install apk just in silence

silence_install_apk

/**
 *  Don't forget to add  <uses-permission android:name="android.permission.INSTALL_PACKAGES" /> in AndroidManifest.xml
 *  I bind this function with Button
 *  referenced with http://www.trinea.cn/android/android-install-silent/
 * @param view
 */
public void installAPK(View view) {
    // assume there is a apk file in /sdcard/ path
    String filePath = "/sdcard/RootExplorer_99.apk";
    String[] args = {"pm", "install", "-r", filePath};
    ProcessBuilder processBuilder = new ProcessBuilder(args);

    Process process = null;
    BufferedReader successResult = null;
    BufferedReader errorResult = null;
    StringBuilder successMsg = new StringBuilder();
    StringBuilder errorMsg = new StringBuilder();

    try {
        process = processBuilder.start();
        successResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
        errorResult = new BufferedReader(new InputStreamReader(process.getErrorStream()));
        String s;
        while ((s = successResult.readLine()) != null) {
            successMsg.append(s);
        }
        while ((s = errorResult.readLine()) != null) {
            errorMsg.append(s);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (successResult != null)
                successResult.close();
            if (errorResult != null)
                errorResult.close();
            if (process != null)
                process.destroy();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    if (successMsg.toString().contains("success") || successMsg.toString().contains("Success")){
        Toast.makeText(getApplication(), "Install APK success:)", Toast.LENGTH_LONG).show();
    }
    Log.d("SilentInstall", "success msg:" + successMsg);
    Log.d("SilentInstall", "error msg:" + errorMsg);
}