虽然实现自定义开关，通常情况下都是继承View，比较合理方便快捷一些
但是我今天想去继承ViewGroup来实现自定义开关来玩玩
效果图：
布局代码：
<!-- 自定义开关ViewGroup版 -->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myswitch="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".upgrade.MainActivity"> <custom.view.upgrade.my_switch_viewgroup.MySwitch2
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerInParent="true"
android:background="#33F00000"> </custom.view.upgrade.my_switch_viewgroup.MySwitch2> </RelativeLayout>
效果：
布局代码：
<!-- 自定义开关ViewGroup版 -->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myswitch="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".upgrade.MainActivity"> <custom.view.upgrade.my_switch_viewgroup.MySwitch2
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerInParent="true"
android:background="#33F00000"> <!-- 第一个子控件 -->
<ImageView
android:id="@+id/iv_switch_bg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/switch_background"/> <!-- 第二个子控件 -->
<ImageView
android:id="@+id/iv_switch_drag"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/switch_drag"/> </custom.view.upgrade.my_switch_viewgroup.MySwitch2> </RelativeLayout>
自定义开关继承ViewGroup代码：
package custom.view.upgrade.my_switch_viewgroup; import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup; public class MySwitch2 extends ViewGroup implements View.OnClickListener , View.OnTouchListener { private static final String TAG = MySwitch2.class.getSimpleName(); private View switchBackground;
private View switchGrag; private int switchBackgroundWidth;
private int switchBackgroundHeight;
private int switchGragWidth;
private int switchGragHeight; private boolean onCreate = false; // 开关的状态
private boolean switchStatus; public MySwitch2(Context context, AttributeSet attrs) {
super(context, attrs); // 如果是这样写的话，是给整个粉红色正方形区域都设置了点击事件
// setOnClickListener(this);
} @Override
protected void onFinishInflate() {
super.onFinishInflate(); switchBackground = getChildAt(0);
switchGrag = getChildAt(1); onCreate = true; // 给子控件设置点击事件
switchBackground.setOnClickListener(this);
switchGrag.setOnClickListener(this); // 给子控件设置Touch事件
switchBackground.setOnTouchListener(this);
switchGrag.setOnTouchListener(this);
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 测量第一个子控件
LayoutParams switchBgParams = switchBackground.getLayoutParams();
switchBackground.measure(switchBgParams.width, switchBgParams.height); // 测量第二个子控件
LayoutParams switchGragParams = switchGrag.getLayoutParams();
switchGrag.measure(switchGragParams.width, switchGragParams.height); // -2 代表是wrap_content
// Log.d(TAG, "测量方法>>> switchGragParams.width" + switchGragParams.width); // 得到测量后的高和宽
if (onCreate) {
onCreate = false;
switchBackgroundWidth = switchBackground.getMeasuredWidth();
switchBackgroundHeight = switchBackground.getMeasuredHeight();
switchGragWidth = switchGrag.getMeasuredWidth();
switchGragHeight = switchGrag.getMeasuredHeight();
} // 在拖动开关的时候，测量会执行很多次,因为在拖动的过程中，开关Grag会的测量宽度会不断变化
// Log.d(TAG, "测量方法>>> switchBackgroundWidth:" + switchBackgroundWidth + " switchGragWidth:" + switchGragWidth);
} @Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// 给子控件排版指定位置
switchBackground.layout(
getMeasuredWidth() / 2 - switchBackground.getWidth() / 2,
getMeasuredHeight() / 2 - switchBackground.getHeight() / 2,
switchBackground.getMeasuredWidth() + (getMeasuredWidth() / 2 - switchBackground.getWidth() / 2),
switchBackground.getMeasuredHeight() + (getMeasuredHeight() / 2 - switchBackground.getHeight() / 2)); /*switchGrag.layout(
getMeasuredWidth() / 2 - (switchGrag.getWidth() / 2),
getMeasuredHeight() /2 - (switchGrag.getHeight() / 2),
switchGrag.getMeasuredWidth() + getMeasuredWidth() / 2 - (switchGrag.getWidth() / 2),
switchGrag.getMeasuredHeight() + getMeasuredHeight() /2 - (switchGrag.getHeight() / 2));*/ int gragL = getMeasuredWidth() / 2 - (switchBackground.getWidth() / 2);
int gragT = getMeasuredHeight() / 2 - (switchGrag.getHeight() / 2);
switchGrag.layout(
gragL,
gragT,
switchGrag.getMeasuredWidth() + gragL,
switchGrag.getMeasuredHeight() + gragT); // 动的是两个子控件
// scrollTo(90, 0);
} /**
* 打开开关
* @return
*/
/*private int getOpenSwitch() {
return getMeasuredWidth() / 2;
}*/ /**
* 关闭开关
* @return
*/
/*private int getCloseSwitch() {
return getMeasuredWidth() / 2 - (switchBackground.getWidth() / 2);
}*/ /**
* 开关滑动的按钮
* @param move
*/
private void setScrollMove(int move) { int countValue = (switchBackground.getMeasuredWidth() - switchGrag.getMeasuredWidth()) / 2; int countValue2 = (switchBackgroundWidth - switchGragWidth); // Log.d(TAG, "switchBackgroundWidth:" + switchBackgroundWidth + " switchGragWidth:" + switchGragWidth); Log.d(TAG, "move:" + move + " countValue:" + countValue +
" getMeasuredWidth():" + switchGrag.getMeasuredWidth()
+ " getWidth():" + switchGrag.getWidth() + " countValue2:" +countValue2); if (move < 0) {
move = 0;
} else if (move > countValue2) {
Log.d(TAG, "移动到最右边....");
move = countValue2;
}
// switchGrag.setPadding(move, 0, 0, 0);
setPaddingAction(move);
} /**
* 注意！这个是当前MySwitch2 ViewGroup的Touch事件
* @param event
* @return
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
} /**
* 此方法并不去绘制任何东西，Android自动回去绘制的
* @param canvas
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
} /**
* 是否可以点击
*/
private boolean isClick = true; @Override
public void onClick(View v) {
Log.d(TAG, "onClick() >>>>>>>>>>>>>>>> run");
Log.d(TAG, "onClick() isClick：" + isClick);
if (isClick) {
if (!switchStatus) {
// 说明是关闭状态，我要打开
moveResult = (switchBackgroundWidth - switchGragWidth);
} else {
moveResult = 0;
}
switchGrag.setPadding(moveResult, 0, 0, 0);
}
} private float downX;
private int moveResult;
private float downTempX; @Override
public boolean onTouch(View v, MotionEvent event) {
boolean touchResult = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = event.getX();
touchResult = false;
downTempX = downX;
isClick = true;
break;
case MotionEvent.ACTION_MOVE:
moveResult += (int) (event.getX() - downX);
setScrollMove(moveResult);
downX = event.getX(); if (Math.abs(event.getX() - downTempX) > 5) {
// 说明在滑动，就onTouch来消费掉了，不给onClick点击事件了
touchResult = true;
Log.d(TAG, "说明在滑动，就onTouch来消费掉了，不给onClick点击事件了");
isClick = false;
}
break;
case MotionEvent.ACTION_UP:
// int upLeft = 0;
if (moveResult > (switchBackgroundWidth - switchGragWidth) / 2) {
moveResult = switchBackgroundWidth - switchGragWidth;
} else if (moveResult < (switchBackgroundWidth - switchGragWidth) / 2) {
moveResult = 0;
} else if (moveResult <= 0){
moveResult = 0;
}
setPaddingAction(moveResult);
break;
default:
break;
}
return touchResult;
} private void setPaddingAction(int value) {
if (value > (switchBackgroundWidth - switchGragWidth) / 2) {
switchStatus = true;
} else if (value < (switchBackgroundWidth - switchGragWidth) / 2) {
switchStatus = false;
} else if (value <= 0){
switchStatus = false;
}
switchGrag.setPadding(value, 0,0,0);
}
}