ScaleAnimation缩放动画Demo

本文介绍如何使用Java在Android中创建缩放动画效果。通过两种方式实现:一是直接使用Java代码设置动画参数,二是通过XML文件定义动画属性。文章详细解释了各参数的意义,如水平和垂直缩放因子、缩放中心点等。

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一、通过Java实现动画:

fromX :Horizontal scaling factor to apply at the start of the animation
toX: Horizontal scaling factor to apply at the end of the animation
fromY: Vertical scaling factor to apply at the start of the animation
toY :Vertical scaling factor to apply at the end of the animation
pivotX :The X coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the left edge. (This point remains fixed while the object changes size.)
pivotY :The Y coordinate of the point about which the object is being scaled, specified as an absolute number where 0 is the top edge. (This point remains fixed while the object changes size.)

package com.jikexueyuan.scaleanimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.ScaleAnimation;

public class MainActivity extends Activity {
	
	
	private ScaleAnimation sa;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
        sa = new ScaleAnimation(0, //<strong>fromX</strong> 
1, //<span style="font-weight: bold;">toX</span>
0, //<span style="font-weight: bold;">fromY</span>
1,//<span style="font-weight: bold;">toY</span>
100,  //<strong>pivotX</strong> 
50  //<span style="font-weight: bold;">pivotY</span>
);
        sa = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        sa.setDuration(1000);
        
        findViewById(R.id.btnScaleMe).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				arg0.startAnimation(sa);
//				arg0.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.sa));
			}
		});
    }
}


二、通过sa.xml实现动画:

package com.jikexueyuan.scaleanimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.ScaleAnimation;

public class MainActivity extends Activity {
	
	
	private ScaleAnimation sa;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
//        sa = new ScaleAnimation(0, 1, 0, 1,100,50);
//        sa = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
//        sa.setDuration(1000);
        
        findViewById(R.id.btnScaleMe).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				arg0.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.sa));
			}
		});
    }
    }
}


sa.xml:

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromXScale="0"
    android:toXScale="1"
    android:fromYScale="0"
    android:toYScale="1"
    android:duration="1000"
    android:pivotX="50%"
    android:pivotY="50%" >

</scale>


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