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am 2d719d6c: AnimatedRecyclerActivity demo supports simpler RV item animations

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* commit '2d719d6c716e4b800c9b9bcd31fe36fdddb8adfd':
  AnimatedRecyclerActivity demo supports simpler RV item animations
This commit is contained in:
Chet Haase
2014-06-11 12:41:38 +00:00
committed by Android Git Automerger
parent 6618e52d97 2d719d6c71
commit 5dc15512b8
3 changed files with 63 additions and 38 deletions
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26
samples/Support7Demos/res/layout/animated_recycler_view.xml
View File

@@ -6,12 +6,26 @@
android:layout_width="match_parent"
android:layout_height="match_parent">
<CheckBox
android:id="@+id/enableAnimations"
android:checked="true"
android:text="@string/enableAnimations"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<CheckBox
android:id="@+id/enableAnimations"
android:checked="true"
android:text="@string/enableAnimations"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<CheckBox
android:id="@+id/enablePredictiveAnimations"
android:checked="true"
android:text="@string/enablePredictiveAnimations"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"

3
samples/Support7Demos/res/values/strings.xml
View File

@@ -103,8 +103,9 @@
<string name="checkbox_layout_dir">Layout Dir</string>
<string name="checkbox_stack_from_end">Stack From End</string>
<string name="enableAnimations">Animate Changes</string>
<string name="enablePredictiveAnimations">Predictive Animations</string>
<string name="add_item">Add</string>
<string name="delete_item">Delete</string>
<string name="delete_item">Del</string>
<string name="add_delete_item">A+D</string>
<string name="delete_add_item">D+A</string>
<string name="d1a2d3">d1a2d3</string>

72
samples/Support7Demos/src/com/example/android/supportv7/widget/AnimatedRecyclerView.java
View File

@@ -45,9 +45,8 @@ public class AnimatedRecyclerView extends Activity {
ArrayList<String> mItems = new ArrayList<String>();
MyAdapter mAdapter;
static final boolean USE_CUSTOM_ANIMATIONS = false;
boolean mAnimationsEnabled = true;
boolean mPredictiveAnimationsEnabled = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
@@ -74,6 +73,15 @@ public class AnimatedRecyclerView extends Activity {
mAnimationsEnabled = isChecked;
}
});
CheckBox enablePredictiveAnimations =
(CheckBox) findViewById(R.id.enablePredictiveAnimations);
enablePredictiveAnimations.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mPredictiveAnimationsEnabled = isChecked;
}
});
}
@Override
@@ -158,8 +166,8 @@ public class AnimatedRecyclerView extends Activity {
}
@Override
public boolean supportsItemAnimations() {
return mAnimationsEnabled;
public boolean supportsPredictiveItemAnimations() {
return mPredictiveAnimationsEnabled;
}
@Override
@@ -186,44 +194,46 @@ public class AnimatedRecyclerView extends Activity {
View v = recycler.getViewForPosition(mFirstPosition + i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
if (!params.isItemRemoved()) {
if (!mPredictiveAnimationsEnabled || !params.isItemRemoved()) {
addView(v);
}
measureChild(v, 0, 0);
bottom = top + v.getMeasuredHeight();
v.layout(left, top, right, bottom);
if (params.isItemRemoved()) {
if (mPredictiveAnimationsEnabled && params.isItemRemoved()) {
parentBottom += v.getHeight();
}
}
// Now that we've run a full layout, figure out which views were not used
// (cached in previousViews). For each of these views, position it where
// it would go, according to its position relative to the visible
// positions in the list. This information will be used by RecyclerView to
// record post-layout positions of these items for the purposes of animating them
// out of view
if (mAnimationsEnabled && mPredictiveAnimationsEnabled) {
// Now that we've run a full layout, figure out which views were not used
// (cached in previousViews). For each of these views, position it where
// it would go, according to its position relative to the visible
// positions in the list. This information will be used by RecyclerView to
// record post-layout positions of these items for the purposes of animating them
// out of view
View lastVisibleView = getChildAt(getChildCount() - 1);
if (lastVisibleView != null) {
RecyclerView.LayoutParams lastParams =
(RecyclerView.LayoutParams) lastVisibleView.getLayoutParams();
int lastPosition = lastParams.getViewPosition();
final List<RecyclerView.ViewHolder> previousViews = recycler.getScrapList();
count = previousViews.size();
for (int i = 0; i < count; ++i) {
View view = previousViews.get(i).itemView;
RecyclerView.LayoutParams params =
(RecyclerView.LayoutParams) view.getLayoutParams();
int position = params.getViewPosition();
int newTop;
if (position < mFirstPosition) {
newTop = view.getHeight() * (position - mFirstPosition);
} else {
newTop = lastVisibleView.getTop() + view.getHeight() *
(position - lastPosition);
View lastVisibleView = getChildAt(getChildCount() - 1);
if (lastVisibleView != null) {
RecyclerView.LayoutParams lastParams =
(RecyclerView.LayoutParams) lastVisibleView.getLayoutParams();
int lastPosition = lastParams.getViewPosition();
final List<RecyclerView.ViewHolder> previousViews = recycler.getScrapList();
count = previousViews.size();
for (int i = 0; i < count; ++i) {
View view = previousViews.get(i).itemView;
RecyclerView.LayoutParams params =
(RecyclerView.LayoutParams) view.getLayoutParams();
int position = params.getViewPosition();
int newTop;
if (position < mFirstPosition) {
newTop = view.getHeight() * (position - mFirstPosition);
} else {
newTop = lastVisibleView.getTop() + view.getHeight() *
(position - lastPosition);
}
view.offsetTopAndBottom(newTop - view.getTop());
}
view.offsetTopAndBottom(newTop - view.getTop());
}
}
}