android程序后台自动安装代码

    <!– 以下是静默安装apk所需要到权限 –>
        <uses-permission android:name=“android.permission.INSTALL_PACKAGES” />  
        <uses-permission android:name=“android.permission.DELETE_PACKAGES” />  
        <uses-permission android:name=“android.permission.CLEAR_APP_CACHE” />  
        <uses-permission android:name=“android.permission.CLEAR_APP_USER_DATA” />  
        <uses-permission android:name=“android.permission.READ_PHONE_STATE” />  

    /** 
         * 软件静默安装 
         * @param apkAbsolutePath apk文件所在路径 
         * @return 安装结果:获取到的result值<br> 
         *  
         * 如果安装成功的话是“ 
         * pkg: /data/local/tmp/Calculator.apk  /nSuccess”，<br> 
         * 如果是失败的话，则没有结尾的“Success”。 
         */  
        public String silentInstall(String apkAbsolutePath) {  
            String[] args = { “pm”,“install”,“-r”,apkAbsolutePath };  
            String result = “”;  
            ProcessBuilder processBuilder = new ProcessBuilder(args);  
            Process process = null;  
            InputStream errIs = null;  
            InputStream inIs = null;  
            try {  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                int read = -1;  
                process = processBuilder.start();
                errIs = process.getErrorStream();
                while ((read = errIs.read()) != -1) {  
                    baos.write(read);
                }
                baos.write(“/n”.getBytes());  
                inIs = process.getInputStream();
                while ((read = inIs.read()) != -1) {  
                    baos.write(read);
                }
                byte[] data = baos.toByteArray();  
                result = new String(data);  
            } catch (IOException e) {  
                e.printStackTrace();
            } catch (Exception e) {  
                e.printStackTrace();
            } finally {  
                try {  
                    if (errIs != null) {  
                        errIs.close();
                    }
                    if (inIs != null) {  
                        inIs.close();
                    }
                } catch (IOException e) {  
                    e.printStackTrace();
                }
                if (process != null) {  
                    process.destroy();
                }
            }
            return result;  
        }