = false; } else { playVideo(); } } }; /** * 控制按钮 */ private View.OnClickListener btnClickListener = new View.OnClickListener() { @Override public void onClick(View v) { LogX.trace(TAG, "onClick& status : " + status + ", isPrepared : " + isPrepared + ", mMediaPlayer : " + mMediaPlayer); if (mMediaPlayer == null || !isPrepared) { return; } if (v.getId() == R.id.btn_video_pause) { switch (status) { case PLAYING: status = PAUSED; mMediaPlayer.pause(); btnPause.setBackgroundResource(R.drawable.btn_video_play_selector); break; case PAUSED: status = PLAYING; mMediaPlayer.start(); btnPause.setBackgroundResource(R.drawable.btn_video_pause_selector); break; case STOPED: isPrepared = false; playVideo(); break; default: break; } } else if (status == PLAYING || status == PAUSED) { status = STOPED; mMediaPlayer.stop(); mMediaPlayer.reset(); btnPause.setBackgroundResource(R.drawable.btn_video_play_selector); } LogX.trace(TAG, "onClick& status : " + status); } }; /** * {@inheritDoc} */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); playView = (LinearLayout)inflater.inflate(R.layout.main_video_play, null); content.setOnClickListener(new View.OnClickListener() { long mLastClickTime = 0; @Override public void onClick(View v) { if (System.currentTimeMillis() - mLastClickTime < 2000) { return; } mLastClickTime = System.currentTimeMillis(); if (cBottom.getVisibility() == View.VISIBLE) { content.setPadding(0, 0, 0, 0); cTopSapce.setVisibility(View.GONE); cBottomSapce.setVisibility(View.GONE); cRight.setVisibility(View.GONE); cBottom.setVisibility(View.GONE); } else { content.setPadding(8, 8, 8, 8); cBottomSapce.setVisibility(View.VISIBLE); cTopSapce.setVisibility(View.VISIBLE); cRight.setVisibility(View.VISIBLE); cBottom.setVisibility(View.VISIBLE); } } }); loadIntentData(); setContentData(); loadVideoData(); } /** * {@inheritDoc} * 连接请求 */ @Override protected void sendRequest(mainBean bean) { LogX.trace(TAG, "sendRequest& isLocked : " + isLocked); if (!isLocked) { monitorLocationInfo = bean.getDetailInfo(); filePath = videoFilePath + bean.getCameraId(); mMediaPlayer.stop(); mMediaPlayer.reset(); // playVideo(); isLocked = true; isPrepared = false; text.setText(monitorLocationInfo); initView.setVisibility(View.VISIBLE); // 在连续进行切换文件时，存在不能正常开始播放的问题 // 在reset后延迟1秒钟进行设置，可以正常播放---原因不明 handler.sendEmptyMessageDelayed(1, 1000); } } /** * <加载Intent传递的数据> * @see [类、类#方法、类#成员] */ private void loadIntentData() { //获取Intent数据 Bundle bundle = getIntent().getExtras(); if (bundle != null) { mainBean mbean = (mainBean)bundle.getSerializable("main"); monitorLocationInfo = mbean.getDetailInfo(); filePath = videoFilePath + mbean.getCameraId(); LogX.trace(TAG, "loadIntentData& mbean : " + mbean); } } /** * <加载视频数据> * @see [类、类#方法、类#成员] */ private void loadVideoData() { content.addView(playView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); btnPause = (ImageButton)findViewById(R.id.btn_video_pause); btnPause.setOnClickListener(btnClickListener); findViewById(R.id.btn_video_stop).setOnClickListener(btnClickListener); initView = (LinearLayout)findViewById(R.id.video_inital); text = ((TextView)findViewById(R.id.monitor_video_info)); surfaceHolder = ((SurfaceView)findViewById(R.id.video_view)).getHolder(); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceHolder.addCallback(this); } /** * <play> * @see [类、类#方法、类#成员] */ private void playVideo() { if (initView.getVisibility() == View.GONE) { isLocked = true; isPrepared = false; text.setText(monitorLocationInfo); initView.setVisibility(View.VISIBLE); } try { if (!new File(filePath).exists()) { throw new Exception(filePath + " is not exist"); } mMediaPlayer.setDataSource(filePath); mMediaPlayer.prepare(); LogX.trace(TAG, "playVideo& filePath : " + filePath + ", isLocked : " + isLocked); } catch (Exception e) { btnPause.setBackgroundResource(R.drawable.btn_video_pause_selector); isLocked = false; e.printStackTrace(); LogX.trace(TAG, "playVideo& Exception : " + e.toString()); } } /** * {@inheritDoc} * 搜索并更新列表数据 */ @Override protected void search(String keyword) { super.search(keyword); super.setContentData(); } /** * {@inheritDoc} * MediaPlayer.start() */ @Override public void onPrepared(MediaPlayer mp) { // surfaceHolder.setFixedSize(mVideoWidth, mVideoHeight); // initView.setVisibility(View.GONE); runner.run(); LogX.trace(TAG, "onPrepared& MediaPlayer.start() " + mp.getDuration()); } /** * {@inheritDoc} */ @Override public void onCompletion(MediaPlayer mp) { LogX.trace(TAG, "onCompletion&"); } /** * {@inheritDoc} */ @Override public void onBufferingUpdate(MediaPlayer mp, int percent) { LogX.trace(TAG, "onBufferingUpdate& percent : " + percent); } /** * {@inheritDoc} */ @Override public boolean onError(MediaPlayer mp, int what, int extra) { LogX.trace(TAG, "onError& what : " + what + ", extra : " + extra); return false; } /** * {@inheritDoc} */ @Override public void onSeekComplete(MediaPlayer mp) { LogX.trace(TAG, "onSeekComplete&"); } /** * {@inheritDoc} */ @Override public void surfaceCreated(SurfaceHolder holder) { LogX.trace(TAG, "surfaceCreated&"); try { mMediaPlayer.setDisplay(holder); playVideo(); } catch (Exception e) { e.printStackTrace(); } } /** * {@inheritDoc} */ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { LogX.trace(TAG, "surfaceChanged&"); } /** * {@inheritDoc} */ @Override public void surfaceDestroyed(SurfaceHolder holder) { if (mMediaPlayer != null) { handler.removeCallbacks(runner); mMediaPlayer.release(); mMediaPlayer = null; } LogX.trace(TAG, "surfaceDestroyed&"); } /** * {@inheritDoc} */ @Override protected void back() { startActivity(new Intent(mainVideoActivity.this, mainActivity.class)); this.finish(); } /** * {@inheritDoc} */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { back(); return true; } return super.onKeyDown(keyCode, event); } @Override protected void onResume() { LogX.trace(TAG, "onResume&"); super.onResume(); mMediaPlayer = new MediaPlayer(); mMediaPlayer.setScreenOnWhilePlaying(true); mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mMediaPlayer.setOnPreparedListener(this); mMediaPlayer.setOnSeekCompleteListener(this); mMediaPlayer.setOnBufferingUpdateListener(this); mMediaPlayer.setOnCompletionListener(this); mMediaPlayer.setOnErrorListener(this); } @Override protected void onStart() { LogX.trace(TAG, "onStart&"); super.onStart(); } @Override protected void onPause() { LogX.trace(TAG, "onPause&"); super.onPause(); } /** * {@inheritDoc} */ @Override protected void onStop() { LogX.trace(TAG, "onStop&"); super.onStop(); } @Override protected void onDestroy() { LogX.trace(TAG, "onDestroy&"); super.onDestroy(); if (mMediaPlayer != null) { handler.removeCallbacks(runner); mMediaPlayer.release(); mMediaPlayer = null; } }}- 使用surfaceview进行mediaplayer文件切换播放2
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