The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2010 The Android开源工程
*
* 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.apis.animation;
// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import android.animation.Animator;
import android.animation.ObjectAnimator;
import com.example.android.apis.R;
import android.animation.AnimatorListenerAdapter;
import android.animation.Keyframe;
import android.animation.LayoutTransition;
import android.animation.PropertyValuesHolder;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
/**
* This application demonstrates how to use LayoutTransition to automate transition animations
* as items are removed from or added to a container.
*/
public class LayoutAnimations extends Activity {
private int numButtons = 1;
ViewGroup container = null;
Animator defaultAppearingAnim, defaultDisappearingAnim;
Animator defaultChangingAppearingAnim, defaultChangingDisappearingAnim;
Animator customAppearingAnim, customDisappearingAnim;
Animator customChangingAppearingAnim, customChangingDisappearingAnim;
Animator currentAppearingAnim, currentDisappearingAnim;
Animator currentChangingAppearingAnim, currentChangingDisappearingAnim;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_animations);
container = new FixedGridLayout(this);
container.setClipChildren(false);
((FixedGridLayout)container).setCellHeight(90);
((FixedGridLayout)container).setCellWidth(100);
final LayoutTransition transitioner = new LayoutTransition();
container.setLayoutTransition(transitioner);
defaultAppearingAnim = transitioner.getAnimator(LayoutTransition.APPEARING);
defaultDisappearingAnim =
transitioner.getAnimator(LayoutTransition.DISAPPEARING);
defaultChangingAppearingAnim =
transitioner.getAnimator(LayoutTransition.CHANGE_APPEARING);
defaultChangingDisappearingAnim =
transitioner.getAnimator(LayoutTransition.CHANGE_DISAPPEARING);
createCustomAnimations(transitioner);
currentAppearingAnim = defaultAppearingAnim;
currentDisappearingAnim = defaultDisappearingAnim;
currentChangingAppearingAnim = defaultChangingAppearingAnim;
currentChangingDisappearingAnim = defaultChangingDisappearingAnim;
ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
parent.addView(container);
parent.setClipChildren(false);
Button addButton = (Button) findViewById(R.id.addNewButton);
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Button newButton = new Button(LayoutAnimations.this);
newButton.setText(String.valueOf(numButtons++));
newButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
container.removeView(v);
}
});
container.addView(newButton, Math.min(1, container.getChildCount()));
}
});
CheckBox customAnimCB = (CheckBox) findViewById(R.id.customAnimCB);
customAnimCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setupTransition(transitioner);
}
});
// Check for disabled animations
CheckBox appearingCB = (CheckBox) findViewById(R.id.appearingCB);
appearingCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setupTransition(transitioner);
}
});
CheckBox disappearingCB = (CheckBox) findViewById(R.id.disappearingCB);
disappearingCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setupTransition(transitioner);
}
});
CheckBox changingAppearingCB = (CheckBox) findViewById(R.id.changingAppearingCB);
changingAppearingCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setupTransition(transitioner);
}
});
CheckBox changingDisappearingCB = (CheckBox) findViewById(R.id.changingDisappearingCB);
changingDisappearingCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setupTransition(transitioner);
}
});
}
private void setupTransition(LayoutTransition transition) {
CheckBox customAnimCB = (CheckBox) findViewById(R.id.customAnimCB);
CheckBox appearingCB = (CheckBox) findViewById(R.id.appearingCB);
CheckBox disappearingCB = (CheckBox) findViewById(R.id.disappearingCB);
CheckBox changingAppearingCB = (CheckBox) findViewById(R.id.changingAppearingCB);
CheckBox changingDisappearingCB = (CheckBox) findViewById(R.id.changingDisappearingCB);
transition.setAnimator(LayoutTransition.APPEARING, appearingCB.isChecked() ?
(customAnimCB.isChecked() ? customAppearingAnim : defaultAppearingAnim) : null);
transition.setAnimator(LayoutTransition.DISAPPEARING, disappearingCB.isChecked() ?
(customAnimCB.isChecked() ? customDisappearingAnim : defaultDisappearingAnim) : null);
transition.setAnimator(LayoutTransition.CHANGE_APPEARING, changingAppearingCB.isChecked() ?
(customAnimCB.isChecked() ? customChangingAppearingAnim :
defaultChangingAppearingAnim) : null);
transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,
changingDisappearingCB.isChecked() ?
(customAnimCB.isChecked() ? customChangingDisappearingAnim :
defaultChangingDisappearingAnim) : null);
}
private void createCustomAnimations(LayoutTransition transition) {
// Changing while Adding
PropertyValuesHolder pvhLeft =
PropertyValuesHolder.ofInt("left", 0, 1);
PropertyValuesHolder pvhTop =
PropertyValuesHolder.ofInt("top", 0, 1);
PropertyValuesHolder pvhRight =
PropertyValuesHolder.ofInt("right", 0, 1);
PropertyValuesHolder pvhBottom =
PropertyValuesHolder.ofInt("bottom", 0, 1);
PropertyValuesHolder pvhScaleX =
PropertyValuesHolder.ofFloat("scaleX", 1f, 0f, 1f);
PropertyValuesHolder pvhScaleY =
PropertyValuesHolder.ofFloat("scaleY", 1f, 0f, 1f);
customChangingAppearingAnim = ObjectAnimator.ofPropertyValuesHolder(
this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhScaleX, pvhScaleY).
setDuration(transition.getDuration(LayoutTransition.CHANGE_APPEARING));
customChangingAppearingAnim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setScaleX(1f);
view.setScaleY(1f);
}
});
// Changing while Removing
Keyframe kf0 = Keyframe.ofFloat(0f, 0f);
Keyframe kf1 = Keyframe.ofFloat(.9999f, 360f);
Keyframe kf2 = Keyframe.ofFloat(1f, 0f);
PropertyValuesHolder pvhRotation =
PropertyValuesHolder.ofKeyframe("rotation", kf0, kf1, kf2);
customChangingDisappearingAnim = ObjectAnimator.ofPropertyValuesHolder(
this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhRotation).
setDuration(transition.getDuration(LayoutTransition.CHANGE_DISAPPEARING));
customChangingDisappearingAnim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotation(0f);
}
});
// Adding
customAppearingAnim = ObjectAnimator.ofFloat(null, "rotationY", 90f, 0f).
setDuration(transition.getDuration(LayoutTransition.APPEARING));
customAppearingAnim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationY(0f);
}
});
// Removing
customDisappearingAnim = ObjectAnimator.ofFloat(null, "rotationX", 0f, 90f).
setDuration(transition.getDuration(LayoutTransition.DISAPPEARING));
customDisappearingAnim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationX(0f);
}
});
}
}