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package com.android.launcher3.graphics;
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 com.android.launcher3.util.LooperExecutor;
import com.android.launcher3.util.UiThreadHelper;
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/<grid-name>/<preview index starting with 0>
* 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<Future<Bitmap>> BITMAP_WRITER =
new PipeDataWriter<Future<Bitmap>>() {
@Override
public void writeDataToPipe(ParcelFileDescriptor output, Uri uri, String s,
Bundle bundle, Future<Bitmap> 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<GridOption> parseAllGridOptions() {
List<GridOption> 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<String> 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<String> 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());
}
LooperExecutor executor = new LooperExecutor(UiThreadHelper.getBackgroundLooper());
try {
return openPipeHelper(uri, MIME_TYPE_PNG, null,
executor.submit(new LauncherPreviewRenderer(getContext(), idp)), BITMAP_WRITER);
} catch (Exception e) {
throw new FileNotFoundException(e.getMessage());
}
}
}
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