自定义开关ToggleButton
package com.example.test;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
//------------MainActivity中----------------------
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//找到控件
TooggleButtonCustom buttonCustom=(TooggleButtonCustom) findViewById(R.id.custom_button);
//设置背景图片
buttonCustom.setBackGroundPic(R.drawable.switch_background);
//设置前边的图片
buttonCustom.setForePic(R.drawable.slide_button_background);
//设置默认状态
buttonCustom.setState(false);
}
}
//-------------自定义控件TooggleButtonCustom------继承view--------------------
package com.example.test;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class TooggleButtonCustom extends View{
private Bitmap backBitmap;//背景图片
private Bitmap foreBitmap;//上面的图片
private boolean state=false;
private int currentX;//获得位置
boolean isTouching;//是否是触摸
//有style资源文件时使用
public TooggleButtonCustom(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
// xml布局文件中使用
public TooggleButtonCustom(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
//java代码中创建时使用这个构造方法
public TooggleButtonCustom(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
//设置背景图片
public void setBackGroundPic(int switchBackground) {
backBitmap = BitmapFactory.decodeResource(getResources(),switchBackground);
}
//设置前边图片
public void setForePic(int slideButtonBackground) {
foreBitmap = BitmapFactory.decodeResource(getResources(),slideButtonBackground);
}
//设置开关状态
public void setState(boolean b) {
this.state=b;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(backBitmap.getWidth(), backBitmap.getHeight());
}
@Override
protected void onDraw(Canvas canvas) {
// 1.平铺背景图片
canvas.drawBitmap(backBitmap, 0, 0, null);
if (isTouching) {
int left = currentX - foreBitmap.getWidth()/2;
//两个问题 ,位置不在中心,,移出范围
if (left < 0) {
left = 0;
}else if (left > backBitmap.getWidth() - foreBitmap.getWidth()) {
left = backBitmap.getWidth() - foreBitmap.getWidth();
}
canvas.drawBitmap(foreBitmap, left, 0, null);
}else {
// 2.根据状态去绘制 上面图片
if (state) {
// 右边
canvas.drawBitmap(foreBitmap,
backBitmap.getWidth() - foreBitmap.getWidth(), 0, null);
} else {
// 左边
canvas.drawBitmap(foreBitmap, 0, 0, null);
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isTouching = true;
currentX = (int) event.getX();
break;
case MotionEvent.ACTION_MOVE:
isTouching = true;
currentX = (int) event.getX();
break;
case MotionEvent.ACTION_UP:
isTouching = false;
currentX = (int) event.getX();
state = currentX > backBitmap.getWidth()/2;
break;
default:
break;
}
invalidate();//重复绘制控件 自动调用OnDraw()
return true;// 自己处理触摸事件
}
}
//------------------------主布局文件---------------------------
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<com.example.test.TooggleButtonCustom
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:id="@+id/custom_button"></com.example.test.TooggleButtonCustom>
</RelativeLayout>