package com.android.launcher3.graphics; import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR; import android.content.ContentProvider; import android.content.ContentValues; import android.content.res.XmlResourceParser; import android.database.Cursor; import android.database.MatrixCursor; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.os.ParcelFileDescriptor; import android.os.ParcelFileDescriptor.AutoCloseOutputStream; import android.text.TextUtils; import android.util.Log; import android.util.Xml; import com.android.launcher3.InvariantDeviceProfile; import com.android.launcher3.InvariantDeviceProfile.GridOption; import com.android.launcher3.R; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.concurrent.Future; /** * Exposes various launcher grid options and allows the caller to change them. * APIs: * /list_options: List the various available grip options, has following columns * name: name of the grid * rows: number of rows in the grid * cols: number of columns in the grid * preview_count: number of previews available for this grid option. The preview uri * looks like /preview// * is_default: true if this grid is currently active * * /preview: Opens a file stream for the grid preview * * /default_grid: Call update to set the current grid, with values * name: name of the grid to apply */ public class GridOptionsProvider extends ContentProvider { private static final String TAG = "GridOptionsProvider"; private static final String KEY_NAME = "name"; private static final String KEY_ROWS = "rows"; private static final String KEY_COLS = "cols"; private static final String KEY_PREVIEW_COUNT = "preview_count"; private static final String KEY_IS_DEFAULT = "is_default"; private static final String KEY_LIST_OPTIONS = "/list_options"; private static final String KEY_DEFAULT_GRID = "/default_grid"; private static final String KEY_PREVIEW = "preview"; private static final String MIME_TYPE_PNG = "image/png"; public static final PipeDataWriter> BITMAP_WRITER = new PipeDataWriter>() { @Override public void writeDataToPipe(ParcelFileDescriptor output, Uri uri, String s, Bundle bundle, Future bitmap) { try (AutoCloseOutputStream os = new AutoCloseOutputStream(output)) { bitmap.get().compress(Bitmap.CompressFormat.PNG, 100, os); } catch (Exception e) { Log.w(TAG, "fail to write to pipe", e); } } }; @Override public boolean onCreate() { return true; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { if (!KEY_LIST_OPTIONS.equals(uri.getPath())) { return null; } MatrixCursor cursor = new MatrixCursor(new String[] { KEY_NAME, KEY_ROWS, KEY_COLS, KEY_PREVIEW_COUNT, KEY_IS_DEFAULT}); InvariantDeviceProfile idp = InvariantDeviceProfile.INSTANCE.get(getContext()); for (GridOption gridOption : parseAllGridOptions()) { cursor.newRow() .add(KEY_NAME, gridOption.name) .add(KEY_ROWS, gridOption.numRows) .add(KEY_COLS, gridOption.numColumns) .add(KEY_PREVIEW_COUNT, 1) .add(KEY_IS_DEFAULT, idp.numColumns == gridOption.numColumns && idp.numRows == gridOption.numRows); } return cursor; } private List parseAllGridOptions() { List result = new ArrayList<>(); try (XmlResourceParser parser = getContext().getResources().getXml(R.xml.device_profiles)) { final int depth = parser.getDepth(); int type; while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if ((type == XmlPullParser.START_TAG) && GridOption.TAG_NAME.equals(parser.getName())) { result.add(new GridOption(getContext(), Xml.asAttributeSet(parser))); } } } catch (IOException | XmlPullParserException e) { Log.e(TAG, "Error parsing device profile", e); return Collections.emptyList(); } return result; } @Override public String getType(Uri uri) { List segments = uri.getPathSegments(); if (segments.size() > 0 && KEY_PREVIEW.equals(segments.get(0))) { return MIME_TYPE_PNG; } return "vnd.android.cursor.dir/launcher_grid"; } @Override public Uri insert(Uri uri, ContentValues initialValues) { return null; } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { return 0; } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { if (!KEY_DEFAULT_GRID.equals(uri.getPath())) { return 0; } String gridName = values.getAsString(KEY_NAME); // Verify that this is a valid grid option GridOption match = null; for (GridOption option : parseAllGridOptions()) { if (option.name.equals(gridName)) { match = option; break; } } if (match == null) { return 0; } InvariantDeviceProfile.INSTANCE.get(getContext()).setCurrentGrid(getContext(), gridName); return 1; } @Override public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException { List segments = uri.getPathSegments(); if (segments.size() < 2 || !KEY_PREVIEW.equals(segments.get(0))) { throw new FileNotFoundException("Invalid preview url"); } String profileName = segments.get(1); if (TextUtils.isEmpty(profileName)) { throw new FileNotFoundException("Invalid preview url"); } InvariantDeviceProfile idp; try { idp = new InvariantDeviceProfile(getContext(), profileName); } catch (Exception e) { throw new FileNotFoundException(e.getMessage()); } try { return openPipeHelper(uri, MIME_TYPE_PNG, null, UI_HELPER_EXECUTOR.submit(new LauncherPreviewRenderer(getContext(), idp)), BITMAP_WRITER); } catch (Exception e) { throw new FileNotFoundException(e.getMessage()); } } }