Intents

//通过Intent打开uri
public static void openUri(String uri){
      Uri uri = Uri.parse(uri);
      Intent intent  = new Intent(Intent.ACTION_VIEW, uri);
      startActivity(intent);
}

//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);
}

//安装apk
private void openApkFile(File file) {
      String str = "/CanavaCancel.apk"; 
      String fileName = Environment.getExternalStorageDirectory() + str; 
      Intent intent = new Intent(Intent.ACTION_VIEW); 
      intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive"); 
      startActivity(intent);
}

//删除apk
private void deleteApk(){
      Uri packageURI = Uri.parse("package:com.demo.CanavaCancel");   
      Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);   
      startActivity(uninstallIntent);
}