Android --- Tween动画示例(XML定义的动画)

1、在res/anim目录下新建XML文件:tween_anim.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<alpha
		android:fromAlpha="0.2"
		android:toAlpha="1.0"
		android:duration="3000"
		android:repeatMode="reverse"
		android:repeatCount="10" />
	<scale
		android:fromXScale="0.2"
		android:toXScale="1.0"
		android:fromYScale="0.2"
		android:toYScale="1.0"
		android:pivotX="50%"
		android:pivotY="50%"
		android:duration="3000"
		android:repeatMode="reverse"
		android:repeatCount="10" />
	<translate
		android:fromXDelta="50"
		android:toXDelta="100"
		android:fromYDelta="50"
		android:toYDelta="100"
		android:duration="3000"
		android:repeatMode="restart"
		android:repeatCount="10" />
	<rotate
		android:fromDegrees="0"
		android:toDegrees="360"
		android:duration="3000"
		android:repeatMode="restart"
		android:repeatCount="10" />
</set>
2、在res/layout目录下新建XML文件:tween_anim_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="match_parent"
	android:layout_height="match_parent">
	<ImageView
		android:id="@+id/imgTween"
		android:src="@drawable/c01"
		android:layout_height="wrap_content"
		android:layout_width="wrap_content"
		android:layout_weight="1.0" />
	<Button
		android:id="@+id/btnControl"
		android:text="开始"
		android:layout_width="match_parent"
		android:layout_height="wrap_content" />

</LinearLayout>
3、Activity里面添加代码:

package com.bison;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class TweenAnimationDemo extends Activity {
	// 声明一个开始停止的标识符
	private boolean flags = true;
	private ImageView imgTween;
	private Button btnCtrl;

	/** 初始化 */
	public void init() {
		imgTween = (ImageView) findViewById(R.id.imgTween);
		// 声明Tween动画
		final Animation anim = AnimationUtils.loadAnimation(this,
				R.anim.tween_anim);

		btnCtrl = (Button) findViewById(R.id.btnControl);
		btnCtrl.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				if (flags) {
					btnCtrl.setText("停止");
					imgTween.startAnimation(anim);
					flags = false;
				} else {
					btnCtrl.setText("开始");
					imgTween.clearAnimation();
					flags = true;
				}

			}
		});

	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tween_anim_layout);
		init();
	}
}

PS:Tween动画有alpha(透明)、scale(缩放)、translate(移动)、rotate(旋转),每个有不同的定义,仔细研究。


原文链接: http://blog.csdn.net/bys0201/article/details/7343440

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