自定义控件

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1. 自定义控件分两类，继承View做功能扩展，继承ViewGroup做复合控件

自定义一个button为例，如何自定义事件

KevinButton.java 控件

package com.example.uitest;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.MotionEvent;import android.widget.Button;public class KevinButton extends Button {private KevinClickListener kevinClickListener;public KevinButton(Context context) {super(context);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);Paint paint = new Paint();paint.setColor(Color.RED);canvas.drawRect(5, 5, 30, 30, paint);}public interface KevinClickListener{public void clickChangeColor();}public void setKevinClickListener(KevinClickListener kevinClickListener){this.kevinClickListener = kevinClickListener;}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_UP:long time = event.getEventTime()-event.getDownTime();if(time >= 2000 ){kevinClickListener.clickChangeColor();System.out.println("Time():"+time );}break;default:break;}return super.onTouchEvent(event);}}

SelfButtonActivity.java ; activity

public class SelfButtonActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);final KevinButton bt = new KevinButton(this);bt.setKevinClickListener(new KevinClickListener() {@Overridepublic void clickChangeColor() {Toast.makeText(SelfButtonActivity.this, "clickChangeColor", Toast.LENGTH_LONG).show();bt.setBackgroundColor(Color.GREEN);}});setContentView(bt);}}

如果将自定义控件放入到xml layout中的两种方法

如果控件是内部类，则用第2中view, 引用内部类的时候用$

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <com.example.uitest.KevinButton />    <view class="com.example.uitest.KevinButton"/></LinearLayout>

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