如何在Android中对按钮进行翻转
这篇文章主要介绍了如何在Android中对按钮进行翻转，此处通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考价值，需要的朋友可以参考下：
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Android是什么
Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
1.按钮的基本布局如下
2.自定义控件开门三步走
构造函数，onMeasure，onLayout
package net.codepig.customviewdemo.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import net.codepig.customviewdemo.R;
public class flippedButton extends LinearLayout {
private Context mContext;
private int mWidth;//容器的宽度
private int mHeight;//容器的高度
private TextView buttonText;
private FrameLayout mButton;
public flippedButton(Context context){
super(context);
this.mContext = context;
init(context);
}
public flippedButton(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
init(context);
}
public flippedButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
init(context);
}
private void init(Context context){
//使用xml中的布局
LayoutInflater.from(context).inflate(R.layout.filpped_button,this, true);
mButton=findViewById(R.id.mButton);
buttonText=findViewById(R.id.buttonText);
}
//测量子View
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureChildren(widthMeasureSpec, heightMeasureSpec);
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
//遍历子元件
// int childCount = this.getChildCount();
// for (int i = 0; i < childCount; i++) {
// View child = this.getChildAt(i);
// this.measureChild(child, widthMeasureSpec, heightMeasureSpec);
// int cw = child.getMeasuredWidth();
// int ch = child.getMeasuredHeight();
// }
}
//排列子View的位置
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int childTop = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
child.layout(0, childTop,child.getMeasuredWidth(), childTop + child.getMeasuredHeight());
childTop = childTop + child.getMeasuredHeight();
}
}
}
}3.在Activity的布局中直接使用
现在可以看到一个最基本的自定义控件已经可以使用了。
二.接下来是重点，控件真正“自定义”的部分。
1.添加自定义事件
a.先定义自定义事件接口
/**
* 定义接口
*/
public interface IMyClick{
public void onMyClick(String str);
}
/**
* 初始化接口变量
*/
IMyClick iMyClick=null;
/**
* 自定义事件监听
* @param _iMyClick
*/
public void setOnMyClickListener(IMyClick _iMyClick){
iMyClick=_iMyClick;
}b.添加按钮点击事件的监听并调用接口传参
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
iMyClick.onMyClick("clicked me");
flipMe();
}
});c.父级Activity监听事件
fButton=(flippedButton) findViewById(R.id.flippedButton);
fButton.setOnMyClickListener(new flippedButton.IMyClick(){
@Override
public void onMyClick(String str) {
Log.d(LOG_TAG,str);
}
});2.绘制按钮翻转的动画
这里的3d变换需要用到Camera（android.graphics.Camera）、Matrix。
这里可以想象成用Camera拍摄原件的图形，并将拍摄得到的bitmap传入matrix再绘制到Canvas。
而改变Camera镜头角度就可以得到缩放变形后的图像以实现3d效果。
参考官方demo里的这个工具类的范例Rotate3dAnimation.java（其实是照搬)
a.先建一个3d变换的工具类:
package net.codepig.customviewdemo.model;
import android.graphics.Camera;//注意使用的是graphics里的而不是hardware里的
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.graphics.Matrix;
/**
* An animation that rotates the view on the Y axis between two specified angles.
* This animation also adds a translation on the Z axis (depth) to improve the effect.
*/
public class Rotate3dAnimation extends Animation {
private final float mFromDegrees;
private final float mToDegrees;
private final float mCenterX;
private final float mCenterY;
private final float mDepthZ;
private final boolean mReverse;
private Camera mCamera;
/**
* Creates a new 3D rotation on the Y axis. The rotation is defined by its
* start angle and its end angle. Both angles are in degrees. The rotation
* is performed around a center point on the 2D space, definied by a pair
* of X and Y coordinates, called centerX and centerY. When the animation
* starts, a translation on the Z axis (depth) is performed. The length
* of the translation can be specified, as well as whether the translation
* should be reversed in time.
*
* @param fromDegrees the start angle of the 3D rotation
* @param toDegrees the end angle of the 3D rotation
* @param centerX the X center of the 3D rotation
* @param centerY the Y center of the 3D rotation
* @param reverse true if the translation should be reversed, false otherwise
*/
public Rotate3dAnimation(float fromDegrees, float toDegrees, float centerX, float centerY, float depthZ, boolean reverse) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;
mCenterX = centerX;
mCenterY = centerY;
mDepthZ = depthZ;
mReverse = reverse;
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
mCamera = new Camera();
}
/**
*
* @param interpolatedTime 动画时间点，类似百分比
* @param t
*/
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
final float fromDegrees = mFromDegrees;
float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
final float centerX = mCenterX;
final float centerY = mCenterY;
final Camera camera = mCamera;
final Matrix matrix = t.getMatrix();
camera.save();
if (mReverse) {//远离
camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
} else {//靠近
camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
}
camera.rotateY(degrees);
camera.getMatrix(matrix);
camera.restore();
//移动旋转中心到布局中心
matrix.preTranslate(-centerX, -centerY);
matrix.postTranslate(centerX, centerY);
}
}注意：使用的是graphics里的Camera而不是hardware里的
注意：其中的centerX和centerY是中心点位置。由于Camera的变换是以（0,0）点为原点，所以需要进行变换。
b.调用这个Animation
final Rotate3dAnimation animation = new Rotate3dAnimation(0, 180,centerX, centerY, 0, true); animation.setDuration(500);//动画持续时间，默认为0 animation.setFillAfter(true);//这个false的话动画完了会复原 mButton.startAnimation(animation);
嗯，这样按钮就翻转了。
3.接下来做出按钮切换的效果
这里有两种方法。可以使用两个按钮一起翻转，也可以一个按钮翻90后改变样式再翻回来。
我这里使用一个按钮的方案。
先设置两种状态的动画。（注意在onMeasure后设置，不然中心位置定位到0，0了）
animationF = new Rotate3dAnimation(0, 90,centerX, centerY, 0, true); animationF.setDuration(500);//动画持续时间，默认为0 animationF.setFillAfter(true);//这个false的话动画完了会复原 animationB = new Rotate3dAnimation(-90, 0,centerX, centerY, 0, true); animationB.setDuration(500); animationB.setFillAfter(true);
给0-90度翻转的动画增加监听，动画完成时根据状态标识改变样式和文字，然后再从-90-0度翻转的动画。
animationF.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
if (!showBack) {
buttonText.setText("BACK BUTTON");
mButton.setBackgroundColor(getResources().getColor(R.color.colorAccent));
} else { // 背面朝上
buttonText.setText("FRONT BUTTON");
mButton.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
}
mButton.startAnimation(animationB);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});三.一个问题：显示不全
翻转的时候发现3d变换扩大了的部分超过了空间原先的显示区域而没有显示出来。
这里涉及到margin和padding的处理。
先给mButton的布局增加margin。
在onMeasure处理自定义view的margin和padding。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureChildren(widthMeasureSpec, heightMeasureSpec);
centerX=mButton.getMeasuredWidth()/ 2;
centerY=mButton.getMeasuredHeight() / 2;
mWidth = 0;
mHeight = 0;
//margin
marginLeft = 0;
marginTop = 0;
marginRight = 0;
marginBottom = 0;
//padding
paddingLeft = getPaddingLeft();
paddingTop = getPaddingTop();
paddingRight = getPaddingRight();
paddingBottom = getPaddingBottom();
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View childView = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams();
measureChild(childView, widthMeasureSpec, heightMeasureSpec);
viewsHeight += childView.getMeasuredHeight();
viewsWidth = Math.max(viewsWidth, childView.getMeasuredWidth());
marginLeft = Math.max(0,lp.leftMargin);//最大左边距
marginTop += lp.topMargin;//上边距之和
marginRight = Math.max(0,lp.rightMargin);//最大右边距
marginBottom += lp.bottomMargin;//下边距之和
}
mWidth = getMeasuredWidth() + paddingLeft + paddingRight + marginLeft + marginRight;
mHeight = getMeasuredHeight() + paddingBottom + paddingTop + marginTop + marginBottom;
setMeasuredDimension(measureWidth(widthMeasureSpec, mWidth), measureHeight(heightMeasureSpec, mHeight));
//动画
animationF = new Rotate3dAnimation(0, 90,centerX, centerY, 0, true);
animationF.setDuration(500);//动画持续时间，默认为0
animationF.setFillAfter(true);//这个false的话动画完了会复原
animationB = new Rotate3dAnimation(-90, 0,centerX, centerY, 0, true);
animationB.setDuration(500);
animationB.setFillAfter(true);
animationF.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
if (showBack) {
buttonText.setText("BACK BUTTON");
mButton.setBackgroundColor(getResources().getColor(R.color.colorAccent));
} else { // 背面朝上
buttonText.setText("FRONT BUTTON");
mButton.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
}
mButton.startAnimation(animationB);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}到此这篇关于如何在Android中对按钮进行翻转的文章就介绍到这了,更多相关如何在Android中对按钮进行翻转的内容请搜索创新互联以前的文章或继续浏览下面的相关文章希望大家以后多多支持创新互联！
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