/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.wearable.gridviewpager;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.AsyncTask;
import android.support.v4.util.LruCache;
import android.support.wearable.view.CardFragment;
import android.support.wearable.view.FragmentGridPagerAdapter;
import android.support.wearable.view.GridPagerAdapter;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
/**
* Constructs fragments as requested by the GridViewPager. For each row a different background is
* provided.
* <p>
* Always avoid loading resources from the main thread. In this sample, the background images are
* loaded from an background task and then updated using {@link #notifyRowBackgroundChanged(int)}
* and {@link #notifyPageBackgroundChanged(int, int)}.
*/
public class SampleGridPagerAdapter extends FragmentGridPagerAdapter {
private static final int TRANSITION_DURATION_MILLIS = 100;
private final Context mContext;
private List<Row> mRows;
private ColorDrawable mDefaultBg;
private ColorDrawable mClearBg;
public SampleGridPagerAdapter(Context ctx, FragmentManager fm) {
super(fm);
mContext = ctx;
mRows = new ArrayList<SampleGridPagerAdapter.Row>();
mRows.add(new Row(cardFragment(R.string.welcome_title, R.string.welcome_text)));
mRows.add(new Row(cardFragment(R.string.about_title, R.string.about_text)));
mRows.add(new Row(
cardFragment(R.string.cards_title, R.string.cards_text),
cardFragment(R.string.expansion_title, R.string.expansion_text)));
mRows.add(new Row(
cardFragment(R.string.backgrounds_title, R.string.backgrounds_text),
cardFragment(R.string.columns_title, R.string.columns_text)));
mRows.add(new Row(new CustomFragment()));
mRows.add(new Row(cardFragment(R.string.dismiss_title, R.string.dismiss_text)));
mDefaultBg = new ColorDrawable(R.color.dark_grey);
mClearBg = new ColorDrawable(android.R.color.transparent);
}
LruCache<Integer, Drawable> mRowBackgrounds = new LruCache<Integer, Drawable>(3) {
@Override
protected Drawable create(final Integer row) {
int resid = BG_IMAGES[row % BG_IMAGES.length];
new DrawableLoadingTask(mContext) {
@Override
protected void onPostExecute(Drawable result) {
TransitionDrawable background = new TransitionDrawable(new Drawable[] {
mDefaultBg,
result
});
mRowBackgrounds.put(row, background);
notifyRowBackgroundChanged(row);
background.startTransition(TRANSITION_DURATION_MILLIS);
}
}.execute(resid);
return mDefaultBg;
}
};
LruCache<Point, Drawable> mPageBackgrounds = new LruCache<Point, Drawable>(3) {
@Override
protected Drawable create(final Point page) {
// place bugdroid as the background at row 2, column 1
if (page.y == 2 && page.x == 1) {
int resid = R.drawable.bugdroid_large;
new DrawableLoadingTask(mContext) {
@Override
protected void onPostExecute(Drawable result) {
TransitionDrawable background = new TransitionDrawable(new Drawable[] {
mClearBg,
result
});
mPageBackgrounds.put(page, background);
notifyPageBackgroundChanged(page.y, page.x);
background.startTransition(TRANSITION_DURATION_MILLIS);
}
}.execute(resid);
}
return GridPagerAdapter.BACKGROUND_NONE;
}
};
private Fragment cardFragment(int titleRes, int textRes) {
Resources res = mContext.getResources();
CardFragment fragment =
CardFragment.create(res.getText(titleRes), res.getText(textRes));
// Add some extra bottom margin to leave room for the page indicator
fragment.setCardMarginBottom(
res.getDimensionPixelSize(R.dimen.card_margin_bottom));
return fragment;
}
static final int[] BG_IMAGES = new int[] {
R.drawable.debug_background_1,
R.drawable.debug_background_2,
R.drawable.debug_background_3,
R.drawable.debug_background_4,
R.drawable.debug_background_5
};
/** A convenient container for a row of fragments. */
private class Row {
final List<Fragment> columns = new ArrayList<Fragment>();
public Row(Fragment... fragments) {
for (Fragment f : fragments) {
add(f);
}
}
public void add(Fragment f) {
columns.add(f);
}
Fragment getColumn(int i) {
return columns.get(i);
}
public int getColumnCount() {
return columns.size();
}
}
@Override
public Fragment getFragment(int row, int col) {
Row adapterRow = mRows.get(row);
return adapterRow.getColumn(col);
}
@Override
public Drawable getBackgroundForRow(final int row) {
return mRowBackgrounds.get(row);
}
@Override
public Drawable getBackgroundForPage(final int row, final int column) {
return mPageBackgrounds.get(new Point(column, row));
}
@Override
public int getRowCount() {
return mRows.size();
}
@Override
public int getColumnCount(int rowNum) {
return mRows.get(rowNum).getColumnCount();
}
class DrawableLoadingTask extends AsyncTask<Integer, Void, Drawable> {
private static final String TAG = "Loader";
private Context context;
DrawableLoadingTask(Context context) {
this.context = context;
}
@Override
protected Drawable doInBackground(Integer... params) {
Log.d(TAG, "Loading asset 0x" + Integer.toHexString(params[0]));
return context.getResources().getDrawable(params[0]);
}
}
}
