Android自动更新代码

import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.Handler; public class Update extends BaseActivity { public ProgressDialog pBar; private Handler handler = new Handler(); @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.update); Dialog dialog = new AlertDialog.Builder(Update. this ) .setTitle( "系统更新" ) .setMessage( "发现新版本，请更新！" ) // 设置内容 .setPositiveButton( "确定" , // 设置确定按钮 new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { pBar = new ProgressDialog(Update. this ); pBar.setTitle( "正在下载" ); pBar.setMessage( "请稍候..." ); pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER); downFile( "http://url:8765/OA.apk" ); } }) .setNegativeButton( "取消" , new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // 点击"取消"按钮之后退出程序 } }).create(); // 创建 // 显示对话框 dialog.show(); } void downFile( final String url) { pBar.show(); new Thread() { public void run() { HttpClient client = new DefaultHttpClient(); // params[0]代表连接的url HttpGet get = new HttpGet(url); HttpResponse response; try { response = client.execute(get); HttpEntity entity = response.getEntity(); long length = entity.getContentLength(); InputStream is = entity.getContent(); FileOutputStream fileOutputStream = null ; if (is != null ) { File file = new File( Environment.getExternalStorageDirectory(), "OA.apk" ); fileOutputStream = new FileOutputStream(file); byte [] buf = new byte [ 1024 ]; int ch = - 1 ; int count = 0 ; while ((ch = is.read(buf)) != - 1 ) { // baos.write(buf, 0, ch); fileOutputStream.write(buf, 0 , ch); count += ch; if (length > 0 ) { } } } fileOutputStream.flush(); if (fileOutputStream != null ) { fileOutputStream.close(); } down(); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }.start(); } void down() { handler.post( new Runnable() { public void run() { pBar.cancel(); update(); } }); } void update() { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile( new File( "/sdcard/OA.apk" )), "application/vnd.android.package-archive" ); startActivity(intent); } }

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