imageDownload.java

DJIDrone.getDjiCamera().setCameraMode(mode, new DJIExecuteResultCallback(){

    @Override
    public void onResult(DJIError mErr)
    {
        // TODO Auto-generated method stub
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                enterMultipleView();
            }
        },1000);
    }
});

public void enterMultipleView() {
    DJIDrone.getDjiCamera().enterMultiplePreviewMode(new DJIExecuteResultCallback(){
        @Override
        public void onResult(DJIError mErr)
        {
           // TODO Auto-generated method stub
            handler.post(new Runnable() {
                @Override
                public void run() {
                    enterMultipleSelect();
                }
            });
        }
    });
}
//enter multiple select mode
public void enterMultipleSelect() {
    DJIDrone.getDjiCamera().enterMultipleEditMode(new DJIExecuteResultCallback(){
        @Override
        public void onResult(DJIError mErr)
        {
            // TODO Auto-generated method stub
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    selectAll();
                }
            },2000);
        }
        });
}
//select all
public void selectAll() {
    DJIDrone.getDjiCamera().selectAllFiles(new DJIExecuteResultCallback(){
        @Override
        public void onResult(DJIError mErr)
        {
            // TODO Auto-generated method stub
            handler.post(new Runnable() {
                @Override
                public void run() {
                    downloadAll();
                }
            });
        }
        });
    }
//download all
public void downloadAll() {
    try {
        Thread.sleep(500);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    DJIDrone.getDjiCamera().downloadAllSelectedFiles("Altizure",new DJIFileDownloadCallBack() {
            @Override
 ...
 //Following is the same as the one in Demo project