Example usage for android.support.v4.content ContentResolverCompat query

Introduction

In this page you can find the example usage for android.support.v4.content ContentResolverCompat query.

Prototype

public static Cursor query(ContentResolver resolver, Uri uri, String[] projection, String selection,
        String[] selectionArgs, String sortOrder, CancellationSignal cancellationSignal) 

Source Link

Document

Query the given URI, returning a Cursor over the result set with optional support for cancellation.

Usage

From source file:cn.tangxb.imageselector.PhotoModelTaskLoader.java

@Override
public ArrayList<PhotoModel> loadInBackground() {
    synchronized (this) {
        if (isLoadInBackgroundCanceled()) {
            throw new OperationCanceledException();
        }/*ww w .j a va2 s  .c  o  m*/
        mCancellationSignal = new CancellationSignal();
    }
    try {
        Cursor cursor = ContentResolverCompat.query(getContext().getContentResolver(),
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                new String[] { MediaStore.Images.ImageColumns.DATA, MediaStore.Images.ImageColumns.DATE_ADDED,
                        MediaStore.Images.ImageColumns.SIZE },
                null, null, MediaStore.Images.ImageColumns.DATE_ADDED, mCancellationSignal);
        if (cursor != null) {
            try {
                // Ensure the cursor window is filled.
                cursor.getCount();
                cursor.registerContentObserver(mObserver);
                mData = new ArrayList<>();

                if (cursor == null || !cursor.moveToNext())
                    return mData;
                cursor.moveToLast();
                do {
                    if (cursor.getLong(cursor.getColumnIndex(MediaStore.Images.ImageColumns.SIZE)) > 1024
                            * 10) {
                        PhotoModel photoModel = new PhotoModel();
                        photoModel.setOriginalPath(
                                cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA)));
                        mData.add(photoModel);
                    }
                } while (cursor.moveToPrevious());
            } catch (RuntimeException ex) {
                cursor.close();
                throw ex;
            }
        }
        return mData;
    } finally {
        synchronized (this) {
            mCancellationSignal = null;
        }
    }
}

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