android笔记——点击按钮放大

package com.example.button;

import android.os.Bundle;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

private Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
button.setOnTouchListener(new Button.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
//点击按钮未松开时按钮放大
blow_up(button);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
//点击按钮松开后按钮缩小
narrow(button);
}
return false;
}
});

}
//放大按钮动画
private void blow_up(View v) {
float[] vaules = new float[] { 1.0f, 1.1f, 1.2f, 1.3f, 1.4f, 1.5f};
AnimatorSet set = new AnimatorSet();
set.playTogether(ObjectAnimator.ofFloat(v, "scaleX", vaules),
ObjectAnimator.ofFloat(v, "scaleY", vaules));
set.setDuration(150);
set.start();
}
//缩小按钮动画
private void narrow(View v) {
float[] vaules = new float[] { 1.5f, 1.4f, 1.3f, 1.2f, 1.1f, 1.0f};
AnimatorSet set = new AnimatorSet();
set.playTogether(ObjectAnimator.ofFloat(v, "scaleX", vaules),
ObjectAnimator.ofFloat(v, "scaleY", vaules));
set.setDuration(150);
set.start();
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".MainActivity" >

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点我放大" />

</RelativeLayout>