Android 5.0以上，除了在 AndroidManifest.xml 中加 讀寫權限外

<uses-permission?android:name="android.permission.INTERNET"/>
<uses-permission?android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission?android:name="android.permission.READ_EXTERNAL_STORAGE"/>

還需要在代碼中增加手動增加權限申請的代碼：

public??static?void?verifyStoragePerssion(Activity?activity){
????int?writePerssion?=?ActivityCompat.checkSelfPermission(activity,Manifest.permission.WRITE_EXTERNAL_STORAGE);
????int?readPerssion?=?ActivityCompat.checkSelfPermission(activity,?Manifest.permission.READ_EXTERNAL_STORAGE);
????if(writePerssion?!=?PackageManager.PERMISSION_GRANTED?||?readPerssion?!=?PackageManager.PERMISSION_GRANTED){
????????ActivityCompat.requestPermissions(activity,?PERMISSIONS_STORGE,?REQUEST_EXTERNAL_STORAGE);
????}
}

其中 REQUEST_EXTERNAL_STORAGE 和??PERMISSIONS_STORGE 定義如下：

private??static?final?int?REQUEST_EXTERNAL_STORAGE?=?1;

private??static?String[]?PERMISSIONS_STORGE?=?{
????????Manifest.permission.READ_EXTERNAL_STORAGE,
????????Manifest.permission.WRITE_EXTERNAL_STORAGE
};