最近项目要使用到点击一个按钮弹出多个按钮的效果,在试了几个类库后感觉不是很理想,所以自己代码实现了一个,下图所示:
实现原理很简单,就是利用android原声动画效果,当点击中心按钮时弹出其余按钮。闲话少叙,代码如下。
第一步:activity_main.xml 很简单,也就是五个相同位置的按钮
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<? xml version = "1.0" encoding = "utf-8" ?>
< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "match_parent"
android:layout_height = "match_parent" >
< ImageButton
android:id = "@+id/button"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "10dp"
android:src = "@drawable/im"
android:background = "@android:color/transparent" />
< ImageButton
android:id = "@+id/button1"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "10dp"
android:visibility = "invisible"
android:src = "@drawable/i"
android:background = "@android:color/transparent" />
< ImageButton
android:id = "@+id/button2"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "10dp"
android:src = "@drawable/ii"
android:visibility = "invisible"
android:background = "@android:color/transparent" />
< ImageButton
android:id = "@+id/button3"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "10dp"
android:src = "@drawable/iii"
android:visibility = "invisible"
android:background = "@android:color/transparent" />
< ImageButton
android:id = "@+id/button4"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "10dp"
android:src = "@drawable/iiii"
android:visibility = "invisible"
android:background = "@android:color/transparent" />
</ RelativeLayout >
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第二步:MainActivity
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package com.example.boombuttons;
import java.util.ArrayList;
public class MainActivity extends Activity implements OnClickListener{
// 中心按钮
private ImageButton button;
// 四个子按钮
private ImageButton button1;
private ImageButton button2;
private ImageButton button3;
private ImageButton button4;
// 子按钮列表
private List<ImageButton> buttonItems = new ArrayList<ImageButton>( 3 );
// 标识当前按钮弹出与否,1代表已经未弹出,-1代表已弹出
private int flag = 1 ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 实例化按钮并设立监听
button = (ImageButton)findViewById(R.id.button);
button.setOnClickListener( this );
button1 = (ImageButton)findViewById(R.id.button1);
button2 = (ImageButton)findViewById(R.id.button2);
button3 = (ImageButton)findViewById(R.id.button3);
button4 = (ImageButton)findViewById(R.id.button4);
// 将子按钮们加入列表中
buttonItems.add(button1);
buttonItems.add(button2);
buttonItems.add(button3);
buttonItems.add(button4);
}
/**
* 按钮移动动画
* @params 子按钮列表
* @params 弹出时圆形半径radius
*/
public void buttonAnimation(List<ImageButton> buttonList, int radius){
for ( int i= 0 ;i<buttonList.size();i++){
ObjectAnimator objAnimatorX;
ObjectAnimator objAnimatorY;
ObjectAnimator objAnimatorRotate;
// 将按钮设为可见
buttonList.get(i).setVisibility(View.VISIBLE);
// 按钮在X、Y方向的移动距离
float distanceX = ( float ) (flag*radius*(Math.cos(Util.getAngle(buttonList.size(),i))));
float distanceY = -( float ) (flag*radius*(Math.sin(Util.getAngle(buttonList.size(),i))));
// X方向移动
objAnimatorX = ObjectAnimator.ofFloat(buttonList.get(i), "x" , buttonList.get(i).getX(),buttonList.get(i).getX()+distanceX);
objAnimatorX.setDuration( 200 );
objAnimatorX.setStartDelay( 100 );
objAnimatorX.start();
// Y方向移动
objAnimatorY = ObjectAnimator.ofFloat(buttonList.get(i), "y" , buttonList.get(i).getY(),buttonList.get(i).getY()+distanceY);
objAnimatorY.setDuration( 200 );
objAnimatorY.setStartDelay( 100 );
objAnimatorY.start();
// 按钮旋转
objAnimatorRotate = ObjectAnimator.ofFloat(buttonList.get(i), "rotation" , 0 , 360 );
objAnimatorRotate.setDuration( 200 );
objAnimatorY.setStartDelay( 100 );
objAnimatorRotate.start();
if (flag==- 1 ){
objAnimatorX.addListener( new AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationRepeat(Animator animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animator animation) {
// TODO Auto-generated method stub
// 将按钮设为可见
for ( int i = 0 ; i < buttonItems.size(); i++) {
buttonItems.get(i).setVisibility(View.INVISIBLE);
}
}
@Override
public void onAnimationCancel(Animator animation) {
// TODO Auto-generated method stub
}
});
}
}
}
}
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第三步:Util.java 工具类,写了一个静态方法,用于通过按钮个数和按钮在列表中的索引计算其弹出角度。
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public class Util {
/**
* 返回每个按钮应该出现的角度(弧度单位)
* @param index
* @return double 角度(弧度单位)
*/
public static double getAngle( int total, int index){
return Math.toRadians( 90 /(total- 1 )*index+ 90 );
}
}
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/wangtaocsdn/article/details/54345715