VideoView播放SD卡上视频的例子

先上代码:

package cn.com;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

public class Play3G extends Activity {

	private TextView videoPath;
	private VideoView videoview;
	private String strVideoPath = "";
	private Button video1, video2;
	private String TAG = "HIPPO_VIDEOVIEW";

	/* 默认判别是否安装存储卡flag为false */
	private boolean bIfSDExist = false;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
                //检查是否存在SD卡
		checkTheSdCard();

		videoPath = (TextView) findViewById(R.id.videoPath);
		videoview = (VideoView) findViewById(R.id.videoview);

		video1 = (Button) findViewById(R.id.video1);
		video2 = (Button) findViewById(R.id.video2);

		video1.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				if (bIfSDExist) {
					/* 播放影片路径1 */
					strVideoPath = "file:///sdcard/test.mp4";
					playVideo(strVideoPath);
				}
			}

		});

		video2.setOnClickListener(new Button.OnClickListener() {
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				if (bIfSDExist) {
					/* 播放影片路径2 */
					strVideoPath = "file:///sdcard/test.3gp";
					playVideo(strVideoPath);
				}
			}
		});

	}

	/* 自定义以VideoView播放影片 */
	private void playVideo(String strPath) {
		if (strPath != "") {
			/* 调用VideoURI方法，指定解析路径 */
			videoview.setVideoURI(Uri.parse(strPath));

			/* 设置控制Bar显示于此Context中 */
			videoview.setMediaController(new MediaController(Play3G.this));

			videoview.requestFocus();

			/* 调用VideoView.start()自动播放 */
			videoview.start();
			if (videoview.isPlaying()) {
				/* 下程序不会被运行，因start()后尚需要preparing() */
				videoPath.setText("Now Playing:" + strPath);
				Log.i(TAG, strPath);
			}
		}
	}

	// 检查是否存在SD卡
	public void checkTheSdCard() {
		/* 判断存储卡是否存在 */
		if (android.os.Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			bIfSDExist = true;
		} else {
			bIfSDExist = false;
			mMakeTextToast(getResources().getText(R.string.str_err_nosd)
					.toString(), true);
		}
	}

	// 弹出提示对话框
	public void mMakeTextToast(String str, boolean isLong) {
		if (isLong == true) {
			Toast.makeText(Play3G.this, str, Toast.LENGTH_LONG).show();
		} else {
			Toast.makeText(Play3G.this, str, Toast.LENGTH_SHORT).show();
		}
	}
}

2.main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:background="@drawable/white" android:orientation="vertical"
	android:layout_width="fill_parent" android:layout_height="fill_parent">
	<TextView android:id="@+id/videoPath" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:textColor="@drawable/blue"
		android:text="@string/hello" />
	<VideoView android:id="@+id/videoview" android:layout_width="320px"
		android:layout_height="240px" />
	<LinearLayout android:orientation="horizontal"
		android:layout_width="wrap_content" android:layout_height="wrap_content">
		<Button android:id="@+id/video1" android:layout_width="wrap_content"
			android:layout_height="wrap_content" android:text="@string/str_button1" />
		<Button android:id="@+id/video2" android:layout_width="wrap_content"
			android:layout_height="wrap_content" android:text="@string/str_button2" />
	</LinearLayout>
</LinearLayout>

3.color.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <drawable name="darkgray">#808080</drawable>
  <drawable name="white">#FFFFFF</drawable>
  <drawable name="blue">#0000FF</drawable>
</resources>

以上只是简单播放本地视频,稍后会贴上播放网络视频的例子

评论

1 楼 xiatiaohcx 2010-09-11  

你好，我用了这个方法后，模拟器里只能听见声音，看不到视频是什么原因呢