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A quick sample of the new physics-based animation library added in Support Library 25.3.0 docs: https://developer.android.com/reference/android/support/animation/package-summary.html output: https://twitter.com/crafty/status/842055117323026432
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/* | |
* Copyright 2017 Google Inc. | |
* | |
* 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. | |
*/ | |
apply plugin: 'com.android.application' | |
android { | |
compileSdkVersion 25 | |
buildToolsVersion "25.0.2" | |
defaultConfig { | |
applicationId "com.example.boing" | |
minSdkVersion 25 | |
targetSdkVersion 25 | |
versionCode 1 | |
versionName "1.0" | |
} | |
buildTypes { | |
release { | |
minifyEnabled false | |
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' | |
} | |
} | |
} | |
dependencies { | |
compile fileTree(dir: 'libs', include: ['*.jar']) | |
compile 'com.android.support:support-dynamic-animation:25.3.0' | |
compile 'com.android.support:design:25.3.0' | |
} |
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/* | |
* Copyright 2017 Google Inc. | |
* | |
* 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.boing; | |
import android.app.Activity; | |
import android.os.Bundle; | |
import android.support.animation.SpringAnimation; | |
import android.view.MotionEvent; | |
import android.view.VelocityTracker; | |
import android.view.View; | |
import android.widget.SeekBar; | |
public class MainActivity extends Activity { | |
private float downX, downY; | |
private SeekBar damping, stiffness; | |
private VelocityTracker velocityTracker; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
findViewById(android.R.id.content).setSystemUiVisibility( | |
View.SYSTEM_UI_FLAG_LAYOUT_STABLE | |
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | |
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION); | |
stiffness = (SeekBar) findViewById(R.id.stiffness); | |
damping = (SeekBar) findViewById(R.id.damping); | |
velocityTracker = VelocityTracker.obtain(); | |
final View box = findViewById(R.id.box); | |
findViewById(R.id.root).setOnTouchListener(new View.OnTouchListener() { | |
@Override public boolean onTouch(View v, MotionEvent event) { | |
switch (event.getAction()) { | |
case MotionEvent.ACTION_DOWN: | |
downX = event.getX(); | |
downY = event.getY(); | |
velocityTracker.addMovement(event); | |
return true; | |
case MotionEvent.ACTION_MOVE: | |
box.setTranslationX(event.getX() - downX); | |
box.setTranslationY(event.getY() - downY); | |
velocityTracker.addMovement(event); | |
return true; | |
case MotionEvent.ACTION_UP: | |
case MotionEvent.ACTION_CANCEL: | |
velocityTracker.computeCurrentVelocity(1000); | |
if (box.getTranslationX() != 0) { | |
SpringAnimation animX = new SpringAnimation(box, SpringAnimation.TRANSLATION_X, 0); | |
animX.getSpring().setStiffness(getStiffness()); | |
animX.getSpring().setDampingRatio(getDamping()); | |
animX.setStartVelocity(velocityTracker.getXVelocity()); | |
animX.start(); | |
} | |
if (box.getTranslationY() != 0) { | |
SpringAnimation animY = new SpringAnimation(box, SpringAnimation.TRANSLATION_Y, 0); | |
animY.getSpring().setStiffness(getStiffness()); | |
animY.getSpring().setDampingRatio(getDamping()); | |
animY.setStartVelocity(velocityTracker.getYVelocity()); | |
animY.start(); | |
} | |
velocityTracker.clear(); | |
return true; | |
} | |
return false; | |
} | |
}); | |
} | |
private float getStiffness() { | |
return Math.max(stiffness.getProgress(), 1f); | |
} | |
private float getDamping() { | |
return damping.getProgress() / 100f; | |
} | |
} |
Can you show how to implement this example Figure 2: Animation built by using physics-based APIs fromhttps://developer.android.com/guide/topics/graphics/physics-based-animation.html
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activity_main.xml
is like this: