VideoView的使用

先看VideoView的API

1.加载视频主要是通过以下两个方法调用资源的：

mVideoView.setVideoPath(uri);
mVideoView.setVideoURI(Uri.parse(uri));

2.然后通过mVideoView.start()， mVideoView.pause()，  mVideoView.resume()，mVideoView.stopPlayback();开始、暂停、继续、停止操作，mVideoView.getDuration()可以返回视频的长度，可以结合mVideoView.resume();方法进行记忆播放和缓存播放。

3.看个实例：

• XML比较简单，我这里还有个主xml文件布局是为了演示两个功能的，比较简单就是两个按钮，点击不同的按钮，传递不同的uri

videoview的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <VideoView 
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

fragment_main功能演示xml

<LinearLayout 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"
    android:orientation="vertical"
    android:padding="10dp">

    <Button 
        android:id="@+id/local_uri_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="播放本地视频"/>
    <Button 
        android:id="@+id/net_uri_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="播放网络视频"/>
</LinearLayout>

• 主文件VideoPalyActivity 进行播放

package com.lzy.videoviewdemo;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.widget.MediaController;
import android.widget.VideoView;

public class VideoPalyActivity extends Activity {
	private VideoView mVideoView;
	private String uri;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.video_view_layout);
		
		Intent intent = getIntent();
		uri = intent.getStringExtra("uri");
		
		mVideoView = (VideoView) findViewById(R.id.video_view);
		mVideoView.setMediaController(new MediaController(VideoPalyActivity.this));
		if (uri.contains(Environment.getExternalStorageDirectory().toString())) {
			mVideoView.setVideoPath(uri);
		}else {
			mVideoView.setVideoURI(Uri.parse(uri));
		}
		
		mVideoView.start();
		
	}
	
	@Override
	protected void onPause() {
		mVideoView.pause();
		super.onPause();
	}
	
	@Override
	protected void onResume() {
		mVideoView.resume();
		super.onResume();
	}
	
	@Override
	protected void onDestroy() {
		mVideoView.stopPlayback();
		super.onDestroy();
	}
	
}

• 跳转文件MainActivity

package com.lzy.videoviewdemo;

import java.io.File;

import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;

public class MainActivity extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		if (savedInstanceState == null) {
			getSupportFragmentManager().beginTransaction()
					.add(R.id.container, new PlaceholderFragment()).commit();
		}
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment implements OnClickListener{

		private Button localUriButton, netUriButton;
		private String localPath = "1";
		private String netUri = "2";
		
		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_main, container,
					false);
			localUriButton = (Button) rootView.findViewById(R.id.local_uri_button);
			netUriButton = (Button) rootView.findViewById(R.id.net_uri_button);
			
			localUriButton.setOnClickListener(this);
			netUriButton.setOnClickListener(this);
			
			return rootView;
		}

		@Override
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.local_uri_button:
				localPath = Environment.getExternalStorageDirectory() + "/DCIM/Video/V50918-132022.mp4";
				File file = new File(localPath);
				localPath = file.getAbsolutePath();
				openPlayVideoAct(localPath);
				break;

			case R.id.net_uri_button:
				netUri = "一个网络视频地址";
				openPlayVideoAct(netUri);
				break;
			default:
				break;
			}
			
		}

		private void openPlayVideoAct(String uri) {
			Intent intent = new Intent(getActivity(), VideoPalyActivity.class);
			intent.putExtra("uri", uri);
			startActivity(intent);
		}
	}

}

4.别忘了加权限，网络访问和读取SD卡权限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

5.遇到的问题，娇气的VideoView

来自

至此，一个简单的系统视频播放器就完成了，在下一篇博客中我们来实现一个播放器APP，把视频、音频的东西总结下。

—— lovey hy