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/*
* 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.multipropertyanimations;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
/**
* This example shows various ways of animating multiple properties in parallel.
*
* Watch the associated video for this demo on the DevBytes channel of developer.android.com
* or on the DevBytes playlist in the androiddevelopers channel on YouTube at
* https://www.youtube.com/playlist?list=PLWz5rJ2EKKc_XOgcRukSoKKjewFJZrKV0.
*/
public class MultiPropertyAnimations extends Activity {
private static final float TX_START = 0;
private static final float TY_START = 0;
private static final float TX_END = 400;
private static final float TY_END = 200;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_multi_property_animations);
}
/**
* A very manual approach to animation uses a ValueAnimator to animate a fractional
* value and then turns that value into the final property values which are then set
* directly on the target object.
*/
public void runValueAnimator(final View view) {
ValueAnimator anim = ValueAnimator.ofFloat(0, 400);
anim.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
float fraction = animator.getAnimatedFraction();
view.setTranslationX(TX_START + fraction * (TX_END - TX_START));
view.setTranslationY(TY_START + fraction * (TY_END - TY_START));
}
});
anim.start();
}
/**
* ViewPropertyAnimator is the cleanest and most efficient way of animating
* View properties, even when there are multiple properties to be animated
* in parallel.
*/
public void runViewPropertyAnimator(View view) {
view.animate().translationX(TX_END).translationY(TY_END);
}
/**
* Multiple ObjectAnimator objects can be created and run in parallel.
*/
public void runObjectAnimators(View view) {
ObjectAnimator.ofFloat(view, View.TRANSLATION_X, TX_END).start();
ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, TY_END).start();
// Optional: use an AnimatorSet to run these in parallel
}
/**
* Using PropertyValuesHolder objects enables the use of a single ObjectAnimator
* per target, even when there are multiple properties being animated on that target.
*/
public void runObjectAnimator(View view) {
PropertyValuesHolder pvhTX = PropertyValuesHolder.ofFloat(View.TRANSLATION_X, TX_END);
PropertyValuesHolder pvhTY = PropertyValuesHolder.ofFloat(View.TRANSLATION_Y, TY_END);
ObjectAnimator.ofPropertyValuesHolder(view, pvhTX, pvhTY).start();
}
}
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