Android 使GridView从特定文件夹拍摄图像

我是android应用程序制作的新手，我还是一个有点知识的初学者。我一直在尝试制作一款android应用程序，它的工作原理类似于画廊，但它只在特定文件夹下显示图像。对于UI，我只从一个

GridView

（或者从后者派生的

TwoWayGridView

）开始，并且一直试图让这个

GridView

从这个文件夹获取其内容

我创建了此文件夹并将图像复制到其中进行测试，但失败。没有显示图像。另外，我对

光标

和

列表适配器

不是很熟悉。有些我确信是正确的事情是权限、清单和活动的布局。此外，我相信我的问题是关于

URI

s。请在下面检查我的代码：

一些名称：

Uri contentUri;

Cursor mImageCursor;
TwoWayGridView mImageGrid;
ListAdapter mAdapter;

String sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gallery);

        File motherDirectory = new File(sdCard+"/Favory");
        if(!motherDirectory.exists()){
            motherDirectory.mkdir();
        }


        MediaScannerConnection.scanFile(this, new String[]{motherDirectory.getAbsolutePath()}   ,null, new MediaScannerConnection.OnScanCompletedListener() {

            @Override
            public void onScanCompleted(String path, Uri uri) {
                // TODO Auto-generated method stub
                contentUri = uri ;
                initGrid(uri);
            }
        });



    }

private void initGrid(Uri folderUri) {



mImageCursor = this.getContentResolver().query(folderUri,
        ImageThumbnailAdapter.IMAGE_PROJECTION, null, null,
        MediaStore.Images.ImageColumns.DISPLAY_NAME);
mImageGrid = (TwoWayGridView) findViewById(R.id.gridview);
mAdapter = new ImageThumbnailAdapter(this, mImageCursor);
mImageGrid.setAdapter(mAdapter);

mImageGrid.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(TwoWayAdapterView<?> parent, View v, int position, long id) {
        Log.i(TAG, "showing image: " + mImageCursor.getString(ImageThumbnailAdapter.IMAGE_NAME_COLUMN));
        Uri uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    }
});
}

onCreate方法：

Uri contentUri;

Cursor mImageCursor;
TwoWayGridView mImageGrid;
ListAdapter mAdapter;

String sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gallery);

        File motherDirectory = new File(sdCard+"/Favory");
        if(!motherDirectory.exists()){
            motherDirectory.mkdir();
        }


        MediaScannerConnection.scanFile(this, new String[]{motherDirectory.getAbsolutePath()}   ,null, new MediaScannerConnection.OnScanCompletedListener() {

            @Override
            public void onScanCompleted(String path, Uri uri) {
                // TODO Auto-generated method stub
                contentUri = uri ;
                initGrid(uri);
            }
        });



    }

private void initGrid(Uri folderUri) {



mImageCursor = this.getContentResolver().query(folderUri,
        ImageThumbnailAdapter.IMAGE_PROJECTION, null, null,
        MediaStore.Images.ImageColumns.DISPLAY_NAME);
mImageGrid = (TwoWayGridView) findViewById(R.id.gridview);
mAdapter = new ImageThumbnailAdapter(this, mImageCursor);
mImageGrid.setAdapter(mAdapter);

mImageGrid.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(TwoWayAdapterView<?> parent, View v, int position, long id) {
        Log.i(TAG, "showing image: " + mImageCursor.getString(ImageThumbnailAdapter.IMAGE_NAME_COLUMN));
        Uri uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    }
});
}

initGrid（Uri）方法：

Uri contentUri;

Cursor mImageCursor;
TwoWayGridView mImageGrid;
ListAdapter mAdapter;

String sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gallery);

        File motherDirectory = new File(sdCard+"/Favory");
        if(!motherDirectory.exists()){
            motherDirectory.mkdir();
        }


        MediaScannerConnection.scanFile(this, new String[]{motherDirectory.getAbsolutePath()}   ,null, new MediaScannerConnection.OnScanCompletedListener() {

            @Override
            public void onScanCompleted(String path, Uri uri) {
                // TODO Auto-generated method stub
                contentUri = uri ;
                initGrid(uri);
            }
        });



    }

private void initGrid(Uri folderUri) {



mImageCursor = this.getContentResolver().query(folderUri,
        ImageThumbnailAdapter.IMAGE_PROJECTION, null, null,
        MediaStore.Images.ImageColumns.DISPLAY_NAME);
mImageGrid = (TwoWayGridView) findViewById(R.id.gridview);
mAdapter = new ImageThumbnailAdapter(this, mImageCursor);
mImageGrid.setAdapter(mAdapter);

mImageGrid.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(TwoWayAdapterView<?> parent, View v, int position, long id) {
        Log.i(TAG, "showing image: " + mImageCursor.getString(ImageThumbnailAdapter.IMAGE_NAME_COLUMN));
        Uri uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
    }
});
}

private void initGrid（Uri folderUri）{
mImageCursor=this.getContentResolver（）.query（folderUri，
ImageThumbnailAdapter.IMAGE_投影，null，null，
MediaStore.Images.ImageColumns.DISPLAY_NAME）；
mImageGrid=（双向gridview）findViewById（R.id.gridview）；
mAdapter=新的ImageThumbnailAdapter（此为mImageCursor）；
设置适配器（mAdapter）；
setOnItemClickListener（新的OnItemClickListener（）{
public void onItemClick（双向适配器视图父视图、视图v、整型位置、长id）{
Log.i（标记，“显示图像：”+mImageCursor.getString（ImageThumbnailAdapter.image\u NAME\u列））；
Uri Uri=ContentURI.withAppendedId（MediaStore.Images.Media.EXTERNAL\u CONTENT\u Uri，id）；
意图=新意图（Intent.ACTION\u视图，uri）；
星触觉（意向）；
}
});
}

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谢谢你的帮助，如果有更简单的替代方法，请告诉我，我现在更关心结果而不是方法。如果您需要任何信息，请在下面的评论中告诉我。再次感谢

要读取文件夹的文件，可以使用此功能（从post）：

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有关如何使用此库的更多信息，您可以查看示例，其中有一个示例使用grid view gridView来读取文件夹的文件，您可以使用此功能（从post）：

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有关如何使用此库的更多信息，您可以查看示例，其中有一个使用grid view gridView的示例

此方法是递归的吗？此方法是递归的吗？