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am a094ce56: am d6ffb0ae: am 544a42f0: Example activity for RecyclerView

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* commit 'a094ce56778af581c3b518ce92eb87e36952462f':
  Example activity for RecyclerView
This commit is contained in:
Adam Powell
2014-01-09 21:36:56 +00:00
committed by Android Git Automerger
parent d4856d426d a094ce5677
commit a5c39b2bea
4 changed files with 311 additions and 1 deletions
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3
samples/Support7Demos/Android.mk
View File

@@ -26,7 +26,8 @@ LOCAL_STATIC_JAVA_LIBRARIES := \
android-support-v4 \
android-support-v7-appcompat \
android-support-v7-gridlayout \
android-support-v7-mediarouter
android-support-v7-mediarouter \
android-support-v7-recyclerview
LOCAL_RESOURCE_DIR = \
$(LOCAL_PATH)/res \
frameworks/support/v7/appcompat/res \

10
samples/Support7Demos/AndroidManifest.xml
View File

@@ -172,5 +172,15 @@
</intent-filter>
</activity>
<!-- RecyclerView samples -->
<activity android:name=".widget.RecyclerViewActivity"
android:label="@string/recycler_view"
android:theme="@style/Theme.AppCompat">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="com.example.android.supportv7.SAMPLE_CODE" />
</intent-filter>
</activity>
</application>
</manifest>

1
samples/Support7Demos/res/values/strings.xml
View File

@@ -95,4 +95,5 @@
<string name="sample_media_route_activity_local">Local Playback</string>
<string name="sample_media_route_activity_presentation">Local Playback on Presentation Display</string>
<string name="recycler_view">RecyclerView</string>
</resources>

298
samples/Support7Demos/src/com/example/android/supportv7/widget/RecyclerViewActivity.java Normal file
View File

@@ -0,0 +1,298 @@
/*
* Copyright (C) 2013 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.supportv7.widget;
import android.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.MeasureSpec;
import android.widget.TextView;
public class RecyclerViewActivity extends Activity {
private RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final RecyclerView rv = new RecyclerView(this);
rv.setLayoutManager(new MyLayoutManager(this));
rv.setHasFixedSize(true);
rv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
rv.setAdapter(new MyAdapter());
setContentView(rv);
mRecyclerView = rv;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuItemCompat.setShowAsAction(menu.add("Layout"), MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
mRecyclerView.requestLayout();
return super.onOptionsItemSelected(item);
}
private static final int SCROLL_DISTANCE = 80; // dp
/**
* A basic ListView-style LayoutManager.
*/
class MyLayoutManager extends RecyclerView.LayoutManager {
private static final String TAG = "MyLayoutManager";
private int mFirstPosition;
private final int mScrollDistance;
public MyLayoutManager(Context c) {
final DisplayMetrics dm = c.getResources().getDisplayMetrics();
mScrollDistance = (int) (SCROLL_DISTANCE * dm.density + 0.5f);
}
@Override
public void layoutChildren(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler) {
final RecyclerView parent = getRecyclerView();
final int parentBottom = parent.getHeight() - parent.getPaddingBottom();
recycler.scrapAllViewsAttached();
int top = parent.getPaddingTop();
int bottom;
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int count = adapter.getItemCount();
for (int i = 0; mFirstPosition + i < count && top < parentBottom; i++, top = bottom) {
View v = recycler.getViewForPosition(mFirstPosition + i);
addView(v, i);
v.measure(MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
bottom = top + v.getMeasuredHeight();
v.layout(left, top, right, bottom);
}
recycler.detachDirtyScrapViews();
}
@Override
public RecyclerView.LayoutParams generateDefaultLayoutParams() {
return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
@Override
public boolean canScrollVertically() {
return true;
}
@Override
public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler) {
final RecyclerView parent = getRecyclerView();
if (parent.getChildCount() == 0) {
return 0;
}
int scrolled = 0;
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
if (dy < 0) {
while (scrolled > dy) {
final View topView = parent.getChildAt(0);
final int hangingTop = Math.max(-topView.getTop(), 0);
final int scrollBy = Math.min(scrolled - dy, hangingTop);
scrolled -= scrollBy;
parent.offsetChildrenVertical(scrollBy);
if (mFirstPosition > 0 && scrolled > dy) {
mFirstPosition--;
View v = recycler.getViewForPosition(mFirstPosition);
addView(v, 0);
v.measure(MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
final int bottom = topView.getTop(); // TODO decorated top?
final int top = bottom - v.getMeasuredHeight();
v.layout(left, top, right, bottom);
} else {
break;
}
}
} else if (dy > 0) {
final int parentHeight = parent.getHeight();
while (scrolled < dy) {
final View bottomView = parent.getChildAt(parent.getChildCount() - 1);
final int hangingBottom = Math.max(bottomView.getBottom() - parentHeight, 0);
final int scrollBy = -Math.min(dy - scrolled, hangingBottom);
scrolled -= scrollBy;
parent.offsetChildrenVertical(scrollBy);
if (scrolled < dy &&
parent.getAdapter().getItemCount() > mFirstPosition + parent.getChildCount()) {
View v = recycler.getViewForPosition(
mFirstPosition + parent.getChildCount());
final int top = parent.getChildAt(parent.getChildCount() - 1).getBottom();
addView(v);
v.measure(MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
final int bottom = top + v.getMeasuredHeight();
v.layout(left, top, right, bottom);
} else {
break;
}
}
}
detachAndScrapViewsOutOfBounds(recycler);
return scrolled;
}
@Override
public View onFocusSearchFailed(View focused, int direction,
RecyclerView.Recycler recycler) {
final RecyclerView rv = getRecyclerView();
final int oldFirstPosition = mFirstPosition;
final int oldCount = rv.getChildCount();
if (oldCount == 0) {
return null;
}
final int left = rv.getPaddingLeft();
final int right = rv.getWidth() - rv.getPaddingRight();
View toFocus = null;
int newViewsHeight = 0;
if (direction == View.FOCUS_UP || direction == View.FOCUS_BACKWARD) {
while (mFirstPosition > 0 && newViewsHeight < mScrollDistance) {
mFirstPosition--;
View v = recycler.getViewForPosition(mFirstPosition);
final int bottom = rv.getChildAt(0).getTop(); // TODO decorated top?
addView(v, 0);
v.measure(MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
final int top = bottom - v.getMeasuredHeight();
v.layout(left, top, right, bottom);
if (v.isFocusable()) {
toFocus = v;
break;
}
}
}
if (direction == View.FOCUS_DOWN || direction == View.FOCUS_FORWARD) {
while (mFirstPosition + rv.getChildCount() < rv.getAdapter().getItemCount() &&
newViewsHeight < mScrollDistance) {
View v = recycler.getViewForPosition(mFirstPosition + rv.getChildCount());
final int top = rv.getChildAt(rv.getChildCount() - 1).getBottom();
addView(v);
v.measure(MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
final int bottom = top + v.getMeasuredHeight();
v.layout(left, top, right, bottom);
if (v.isFocusable()) {
toFocus = v;
break;
}
}
}
return toFocus;
}
public void detachAndScrapViewsOutOfBounds(RecyclerView.Recycler recycler) {
final RecyclerView parent = getRecyclerView();
final int childCount = parent.getChildCount();
final int parentWidth = parent.getWidth();
final int parentHeight = parent.getHeight();
boolean foundFirst = false;
int first = 0;
int last = 0;
for (int i = 0; i < childCount; i++) {
final View v = parent.getChildAt(i);
if (v.hasFocus() || (v.getRight() >= 0 && v.getLeft() <= parentWidth &&
v.getBottom() >= 0 && v.getTop() <= parentHeight)) {
if (!foundFirst) {
first = i;
foundFirst = true;
}
last = i;
}
}
for (int i = childCount - 1; i > last; i--) {
recycler.detachAndScrapView(parent.getChildAt(i));
}
for (int i = 0; i < first; i++) {
recycler.detachAndScrapView(parent.getChildAt(i));
}
if (parent.getChildCount() == 0) {
mFirstPosition = 0;
} else {
mFirstPosition += first;
}
}
}
class MyAdapter extends RecyclerView.Adapter {
private int mBackground;
public MyAdapter() {
TypedValue val = new TypedValue();
RecyclerViewActivity.this.getTheme().resolveAttribute(
R.attr.selectableItemBackground, val, true);
mBackground = val.resourceId;
}
@Override
public RecyclerView.ViewHolder createViewHolder(ViewGroup parent, int viewType) {
ViewHolder h = new ViewHolder(new TextView(RecyclerViewActivity.this));
h.textView.setMinimumHeight(128);
h.textView.setFocusable(true);
h.textView.setBackgroundResource(mBackground);
return h;
}
@Override
public void bindViewHolder(RecyclerView.ViewHolder holder, int position) {
((ViewHolder) holder).textView.setText("Item " + position);
}
@Override
public int getItemCount() {
return 100;
}
}
static class ViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public ViewHolder(TextView v) {
super(v);
textView = v;
}
}
}