自定义控件

来源：互联网发布：api python 编辑：程序博客网时间：2024/06/09 21:14

package com.qianqian.day4;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button btn = new Button(this);        findViewById(R.id.cv).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {//                ((CustemView)v).setPaint();                Toast.makeText(MainActivity.this, "dddd", Toast.LENGTH_SHORT).show();            }        });    }}

package com.qianqian.day4;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import java.util.Random;/** * 作用：测量方法 * 摆放的位置--在自定义viewgroup的时候需要使用 * 用来绘制 * 作者：李倩 on 2017/9/28 09:30 */public class CurrView extends View{    Paint paint;    char[] array=new char[4];    Random r=new Random();    float downX=0;    //在类中直接使用new关键字实例化控件时使用的构造方法    public CurrView(Context context) {        super(context);        init();    }//在布局文件中创建的控件 使用的是第二个构造方法    public CurrView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public CurrView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        paint=new Paint();        //抗锯齿        paint.setAntiAlias(true);        paint.setColor(Color.RED);        paint.setStrokeWidth(10);    }    //画布    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);     /*   //直线        canvas.drawLine(0,0,100,100,paint);        //圆，空心圆        paint.setColor(Color.RED);        paint.setStyle(Paint.Style.STROKE);        canvas.drawCircle(100,100,50,paint);        //加载图片        Bitmap bit= BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);        canvas.drawBitmap(bit,100,100,paint);*/        for (int i = 0; i <4 ; i++) {            String a=r.nextInt(10)+"";            char[] temp=a.toCharArray();            array[i]=temp[0];        }        canvas.drawRect(100,100,300,200,paint);        paint.setColor(Color.YELLOW);        paint.setTextSize(80);        canvas.drawText(array,0,4,100,200,paint);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()){            case  MotionEvent.ACTION_DOWN:                paint.setColor(Color.BLUE);                invalidate();                break;            case  MotionEvent.ACTION_MOVE:                break;            case  MotionEvent.ACTION_UP:                float upX=event.getX();                if (upX>100&&upX<200) {                    paint.setColor(Color.RED);                    invalidate();                }                break;        }        return super.onTouchEvent(event);    }    public  void  setPaint(){        paint.setColor(Color.BLACK);        invalidate();    }}


<?xml version="1.0" encoding="utf-8"?><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="com.qianqian.day4.MainActivity">    <com.qianqian.day4.CurrView        android:id="@+id/cv"        android:layout_width="match_parent"        android:layout_height="match_parent"         /></RelativeLayout>

阅读全文

0 0