Android 重新启动活动时未保留网格视图状态

我面临一个在方向更改时保留栅格视图状态的问题。最初，创建栅格视图时，仅加载9个图像。当用户滚动网格视图时，更多的图像被添加到网格视图中，这非常有效。单击网格视图上的图像时，会打开另一个在图像视图上显示图像的活动。现在，当我返回网格活动时，按下“上一步”按钮，网格视图将失去其状态，这意味着，现在活动将重新开始，仅显示加载的前9个图像

使用通用映像下载程序库下载映像

我已经在清单文件中指定了

android:configChanges=“keyboardHidden | orientation”

覆盖了

onConfigurationChanged

和

onretainonconfigurationinstance

。 网格活动：

调试之后，我发现onDestroy（）方法是在退出活动时调用的，而不仅仅是onPause（）。我似乎真的找不出这里有什么问题。任何帮助都将不胜感激

谢谢

/** The initial activity class which instantiates a gallery */
    public class GalleryActivity extends Activity {
    private GridView gridview;
    private LinearLayout linlaProgressBar;
    private int count = 9;
    private GridImageAdapter gridImageAdapter;
    private boolean loadMore = false;
    private Vector<Image> imageDataList;
    private Context context;
    private int width = 0;
    private int height = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i("ACTIVITY ", "ON CREATE");
        setContentView(R.layout.grid_layout);
        linlaProgressBar = (LinearLayout) findViewById(R.id.linlaProgressBar);
        gridview = (GridView) findViewById(R.id.gridview);
        gridview.setPadding(10, 10, 10, 10);

        imageDataList = new Vector<Image>(100);
        setImageData();
        context = this;

        WindowManager winManager = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        int screenWidth = winManager.getDefaultDisplay().getWidth();
        int screenHeight = winManager.getDefaultDisplay().getHeight();
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
            width = (int) (screenWidth * 0.45);
            height = (int) (screenHeight * 0.3);
        } else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
            width = (int) (screenWidth * 0.25);
            height = (int) (screenHeight * 0.40);
        }

        // Check if old activity exist
        GalleryActivity oldActivity = (GalleryActivity) getLastNonConfigurationInstance();
        if (oldActivity == null) {
            gridImageAdapter = new GridImageAdapter(this);
            /* set the urls from which the image is to be loaded */
            gridImageAdapter.addURL(imageDataList);
            /* count is the initial number of images to be loaded */
            gridImageAdapter.AddItems(count);

            gridview.setColumnWidth(width);
            gridImageAdapter.setDimensions(width, height);

            /* set the adapter to the grid view */
            gridview.setAdapter(gridImageAdapter);
        } else {

            gridImageAdapter = oldActivity.gridImageAdapter;
            gridview.setColumnWidth(width);
            gridImageAdapter.setDimensions(width, height);
            gridview.setAdapter(gridImageAdapter);

        }

        linlaProgressBar.setVisibility(View.GONE);

        gridview.setOnScrollListener(new OnScrollListener() {

            public void onScrollStateChanged(AbsListView view, int scrollState) {
                loadMore = true;
                if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
                    linlaProgressBar.setVisibility(View.GONE);
                }
            }

            public void onScroll(AbsListView view, int firstVisibleItem,
                    int visibleItemCount, int totalItemCount) {

                int lastInScreen = firstVisibleItem + visibleItemCount;

                GridImageAdapter gridAdaptr = (GridImageAdapter) gridview
                        .getAdapter();
                int maxLimit = gridAdaptr.getCount();
                if (maxLimit >= (imageDataList.size())) {
                    loadMore = false;
                    linlaProgressBar.setVisibility(View.GONE);
                } else if (lastInScreen == totalItemCount && (loadMore)) {
                    linlaProgressBar.setVisibility(View.VISIBLE);
                    /*
                     * To check that the number of items added never exceeds the
                     * total images count
                     */
                    int threshHold = maxLimit + visibleItemCount;

                    if ((threshHold) > imageDataList.size()) {
                        int newVisibleItemCount = visibleItemCount
                                - (threshHold - imageDataList.size());
                        gridAdaptr.AddItems(newVisibleItemCount);

                    } else {
                        gridAdaptr.AddItems(visibleItemCount);
                    }
                    gridAdaptr.notifyDataSetChanged();
                    loadMore = false;
                }

            }

        });
        gridview.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View view,
                    int position, long id) {
                Log.i("ITEM", "CLICKED");
                Intent intent = new Intent(GalleryActivity.this,
                        HSMainActivity.class)
                        .setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT
                                | Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.putExtra("itemPosition", position);
                intent.putExtra("imageurl", imageDataList.get(position)
                        .getUrl());
                context.startActivity(intent);

            }
        });
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {

        super.onConfigurationChanged(newConfig);
    }

    @Override
    public Object onRetainNonConfigurationInstance() {
        Log.i("ACTIVITY", "ON RETAIN CONFIGURATION");
        return this;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_gallery, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.menu_settings:

            return true;

        default:
            return super.onOptionsItemSelected(item);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("ACTIVITY", "ONDESTROY");
        int count = gridview.getCount();
        for (int i = 0; i < count; i++) {

            final ViewGroup v = (ViewGroup) gridview.getChildAt(i);
            if (v != null) {
                v.removeAllViews();
            }

        }

    }

    @Override
    protected void onPause() {
        Log.i("ACTIVITY", "on PAUSE");
        super.onPause();
    }

    @Override
    protected void onResume() {
        Log.i("ACTIVITY", "ON RESUME");
        super.onResume();
    }

    /* get the image data */
    public void setImageData() {

        ImageData imageData = new ImageData();
        imageDataList.clear();
        imageDataList = imageData.getImageData();
    }
}

/**实例化库的初始活动类*/
公共类GalleryActivity扩展了活动{
私有GridView GridView；
私人线路布局linlaProgressBar；
私有整数计数=9；
私有GridImageAdapter GridImageAdapter；
私有布尔loadMore=false；
专用矢量图像数据表；
私人语境；
私有整数宽度=0；
私有整数高度=0；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
Log.i（“活动”、“创建时”）；
setContentView（R.layout.grid_layout）；
linlaProgressBar=（LinearLayout）findViewById（R.id.linlaProgressBar）；
gridview=（gridview）findViewById（R.id.gridview）；
设置填充（10,10,10,10）；
imageDataList=新向量（100）；
setImageData（）；
上下文=这个；
WindowManager winManager=（WindowManager）上下文
.getSystemService（Context.WINDOW\u服务）；
int screenWidth=winManager.getDefaultDisplay（）.getWidth（）；
int screenHeight=winManager.getDefaultDisplay（）.getHeight（）；
if（getResources（）.getConfiguration（）.orientation==Configuration.orientation\u纵向）{
宽度=（整数）（屏幕宽度*0.45）；
高度=（整数）（屏幕高度*0.3）；
}else if（getResources（）.getConfiguration（）.orientation==Configuration.orientation\u横向）{
宽度=（整数）（屏幕宽度*0.25）；
高度=（整数）（屏幕高度*0.40）；
}
//检查是否存在旧活动
GalleryActivity oldActivity=（GalleryActivity）GetLastNonConfiguration实例（）；
if（oldActivity==null）{
gridImageAdapter=新的gridImageAdapter（此）；
/*设置要从中加载图像的URL*/
addURL（imageDataList）；
/*count是要加载的图像的初始数量*/
gridImageAdapter.AddItems（计数）；
gridview.setColumnWidth（宽度）；
gridImageAdapter.setDimensions（宽度、高度）；
/*将适配器设置为网格视图*/
setAdapter（gridImageAdapter）；
}否则{
gridImageAdapter=oldActivity.gridImageAdapter；
gridview.setColumnWidth（宽度）；
gridImageAdapter.setDimensions（宽度、高度）；
setAdapter（gridImageAdapter）；
}
linlaProgressBar.setVisibility（View.GONE）；
setOnScrollListener（新的OnScrollListener（）{
公共无效onScrollStateChanged（AbsListView视图，int scrollState）{
loadMore=true；
if（scrollState==AbsListView.OnScrollListener.SCROLL\u STATE\u IDLE）{
linlaProgressBar.setVisibility（View.GONE）；
}
}
public void onScroll（AbsListView视图，int firstVisibleItem，
int visibleItemCount，int totalItemCount）{
int lastInScreen=firstVisibleItem+visibleItemCount；
GridImageAdapter=（GridImageAdapter）gridview
.getAdapter（）；
int maxLimit=gridAdapter.getCount（）；
如果（maxLimit>=（imageDataList.size（））{
loadMore=false；
linlaProgressBar.setVisibility（View.GONE）；
}否则如果（lastInScreen==totalItemCount&&（loadMore））{
linlaProgressBar.setVisibility（View.VISIBLE）；
/*
*检查添加的项目数是否从未超过
*图像总数
*/
int threshold=maxLimit+visibleItemCount；
if（（阈值）>imageDataList.size（））{
int newVisibleItemCount=visibleItemCount
-（threshold-imageDataList.size（））；
GridAdapter.AddItems（newVisibleItemCount）；
}否则{
GridAdapter.AddItems（visibleItemCount）；
}
GridAdapter.notifyDataSetChanged（）；
loadMore=false；
}
}
});
setOnItemClickListener（新的OnItemClickListener（）{
public void onItemClick（AdapterView arg0，视图，
内部位置，长id）{
Log.i（“项目”，“点击”）；
意向意向=新意向（GalleryActivity.this，
hsmain（活动类）
.setFlags（Intent.FLAG\u活动\u重新排序\u至\u前端
|意图。标记活动（新任务）；
意图
 /** Adapter for the GridView class which extends the BaseAdapter */
 public class GridImageAdapter extends BaseAdapter {
private Context context;
private LayoutInflater layoutInflater;
private int width = 0;
private int height = 0;
private int textFactor = 35;
private int mCount = 0;
private DisplayImageOptions options;
private Vector<Image> images;

public GridImageAdapter(Context mContext) {

    context = mContext;
    layoutInflater = LayoutInflater.from(context);
    images = new Vector<Image>(100);
    /* options for the image loader */
    options = new DisplayImageOptions.Builder()
            .showStubImage(R.drawable.loading)
            .showImageForEmptyUri(R.drawable.loading)
            .showImageOnFail(R.drawable.not_found).cacheInMemory()
            .cacheOnDisc().resetViewBeforeLoading()
            .bitmapConfig(Bitmap.Config.RGB_565).build();

}

public int getCount() {

    return getTotalCount();
}

public Object getItem(int position) {

    return position;
}

public long getItemId(int position) {

    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {

    ImageView imageView = null;
    TextView textView = null;
    int imagePadding = 10;
    if (convertView == null) {
        convertView = new View(context);
        convertView = layoutInflater.inflate(R.layout.grid_cell_layout,
                null);
        convertView.setPadding(3, 0, imagePadding - 1, imagePadding);
        convertView.setBackgroundResource(R.drawable.background_shadow);
        convertView
                .setLayoutParams(new GridView.LayoutParams(width, height));

    } else {
        convertView = (View) convertView;

    }

    imageView = (ImageView) convertView.findViewById(R.id.image);
    // Toast.makeText(context, "Width:" + width + "Height:" + height,
    // Toast.LENGTH_SHORT).show();
    /** height has to be reduced to display the text */
    imageView.setLayoutParams(new LinearLayout.LayoutParams(width, height
            - textFactor));
    imageView.setAdjustViewBounds(true);
    imageView.setScaleType(ImageView.ScaleType.FIT_XY);

    /** Universal Image Loader is used to load the images */
    textView = (TextView) convertView.findViewById(R.id.title);
    textView.setText(images.get(position).getName());
    /** Check if the file exists in the disc cache */
    if (ImageLoader.getInstance().getDiscCache()
            .get(images.get(position).getUrl()).exists()) {
        String imageUri = "file://"
                + ImageLoader.getInstance().getDiscCache()
                        .get(images.get(position).getUrl())
                        .getAbsolutePath(); // from SD
        // card
        // Log.i("file path", imageUri);
        ImageLoader.getInstance()
                .displayImage(imageUri, imageView, options);
        // Log.i("Image exists in cache", "!!!");
    } else {
        ImageLoader.getInstance().displayImage(
                images.get(position).getUrl(), imageView, options);
    }

    textView.setTextColor(Color.BLACK);
    return convertView;
}

public int AddItems(int count) {

    mCount = mCount + count;
    return mCount;
}

public int getTotalCount() {

    return mCount;

}

public void addURL(Vector<Image> imageDataList) {

    images.clear();
    images = imageDataList;

}


public void setDimensions(int screenWidth, int screenHeight) {

    width = screenWidth;
    height = screenHeight;

}

 public class ImageData {
    public Vector<Image> getImageData() {

    Vector<Image> imageData = new Vector<Image>(100);
        Image imageData0 = new Image();
    imageData0.setName("image 0");
    imageData0.setUrl("https://lh6.googleusercontent.com/-jZgveEqb6pg/T3R4kXScycI/AAAAAAAAAE0/xQ7CvpfXDzc/s1024/sample_image_01.jpg");
    imageData.add(imageData0);

    Image imageData1 = new Image();
    imageData1.setName("image 1");
    imageData1.setUrl("https://lh4.googleusercontent.com/-K2FMuOozxU0/T3R4lRAiBTI/AAAAAAAAAE8/a3Eh9JvnnzI/s1024/sample_image_02.jpg");
    imageData.add(imageData1);

    Image imageData2 = new Image();
    imageData2.setName("image 2");
    imageData2.setUrl("https://lh5.googleusercontent.com/-SCS5C646rxM/T3R4l7QB6xI/AAAAAAAAAFE/xLcuVv3CUyA/s1024/sample_image_03.jpg");
    imageData.add(imageData2);

    Image imageData3 = new Image();
    imageData3.setName("image 3");
    imageData3.setUrl("https://lh6.googleusercontent.com/-f0NJR6-_Thg/T3R4mNex2wI/AAAAAAAAAFI/45oug4VE8MI/s1024/sample_image_03.jpg");
    imageData.add(imageData3);

    Image imageData4 = new Image();
    imageData4.setName("image 4");
    imageData4.setUrl("https://lh3.googleusercontent.com/-n-xcJmiI0pg/T3R4mkSchHI/AAAAAAAAAFU/EoiNNb7kk3A/s1024/sample_image_04.jpg");
    imageData.add(imageData4);

    Image imageData5 = new Image();
    imageData5.setName("image 5");
    imageData5.setUrl("https://lh3.googleusercontent.com/-n-xcJmiI0pg/T3R4mkSchHI/AAAAAAAAAFU/EoiNNb7kk3A/s1024/sample_image_05.jpg");
    imageData.add(imageData5);

    Image imageData6 = new Image();
    imageData6.setName("image 6");
    imageData6.setUrl("https://lh3.googleusercontent.com/-X43vAudm7f4/T3R4nGSChJI/AAAAAAAAAFk/3bna6D-2EE8/s1024/sample_image_06.jpg");
    imageData.add(imageData6);

    Image imageData7 = new Image();
    imageData7.setName("image 7");
    imageData7.setUrl("https://lh5.googleusercontent.com/-MpZneqIyjXU/T3R4nuGO1aI/AAAAAAAAAFg/r09OPjLx1ZY/s1024/sample_image_07.jpg");
    imageData.add(imageData7);

    Image imageData8 = new Image();
    imageData8.setName("image 8");
    imageData8.setUrl("https://lh6.googleusercontent.com/-ql3YNfdClJo/T3XvW9apmFI/AAAAAAAAAL4/_6HFDzbahc4/s1024/sample_image_08.jpg");
    imageData.add(imageData8);

    Image imageData9 = new Image();
    imageData9.setName("image 9");
    imageData9.setUrl("https://lh5.googleusercontent.com/-Pxa7eqF4cyc/T3R4oasvPEI/AAAAAAAAAF0/-uYDH92h8LA/s1024/sample_image_09.jpg");
    imageData.add(imageData9);

    Image imageData10 = new Image();
    imageData10.setName("image 10");
    imageData10.setUrl("https://lh4.googleusercontent.com/-Li-rjhFEuaI/T3R4o-VUl4I/AAAAAAAAAF8/5E5XdMnP1oE/s1024/sample_image_10.jpg");
    imageData.add(imageData10);

    Image imageData11 = new Image();
    imageData11.setName("image 11");
    imageData11.setUrl("https://lh5.googleusercontent.com/-_HU4fImgFhA/T3R4pPVIwWI/AAAAAAAAAGA/0RfK_Vkgth4/s1024/sample_image_11.jpg");
    imageData.add(imageData11);

    Image imageData12 = new Image();
    imageData12.setName("image 12");
    imageData12.setUrl("https://lh6.googleusercontent.com/-0gnNrVjwa0Y/T3R4peGYJwI/AAAAAAAAAGU/uX_9wvRPM9I/s1024/sample_image_12.jpg");
    imageData.add(imageData12);

    Image imageData13 = new Image();
    imageData13.setName("image 13");
    imageData13.setUrl("https://lh3.googleusercontent.com/-HBxuzALS_Zs/T3R4qERykaI/AAAAAAAAAGQ/_qQ16FaZ1q0/s1024/sample_image_13.jpg");
    imageData.add(imageData13);

    Image imageData14 = new Image();
    imageData14.setName("image 14");
    imageData14.setUrl("https://lh4.googleusercontent.com/-cKojDrARNjQ/T3R4qfWSGPI/AAAAAAAAAGY/MR5dnbNaPyY/s1024/sample_image_14.jpg");
    imageData.add(imageData14);

    Image imageData15 = new Image();
    imageData15.setName("image 15");
    imageData15.setUrl("https://lh3.googleusercontent.com/-WujkdYfcyZ8/T3R4qrIMGUI/AAAAAAAAAGk/277LIdgvnjg/s1024/sample_image_15.jpg");
    imageData.add(imageData15);

    Image imageData16 = new Image();
    imageData16.setName("image 16");
    imageData16.setUrl("https://lh6.googleusercontent.com/-FMHR7Vy3PgI/T3R4rOXlEKI/AAAAAAAAAGs/VeXrDNDBkaw/s1024/sample_image_16.jpg");
    imageData.add(imageData16);

    Image imageData17 = new Image();
    imageData17.setName("image 17");
    imageData17.setUrl("https://lh4.googleusercontent.com/-mrR0AJyNTH0/T3R4rZs6CuI/AAAAAAAAAG0/UE1wQqCOqLA/s1024/sample_image_17.jpg");
    imageData.add(imageData17);

    Image imageData18 = new Image();
    imageData18.setName("image 18");
    imageData18.setUrl("https://lh6.googleusercontent.com/-z77w0eh3cow/T3R4rnLn05I/AAAAAAAAAG4/BaerfWoNucU/s1024/sample_image_18.jpg");
    imageData.add(imageData18);

    Image imageData19 = new Image();
    imageData19.setName("image 19");
    imageData19.setUrl("https://lh5.googleusercontent.com/-aWVwh1OU5Bk/T3R4sAWw0yI/AAAAAAAAAHE/4_KAvJttFwA/s1024/sample_image_19.jpg");
    imageData.add(imageData19);

    Image imageData20 = new Image();
    imageData20.setName("image 20");
    imageData20.setUrl("https://lh6.googleusercontent.com/-q-js52DMnWQ/T3R4tZhY2sI/AAAAAAAAAHM/A8kjp2Ivdqg/s1024/sample_image_20.jpg");
    imageData.add(imageData20);

    return imageData;
}