/** 
 * 静默安装 
 * @param file 
 * @return 
 */ 
public boolean slientInstall(File file) { 
  boolean result = false; 
  Process process = null; 
  OutputStream out = null; 
  try { 
    process = Runtime.getRuntime().exec("su"); 
    out = process.getOutputStream(); 
    DataOutputStream dataOutputStream = new DataOutputStream(out); 
    dataOutputStream.writeBytes("chmod 777 " + file.getPath() + "\n"); 
    dataOutputStream.writeBytes("LD_LIBRARY_PATH=/vendor/lib:/system/lib pm install -r " + 
        file.getPath()); 
    // 提交命令 
    dataOutputStream.flush(); 
    // 关闭流操作 
    dataOutputStream.close(); 
    out.close(); 
    int value = process.waitFor(); 
     
    // 代表成功 
    if (value == 0) { 
      result = true; 
    } else if (value == 1) { // 失败 
      result = false; 
    } else { // 未知情况 
      result = false; 
    } 
  } catch (IOException e) { 
    e.printStackTrace(); 
  } catch (InterruptedException e) { 
    e.printStackTrace(); 
  } 
   
  return result; 
}