自定义view（一）自定义属性

1、在values文件夹下新建自己的属性文件myView_attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyViewStyle">        <attr name="bg_color" format="color" />    </declare-styleable></resources>

定义自己想要的属性.，类型有这些。

2、在xml中使用

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:bruce="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.supermap.myapplication.MainActivity">    <com.supermap.myapplication.MyView        android:layout_width="match_parent"        android:layout_height="match_parent"        bruce:bg_color="@color/colorPrimaryDark" /></LinearLayout>

这里使用自己的命名空间。使用别名bruce或者其他的。

3、在view中获取自己定义的属性的值

private void getAttrs(Context context, AttributeSet attrs) {    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyViewStyle);    if (typedArray != null) {        backgroundColor = typedArray.getColor(R.styleable.MyViewStyle_bg_color, Color.WHITE);        typedArray.recycle();    }}

完整代码为：

package com.supermap.myapplication;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by Administrator on 2017/6/5 0005. */public class MyView extends View {    private int backgroundColor = Color.WHITE;    public MyView(Context context) {        this(context, null);    }    public MyView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initCommon(context, attrs);    }    /**     * 得到自定义的属性和初始化常用工具     *     * @param context     * @param attrs     */    private void initCommon(Context context, AttributeSet attrs) {        getAttrs(context, attrs);    }    private void getAttrs(Context context, AttributeSet attrs) {        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyViewStyle);        if (typedArray != null) {            backgroundColor = typedArray.getColor(R.styleable.MyViewStyle_bg_color, Color.WHITE);            typedArray.recycle();        }    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        return super.onTouchEvent(event);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(backgroundColor);    }}