视频播放器与listView

最新推荐文章于 2020-12-22 11:57:56 发布

Iwwz24

最新推荐文章于 2020-12-22 11:57:56 发布

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分类专栏： android开发文章标签： listview activity的生命周期

本文链接：https://blog.youkuaiyun.com/iwwz24/article/details/44460975

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本文介绍了一款通过语音控制的视频播放器应用，重点讲解了使用Android平台实现视频播放及跳转列表的功能，并展示了如何利用Intent进行不同Activity间的跳转与数据传递。

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最近在做这个视频播放器效果是通过语音来控制视频的播放循序，在一个视频播放完后跳转到一个视频播放列表，用户通过声音来选择播放的视频，这个功能暂时由于语音那边还没做好，先按照传统的点击事件点击播放。

这个问题在于理解activity的生命周期，当一个视频播放完后，回调onCompletion()方法（该方法实现OnCompletionListener 接口），在这个方法中设置Intent跳转到listVideo这个activity显示视频的列表，如图：

当点击item后会根据获得的视频名称在视频播放界面播放视频，主要是当你点击后的Intent跳转到播放的activity是，视频是在activity的oncreate()方法里就要初始化的第一次写有关工作项目的博客，还是直接上代码吧：

首先是播放的activity：

package com.Jw.videoplayer;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.widget.MediaController;
import android.widget.VideoView;

public class PlayingActivity extends Activity implements OnErrorListener,
		OnCompletionListener {

	private VideoView mVideoView;
	private MediaController mMediaController;
	private String uri;
	private boolean isFirstPlaying ;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_playing);
		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
		mVideoView = (VideoView) findViewById(R.id.videoplayer);
		mVideoView.requestFocus();
		mMediaController = new MediaController(this);
		mVideoView.setMediaController(mMediaController);
		mVideoView.setOnCompletionListener(this);
		mVideoView.setOnErrorListener(this);
		isFirstPlaying=getIntent().getBooleanExtra("isFirstPlaying", true);
		if (isFirstPlaying) {
			initData();
			
		} else {
			startPlaying();
		}

	}

	/*
	 * 初始化数据
	 */
	public void initData() {
		// 初始化数据，第一次加载ghsy
		uri = "android.resource://" + getPackageName() + "/" + R.raw.ghsy;
		if (!TextUtils.isEmpty(uri)) {
			mVideoView.setVideoURI(Uri.parse(uri));
		}
		mMediaController = new MediaController(this);
		mVideoView.setMediaController(mMediaController);
	}
	@Override
	protected void onResume() {
		mVideoView.start();
		super.onResume();
		
	}
	@Override
	protected void onStart() {		
		super.onStart();
	}
	@Override
	protected void onPause() {
		mVideoView.stopPlayback();
		super.onPause();
	}
	@Override
	public void onCompletion(MediaPlayer arg0) {
		finish();
		// 视频播放完成后回调该方法
		Intent myIntent = new Intent();
		myIntent.setClass(this, VideoListActivity.class);
		myIntent.putExtra("isFirstPlaying", isFirstPlaying);
		startActivity(myIntent);
	}
	@Override
	public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
		// TODO Auto-generated method stub
		return false;
	}
	
	public void startPlaying(){
		String videoName = getIntent().getStringExtra("videoName");
		Log.v("PlayingActivity", videoName);
		isFirstPlaying = getIntent().getBooleanExtra("isFirstPlaying", false);
		if (videoName.contains("abc")) {
			uri = "android.resource://" + getPackageName() + "/" + R.raw.abc;
			mVideoView.setVideoURI(Uri.parse(uri));
		}else if(videoName.contains("hhh")){
			uri = "android.resource://" + getPackageName() + "/" + R.raw.hhh;
			mVideoView.setVideoURI(Uri.parse(uri));
		}else if(videoName.contains("ghsy")){
			uri = "android.resource://" + getPackageName() + "/" + R.raw.ghsy;
			mVideoView.setVideoURI(Uri.parse(uri));
		}else if(videoName.contains("uuu")){
			uri = "android.resource://" + getPackageName() + "/" + R.raw.uuu;
			mVideoView.setVideoURI(Uri.parse(uri));
		}
		
		
		
	}

}

然后这个是显示视频列表的activity：

package com.Jw.videoplayer;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

import com.Jw.entity.Video;
import com.jwbot.mscservice.MscServicePlugin;


public class VideoListActivity extends Activity {
	//语音引擎
	private MscServicePlugin mscServicePlugin;
	
	private List<Video> videos;
	private Video       mvideo;
	private ListView    lv_video;
	private String      videoName;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_video_list);
		videos=getVideos();
		lv_video=(ListView) findViewById(R.id.lv_video);
		lv_video.setAdapter(new MyAdapter());
		lv_video.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
				//Log.v("VideoListActivity",position+"");
				Log.v("VideoListActivity",videos.get(position).getVideoName());
				videoName=videos.get(position).getVideoName();
				boolean isFirstPlaying=getIntent().getBooleanExtra("isFirstPlaying", true);
				Intent myIntent=new Intent(VideoListActivity.this,PlayingActivity.class);
				isFirstPlaying=false;
				myIntent.putExtra("videoName", videoName);
		    	myIntent.putExtra("isFirstPlaying", isFirstPlaying);
		    	startActivity(myIntent);
			    /*if(isAdapter(videoName)){
			    	myIntent.putExtra("videoName", videoName);
			    	myIntent.putExtra("isFirstPlaying", isFirstPlaying);
			    	startActivity(myIntent);
			    }*/    
			}
		});
		
	}
	@Override
	protected void onResume() {	
		super.onResume();
		Log.v("(((((", "onResume");
		mscServicePlugin = MscServicePlugin.createInstance(this,
				new MyHandler());
		
	}
	@Override
	protected void onDestroy() {
		
		super.onDestroy();
		Log.v(")))))))))", "onDestroy");
		/**
		 * 销毁当前语音引擎
		 */
		mscServicePlugin.destroyAsrService();
	}
	
	public List<Video> getVideos(){
		videos=new ArrayList<Video>();
		Field[] fields = R.raw.class.getDeclaredFields();
		for(int i=0;i<=fields.length;i++){
			try {						
			    mvideo=new Video(fields[i].getName());
			    videos.add(mvideo);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		fields=null;
		return videos;
	}
	
	private boolean isAdapter(String name){
		if(name.contains("abc")){
			return true;
		}
		return false;
	}
	
	
	class MyAdapter extends BaseAdapter{

		@Override
		public int getCount() {
			return videos.size();
		}
		@Override
		public Object getItem(int arg0) {
			
			return null;
		}

		@Override
		public long getItemId(int arg0) {
			
			return 0;
		}
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View view=null;
			if(convertView==null){
				LayoutInflater inflater=VideoListActivity.this.getLayoutInflater();
				view=inflater.inflate(R.layout.videos_items, null);
			}else{
				view=convertView;
			}	
			Video video=videos.get(position);
			TextView videoName=(TextView) view.findViewById(R.id.tv_videoName);
			videoName.setText(video.getVideoName()+"");
			return view;
		}
    }
	/*
	 * 传递消息的Handler
	 */
	private class MyHandler extends Handler {
		/**
		 * 提供一个语音命令识别参考
		 */
		@Override
		public void handleMessage(Message msg) {
			String text = (String) msg.obj;
			Log.v("回到主线程，获取识别到内容", text);
			if ("build_success".equals(text))
				mscServicePlugin.startAsrService();
		}

	}

}

第一次写有关工作的的代码，当然其中有很多的方法是在语音那一块需要用到，有些代码就需要大家自动过滤了