Java ArrayIndexOutOfBounds异常，即使在异常处理之后也是如此_Java_Android_Exception Handling_File Handling

Java ArrayIndexOutOfBounds异常，即使在异常处理之后也是如此

java android exception-handling

Java ArrayIndexOutOfBounds异常，即使在异常处理之后也是如此,java,android,exception-handling,file-handling,Java,Android,Exception Handling,File Handling,所以我在一个片段中填充了一个网格视图，我有一个微调器，其中列出了文件夹选项每当我选择一个没有文件的文件夹时，应用程序就会崩溃，导致ArrayIndexOutOfBounds异常 FATAL EXCEPTION: main Process: manika.aditya.ekayana, PID: 13405 ja

所以我在一个片段中填充了一个网格视图，我有一个微调器，其中列出了文件夹选项

每当我选择一个没有文件的文件夹时，应用程序就会崩溃，导致ArrayIndexOutOfBounds异常

FATAL EXCEPTION: main
                         Process: manika.aditya.ekayana, PID: 13405
                                                                   java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
                                                                       at java.util.ArrayList.get(ArrayList.java:411)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment.setupGridView(GalleryFragment.java:170)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment.access$300(GalleryFragment.java:37)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment$3.onItemSelected(GalleryFragment.java:142)

private void setupGridView(String selectedDirectory) throws ArrayIndexOutOfBoundsException {
    Log.d(TAG, "setupGridView: directory chosen: " + selectedDirectory);
    final ArrayList<String> imgURLs = FileSearch.getFilePaths(selectedDirectory);

    //set the grid column width
    int gridWidth = getResources().getDisplayMetrics().widthPixels;
    int imageWidth = gridWidth/NUM_GRID_COLUMNS;
    gridView.setColumnWidth(imageWidth);

    //use the grid adapter to adapter the images to gridview
    GridImageAdapter adapter = new GridImageAdapter(getActivity(), R.layout.layout_grid_imageview, mAppend, imgURLs);
    gridView.setAdapter(adapter);

    //set the first image to be displayed when the activity fragment view is inflated

    try{

        setImage(imgURLs.get(0), galleryImage, mAppend);

    }

    catch (ArrayIndexOutOfBoundsException aioobe){}

    mSelectedImage = imgURLs.get(0);
    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));

            setImage(imgURLs.get(position), galleryImage, mAppend);
            mSelectedImage = imgURLs.get(position);
        }
    });

}

这是我用来填充GridView的函数

正如您所看到的，它抛出了一个ArrayIndexOutOfBounds异常

FATAL EXCEPTION: main
                         Process: manika.aditya.ekayana, PID: 13405
                                                                   java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
                                                                       at java.util.ArrayList.get(ArrayList.java:411)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment.setupGridView(GalleryFragment.java:170)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment.access$300(GalleryFragment.java:37)
                                                                       at manika.aditya.ekayana.Share.GalleryFragment$3.onItemSelected(GalleryFragment.java:142)

private void setupGridView(String selectedDirectory) throws ArrayIndexOutOfBoundsException {
    Log.d(TAG, "setupGridView: directory chosen: " + selectedDirectory);
    final ArrayList<String> imgURLs = FileSearch.getFilePaths(selectedDirectory);

    //set the grid column width
    int gridWidth = getResources().getDisplayMetrics().widthPixels;
    int imageWidth = gridWidth/NUM_GRID_COLUMNS;
    gridView.setColumnWidth(imageWidth);

    //use the grid adapter to adapter the images to gridview
    GridImageAdapter adapter = new GridImageAdapter(getActivity(), R.layout.layout_grid_imageview, mAppend, imgURLs);
    gridView.setAdapter(adapter);

    //set the first image to be displayed when the activity fragment view is inflated

    try{

        setImage(imgURLs.get(0), galleryImage, mAppend);

    }

    catch (ArrayIndexOutOfBoundsException aioobe){}

    mSelectedImage = imgURLs.get(0);
    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));

            setImage(imgURLs.get(position), galleryImage, mAppend);
            mSelectedImage = imgURLs.get(position);
        }
    });

}

这是目录/文件搜索方法，以防万一

directories = new ArrayList<>();

}尝试更改此设置

try{

    setImage(imgURLs.get(0), galleryImage, mAppend);

}

catch (ArrayIndexOutOfBoundsException aioobe){}

mSelectedImage = imgURLs.get(0);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));

        setImage(imgURLs.get(position), galleryImage, mAppend);
        mSelectedImage = imgURLs.get(position);
    }
});

试试看{
setImage（imgURLs.get（0）、galleryImage、mAppend）；
}
catch（ArrayIndexOutOfBoundsException aioobe）{}
mSelectedImage=imgURLs.get（0）；
setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
Log.d（标记“onItemClick:选择了一个图像：”+imgURLs.get（位置））；
setImage（imgURLs.get（位置）、galleryImage、mAppend）；
mSelectedImage=imgURLs.get（位置）；
}
});

进入这个

try{
    setImage(imgURLs.get(0), galleryImage, mAppend);
    mSelectedImage = imgURLs.get(0);
}
catch (ArrayIndexOutOfBoundsException aioobe){}

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        try {
            Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));
            setImage(imgURLs.get(position), galleryImage, mAppend);
            mSelectedImage = imgURLs.get(position);
        } 
        catch (ArrayIndexOutOfBoundsException aioobe){}
    }
});

试试看{
setImage（imgURLs.get（0）、galleryImage、mAppend）；
mSelectedImage=imgURLs.get（0）；
}
catch（ArrayIndexOutOfBoundsException aioobe）{}
setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
试一试{
Log.d（标记“onItemClick:选择了一个图像：”+imgURLs.get（位置））；
setImage（imgURLs.get（位置）、galleryImage、mAppend）；
mSelectedImage=imgURLs.get（位置）；
} 
catch（ArrayIndexOutOfBoundsException aioobe）{}
}
});

在从imgURLS获取索引之前，请检查imgURLS是否包含一些值

if(imgURLs.size()>0){              
    try{


                        setImage(imgURLs.get(0), galleryImage, mAppend);



                    mSelectedImage = imgURLs.get(0);
                    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));

                            setImage(imgURLs.get(position), galleryImage, mAppend);
                            mSelectedImage = imgURLs.get(position);
                        }
                    });

             catch (Exception EX){
            }
    }
else{
//No image url
}

if（imgURLs.size（）>0）{
试一试{
setImage（imgURLs.get（0）、galleryImage、mAppend）；
mSelectedImage=imgURLs.get（0）；
setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
Log.d（标记“onItemClick:选择了一个图像：”+imgURLs.get（位置））；
setImage（imgURLs.get（位置）、galleryImage、mAppend）；
mSelectedImage=imgURLs.get（位置）；
}
});
捕获（例外情况除外）{
}
}
否则{
//没有图像url
}

}

您在哪一行获得此异常？它在我发布的日志中，您认为

mSelectedImage=imgURLs.get（0）是什么？（提示：跟随stacktrace）仍然是相同的错误致命异常：主进程：manika.aditya.ekayana，PID:20316 java.lang.IndexOutOfBoundsException:Index:0，java.util.ArrayList.get（ArrayList.java:411）上的Size:0
请求原谅而不是许可在python中得到了很好的考虑，而在java中则更少。例外是昂贵的，所以考虑测试你的条件，而不是尝试…接住，问题解决了final ArrayList imgURLs=FileSearch.getfilepath（selectedDirectory）；IMGurlSize=imgURLs.size（）然后我完全按照你说的做了，嗯，我在else语句中加了一个祝酒词。你为什么认为你需要尝试一下。。。捕获？以防在设置映像或单击映像时出现任何异常
if(imgURLs.size()>0){              
    try{


                        setImage(imgURLs.get(0), galleryImage, mAppend);



                    mSelectedImage = imgURLs.get(0);
                    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            Log.d(TAG, "onItemClick: selected an image: " + imgURLs.get(position));

                            setImage(imgURLs.get(position), galleryImage, mAppend);
                            mSelectedImage = imgURLs.get(position);
                        }
                    });

             catch (Exception EX){
            }
    }
else{
//No image url
}