Android-自定义UI与触摸事件

自定义（MyButton）按钮

package com.zking.administrator.g160628_android18_diyui_touch;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by Administrator on 2017/7/8 0008.
 */

public class MyButton extends View {

    public MyButton(Context context) {
        super(context);
    }

    public MyButton(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public MyButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public MyButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    /**
     *
     * @param canvas 画布
     *         Paint  画笔
     */
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.drawColor(Color.RED);
        //实例化路径
        Path path=new Path();
        path.moveTo(100,100);
        path.lineTo(300,100);
        path.lineTo(100,300);
        path.lineTo(200,10);
        path.lineTo(250,300);
        path.lineTo(100,100);
        //实例化一个画笔
        Paint paint=new Paint();
        paint.setColor(Color.YELLOW);

        //设置空心
        paint.setStyle(Paint.Style.STROKE);
        //设置画笔的粗细
        paint.setStrokeWidth(20);

        //画路径
        canvas.drawPath(path,paint);

        //设置画笔的粗细
        paint.setStrokeWidth(3);
        paint.setColor(Color.GREEN);
        //设置字的大小
        paint.setTextSize(38);
        //画文字
        canvas.drawText("呵呵呵",150,150,paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.i("test","自定义的按钮的触摸事件---->回调");
        return false;
    }
}

MainActivity.java

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    //设置宽和高
    setMeasuredDimension(500,300);
}

package com.zking.administrator.g160628_android18_diyui_touch;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;public class MainActivity extends AppCompatActivity { private MyButton mbtn_main_button; private LinearLayout root; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mbtn_main_button = (MyButton) findViewById(R.id.mbtn_main_button); root = (LinearLayout) findViewById(R.id.root); //给自定义按钮设置触摸事件 mbtn_main_button.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { Log.i("test","自定义的按钮的触摸事件---->监听"); return false; } }); //给root设置触摸事件 root.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { Log.i("test","自定义的按钮所在布局的触摸事件---->监听"); return false; } }); } @Override public boolean onTouchEvent(MotionEvent event) { Log.i("test","自定义的按钮所在Activity的触摸事件---->回调"); return true; }
//第二种设置高和宽的方法：用Java代码重写onMeasure方法
@Override
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec){
super.onMeasure(widthMeasureSpec,HeightMeasureSpec);
//设置宽和高
setMeasureDimension(400,500);
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/root"
    tools:context="com.zking.administrator.g160628_android18_diyui_touch.MainActivity">
    <!--设置高和宽第一种方法:在xml中直接设置-->
    <com.zking.administrator.g160628_android18_diyui_touch.MyButton
        android:layout_width="300px"
        android:layout_height="300px"
        android:id="@+id/mbtn_main_button"
        />
   <com.zking.administrator.g160628_android18_diyui_touch.MyButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/mbtn_main_button"
        />

</LinearLayout>