自动更新apk

 

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.PublicKey;

import ist.angle.mobile.R;
import android.R.integer;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

public class DownLoadDialog extends AlertDialog {

	private ProgressBar barDownload;
	private TextView textProgress;
	private String PROGRESS ;
	private double size;
	int hasDowned = 0;
	private Context context;
	private File file ;
	private Handler handler = new Handler() {
		public void handleMessage(Message msg) {
			if (msg.what == 1) {
				hasDowned += msg.arg1;
				if (hasDowned == size) {
					barDownload.setProgress(100);
					textProgress.setText("下载已经完成！");
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					openFile();
					return ;
				}
				Log.d("downed", ""+hasDowned);
				int intProgress = (int) ((hasDowned / size) * 100);
				barDownload.setProgress(intProgress);
				textProgress.setText(String.format(PROGRESS, intProgress));
			}
		}
	};

	public DownLoadDialog(Context context) {
		super(context);
		show();
		this.context  = context;
        PROGRESS  =  context.getString(R.string.down_progress);
		View viewDown = LayoutInflater.from(context).inflate(
				R.layout.download_dialog, null);
		barDownload = (ProgressBar) viewDown.findViewById(R.id.bar_download);
		barDownload.setPressed(true);
		barDownload.setMax(100);
		textProgress = (TextView) viewDown.findViewById(R.id.text_progress);
		textProgress.setText(String.format(PROGRESS, 0));
		setContentView(viewDown);
		new Thread(new Runnable() {

			public void run() {
				HttpURLConnection connection = null;
				URL url;
				InputStream inputStream = null;
				FileOutputStream outputStream = null;
				try {
					url = new URL(
							"http://dl.91rb.com/a5495acfb55f94ce25ac3bcd4de49c55/android/soft/2011/11/2/d537810d27024249b7e6b41a8a413b17/com.diandian-11.apk");
					connection = (HttpURLConnection) url.openConnection();
					connection.setConnectTimeout(5000);
					connection.setDoInput(true);// 允许输入
					connection.setDoOutput(true);// 允许输出
					connection.setUseCaches(false); // 不允许使用缓存
					connection.setRequestMethod("GET");
					connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.79 Safari/535.11");
					connection.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
					connection.connect();
					inputStream = connection.getInputStream();
				   
					file = new File("/sdcard/mobile_uwenke.apk");
					outputStream = new FileOutputStream(file);
					// 文件大小
					size = connection.getContentLength();
					
					byte[] buff = new byte[2048];
					int length = 0;
					while ((length = inputStream.read(buff)) != -1) {
						outputStream.write(buff,0,length);
						Message msg = new Message();
						msg.arg1 = length;
						msg.what = 1;
						handler.sendMessage(msg);
					}

				} catch (MalformedURLException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				} finally {
					try {
						connection.disconnect();
						if (inputStream != null)
							inputStream.close();
						if (outputStream != null)
							outputStream.close();
					} catch (IOException e) {
						e.printStackTrace();
					}

				}

			}
		}).start();

	}

	private void openFile() {
		Intent intent = new Intent();
		intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		intent.setAction(android.content.Intent.ACTION_VIEW);
		intent.setDataAndType(Uri.fromFile(file),
				"application/vnd.android.package-archive");
		context.startActivity(intent);
	}

}