下载APK文件后自动安装，安卓源码

package com.bcf; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.widget.Toast; public class AutoDownloadSetupAPK extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); String urls="http://android.d.cn/rm/2/978/6228/?http://c.downandroid.com/android/new/game1/29/110029/ucweb_1.apk"; setContentView(R.layout.main); String tempFileType=urls.substring(urls.lastIndexOf("."),urls.length()); String tempFileName=urls.substring(urls.lastIndexOf("/")+1,urls.lastIndexOf(".")); String tempUrl=urls.substring(0, urls.lastIndexOf("/")+1); File file=downLoadFile(tempUrl,tempFileName,tempFileType); openFile(file); } protected File downLoadFile(String httpUrl,String fileNames,String fileType) { // TODO Auto-generated method stub //final String fileName = "spring.mp3"; final String fileName = chineseToHexString(fileNames)+fileType; File tmpFile = new File("/sdcard/"); if (!tmpFile.exists()) { tmpFile.mkdir(); } final File file = new File("/sdcard/" + fileName); try { URL url = new URL(httpUrl+fileName); try { HttpURLConnection conn = (HttpURLConnection) url.openConnection(); InputStream is = conn.getInputStream(); FileOutputStream fos = new FileOutputStream(file); byte[] buf = new byte[256]; conn.connect(); double count = 0; if (conn.getResponseCode() >= 400) { Toast.makeText(AutoDownloadSetupAPK.this, "连接超时", Toast.LENGTH_SHORT) .show(); } else { while (count <= 100) { if (is != null) { int numRead = is.read(buf); if (numRead <= 0) { break; } else { fos.write(buf, 0, numRead); } } else { break; } } } conn.disconnect(); fos.close(); is.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return file; } //打开APK程序代码 private void openFile(File file) { // TODO Auto-generated method stub Log.e("OpenFile", file.getName()); 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"); startActivity(intent); } public String chineseToHexString(String str){ Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show(); if(str==null || str.length()<=0){ return ""; } byte[] a=str.getBytes(); StringBuffer sb = new StringBuffer(); for(int i=0; i<a.length; i++){ sb.append(Integer.toHexString((256+a[i])%256) + " "); } String tempSb=sb.toString(); tempSb=tempSb.replace(" ", "%"); tempSb="%"+tempSb.substring(0, tempSb.lastIndexOf("%")); return tempSb; } }