Activity编程之视频播放界面

最近涉及到一个需要播放视频的界面，内容不多，直接上代码。

先看布局文件act_video_play，里面有一个VideoView组件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:background="#ff000000"
	android:gravity="center" >
	<VideoView
		android:id="@+id/videoView"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center" />
</LinearLayout>

在来看activity代码：

package com.example.playmp4;

import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnKeyListener;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.view.KeyEvent;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.MediaController;
import android.widget.VideoView;

public class PlayMP4 extends Activity {

	private VideoView videoView;
	private int play_progress;
	private String video_url;
	private String progress_Title;
	private Dialog progress;

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

		Intent intent = getIntent();
		video_url = intent.getStringExtra("video_url");
		progress_Title = intent.getStringExtra("title");

		// for test
		video_url = Environment.getExternalStorageDirectory().toString()
				+ "/dcim/100MEDIA/VIDEO0002.mp4";

		if (this.progress_Title == null)
			this.progress_Title = "Loading";

		play_progress = intent.getIntExtra("play_progress", 0);
		videoView = (VideoView) findViewById(R.id.videoView);
		progress = ProgressDialog.show(this, "loading", progress_Title);
		progress.setOnKeyListener(new OnKeyListener() {
			@Override
			public boolean onKey(DialogInterface dialog, int keyCode,
					KeyEvent event) {
				if (keyCode == KeyEvent.KEYCODE_BACK) {
					dialog.dismiss();
					PlayMP4.this.finish();
				}
				return false;
			}
		});

		videoView.setVideoURI(Uri.parse(video_url));
		MediaController controller = new MediaController(this);
		videoView.setMediaController(controller);
		videoView.requestFocus();

		videoView.setLayoutParams(new LinearLayout.LayoutParams(
			LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
		
		videoView.setOnPreparedListener(new OnPreparedListener() {
			@Override
			public void onPrepared(MediaPlayer mp) {
				if (progress != null)
					progress.dismiss();
			}
		});

		videoView.setOnCompletionListener(new OnCompletionListener() {
			@Override
			public void onCompletion(MediaPlayer mp) {
				if (progress != null)
					progress.dismiss();
			}
		});
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			Intent intent = new Intent();
			intent.putExtra("play_progress", videoView.getCurrentPosition());
			setResult(RESULT_OK, intent);
		}
		return super.onKeyDown(keyCode, event);
	}

	@Override
	protected void onResume() {
		super.onResume();
		videoView.seekTo(play_progress);
		videoView.start();
	}

	@Override
	protected void onStop() {
		super.onStop();
		if (videoView != null) {
			videoView.pause();
			play_progress = videoView.getCurrentPosition();
		}
		if (progress != null) {
			progress.dismiss();
		}
	}
}

video_url这个就是播放的地址，可以是本地文件地址，也可以是网络上的链接。

play_progress为播放进度。当这个播放界面关闭后，会返回该值给上一级界面。下次再播放同一个视频时，就可以直接从上一次停止的位置播放。如何处理记录播放位置，这个就根据应用情况，请自行设计，这里就不多啰嗦了。

这个就不附工程了，代码如上。