<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.xxx">
    <uses-permission android:name="android.permission.INTERNET"/>
    ...
</manifest>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.xxx">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <!-- 下面這行代碼也非常重要，千萬(wàn)不要忘記加-->
    <application
    ...
    android:requestLegacyExternalStorage="true">...</application>
</manifest>

/**
     * 檢查app是否擁有存儲(chǔ)權(quán)限，如果沒(méi)有的話，提醒用戶開(kāi)啟權(quán)限
     */
    public void handlePermission() {
    	// 檢查是否開(kāi)啟 Manifest.permission.xxx
    	// (xxx 為權(quán)限，根據(jù)自己需求添加）
        if (ActivityCompat.checkSelfPermission(this, 
                Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "Permission has been allowed", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "ask for permission",Toast.LENGTH_SHORT).show();
            // 請(qǐng)求權(quán)限
            ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
            Log.d(TAG, "handlePermission: has aksed");
        }
    }