自定义View类

通过自定义View类，可以自定义复杂的，按照自己需求的控件。

一个简单的例子

mainActivity.java 这个里面就是最普通的代码，但是给自定义的控件加上了一个onclick的时间

package com.example.test.com;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.Window;

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.main);

        MyView myView = (MyView) findViewById(R.id.myView);

        myView.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                Log.d("asdasd", ":asdasdasd");

            }

        });

    }

}

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="700dp"

    android:layout_height="300dp"

    android:orientation="horizontal"

    android:padding="10dp" >

	<!-- 自定义View -->

    <com.example.test.com.MyView

        android:id="@+id/myView"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent" />

</RelativeLayout>

MyView.java

package com.example.test.com;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.view.View;

public class MyView extends View {

    private Paint mPaint;

    public MyView(Context context) {

        super(context);

    }

    public MyView(Context context, AttributeSet attrs) {

        super(context, attrs);

        setFocusable(true);

        setClickable(true); //设置是否能点击

    }

    /**

     * 通过canvas 画控件

     */

    @Override

    public void onDraw(Canvas canvas) {

        super.onDraw(canvas);

        mPaint = new Paint();

        //设置画笔颜色

        mPaint.setColor(Color.RED);

        //设置填充

        mPaint.setStyle(Style.FILL);

        //画一个矩形,前俩个是矩形左上角坐标，后面俩个是右下角坐标

        canvas.drawRect(new Rect(10, 10, 100, 100), mPaint);

        mPaint.setColor(Color.BLUE);

        //绘制文字

        canvas.drawText("Hello WORLD", 10, 110, mPaint);

    }

}

结果：