/**
 * 執行具體的靜默安裝邏輯，需要手機ROOT。
 * @param apkPath
*          要安裝的apk檔案的路徑 
 * @return 安裝成功返回true，安裝失敗返回false。
 */
public boolean install(String apkPath) {
    boolean result = false;
DataOutputStream dataOutputStream = null;
BufferedReader errorStream = null;
    try {
        // 申請su許可權
Process process = Runtime.getRuntime
 
().exec("su");
dataOutputStream = new DataOutputStream(process.getOutputStream());
// 執行pm install命令
String command = "pm install -r " + apkPath + "\n";
dataOutputStream.write(command.getBytes(Charset.forName("utf-8")));
dataOutputStream.flush();
dataOutputStream.writeBytes("exit\n");
dataOutputStream.flush();
 
process.waitFor();
errorStream = new BufferedReader(new InputStreamReader(process.getErrorStream()));
String msg = "";
String line;
// 讀取命令的執行結果
while ((line = errorStream.readLine()) != null) {
            msg += line;
}
        Log.d("TAG", "install msg is " + msg);
// 如果執行結果中包含Failure字樣就認為是安裝失敗，否則就認為安裝成功
 
if (!msg.contains("Failure")) {
            result = true;
}
    } catch (Exception e) {
        Log.e("TAG", e.getMessage(), e);
} finally {
        try {
            if (dataOutputStream != null) {
                dataOutputStream.close();
}
            if (errorStream != null) {
                errorStream.close();
}
        } catch (IOException e) {
            Log.e("TAG", e.getMessage(), e);
}
    }
    return result;
}