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 android.widget.LinearLayout;
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 hidden or shown in a container.
*/
public class LayoutAnimationsHideShow extends Activity {
private int numButtons = 1;
ViewGroup container = null;
private LayoutTransition mTransitioner;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_animations_hideshow);
final CheckBox hideGoneCB = (CheckBox) findViewById(R.id.hideGoneCB);
container = new LinearLayout(this);
container.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
// Add a slew of buttons to the container. We won't add any more buttons at runtime, but
// will just show/hide the buttons we've already created
for (int i = 0; i < 4; ++i) {
Button newButton = new Button(this);
newButton.setText(String.valueOf(i));
container.addView(newButton);
newButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
v.setVisibility(hideGoneCB.isChecked() ? View.GONE : View.INVISIBLE);
}
});
}
resetTransition();
ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
parent.addView(container);
Button addButton = (Button) findViewById(R.id.addNewButton);
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
for (int i = 0; i < container.getChildCount(); ++i) {
View view = (View) container.getChildAt(i);
view.setVisibility(View.VISIBLE);
}
}
});
CheckBox customAnimCB = (CheckBox) findViewById(R.id.customAnimCB);
customAnimCB.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
long duration;
if (isChecked) {
mTransitioner.setStagger(LayoutTransition.CHANGE_APPEARING, 30);
mTransitioner.setStagger(LayoutTransition.CHANGE_DISAPPEARING, 30);
setupCustomAnimations();
duration = 500;
} else {
resetTransition();
duration = 300;
}
mTransitioner.setDuration(duration);
}
});
}
private void resetTransition() {
mTransitioner = new LayoutTransition();
container.setLayoutTransition(mTransitioner);
}
private void setupCustomAnimations() {
// 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);
final ObjectAnimator changeIn = ObjectAnimator.ofPropertyValuesHolder(
this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhScaleX, pvhScaleY).
setDuration(mTransitioner.getDuration(LayoutTransition.CHANGE_APPEARING));
mTransitioner.setAnimator(LayoutTransition.CHANGE_APPEARING, changeIn);
changeIn.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);
final ObjectAnimator changeOut = ObjectAnimator.ofPropertyValuesHolder(
this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhRotation).
setDuration(mTransitioner.getDuration(LayoutTransition.CHANGE_DISAPPEARING));
mTransitioner.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, changeOut);
changeOut.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotation(0f);
}
});
// Adding
ObjectAnimator animIn = ObjectAnimator.ofFloat(null, "rotationY", 90f, 0f).
setDuration(mTransitioner.getDuration(LayoutTransition.APPEARING));
mTransitioner.setAnimator(LayoutTransition.APPEARING, animIn);
animIn.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationY(0f);
}
});
// Removing
ObjectAnimator animOut = ObjectAnimator.ofFloat(null, "rotationX", 0f, 90f).
setDuration(mTransitioner.getDuration(LayoutTransition.DISAPPEARING));
mTransitioner.setAnimator(LayoutTransition.DISAPPEARING, animOut);
animOut.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationX(0f);
}
});
}
}