Android开发-自定义View-AndroidStudio(八)自定义View初体验

时间：2022-10-27 15:53:19
转载请注明出处： http://blog.csdn.net/iwanghang/article/details/53783417
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老规矩，先上效果图，看个效果，如果符合你的项目或者确定你要了解的内容，再往下看吧：
Android开发-自定义View-AndroidStudio(八)自定义View初体验
MainActivity.java： 
package com.iwanghang.autoattribute;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}
MyAttributeView.java： 
package com.iwanghang.autoattribute;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.util.TypedValue;import android.view.View;public class MyAttributeView extends View {    private int age;    private String name;    private int text_size;    private Bitmap bg;    private Bitmap bg2;    public MyAttributeView(Context context, AttributeSet attrs) {        super(context, attrs);        // 获取属性三种方式        // 1、用命名空间获取        String my_name = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_name");        String my_age = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_age");        String my_bg = attrs.getAttributeValue("http://schemas.android.com/apk/res-auto","my_bg");        System.out.println("ceshi 用命名空间获取 = my_name = "+ my_name + "， my_age = "+ my_age + "， my_bg = "+ my_bg);        // 2、遍历属性集合        for (int i = 0; i <attrs.getAttributeCount() ; i++) {            System.out.println("ceshi 遍历属性集合 = " + attrs.getAttributeName(i) + " | " + attrs.getAttributeValue(i));        }        // 3、使用系统工具，获取属性        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.MyAttributeView);        for (int i = 0; i <typedArray.getIndexCount() ; i++) {            int index = typedArray.getIndex(i);            switch (index){                case R.styleable.MyAttributeView_my_age:                    age = typedArray.getInt(index,0);                    break;                case R.styleable.MyAttributeView_my_name:                    name = typedArray.getString(index);                    System.out.println("ceshi2 name = " + name);                    break;                case R.styleable.MyAttributeView_text_size:                    text_size = typedArray.getDimensionPixelSize(index, 0);                    break;                case R.styleable.MyAttributeView_my_bg:                    Drawable drawable = typedArray.getDrawable(index);                    BitmapDrawable drawable1 = (BitmapDrawable) drawable;                    bg = drawable1.getBitmap();                    break;                case R.styleable.MyAttributeView_my_bg_2:                    Drawable drawable3 = typedArray.getDrawable(index);                    BitmapDrawable drawable4 = (BitmapDrawable) drawable3;                    bg2 = drawable4.getBitmap();                    break;            }        }        // 记得回收        typedArray.recycle();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint paint = new Paint();        if (text_size != 0) {            // Layout中如果设置字体大小，则设置为Layout中字体大小            paint.setTextSize(text_size);        }else {            // Layout中如果没有设置字体大小，则20sp            paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 20, getResources().getDisplayMetrics()));        }        canvas.drawText(name,50,50,paint);        canvas.drawText(String.valueOf(age),50,100,paint);        //canvas.drawBitmap(bg,50,150,paint);        canvas.drawBitmap(bg,null,new Rect(0,0,650,500),null);        canvas.drawBitmap(bg2,null,new Rect(100,450,550,750),null);    }}
activity_main.xml： 
<?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"    xmlns:iwanghang="http://schemas.android.com/apk/res-auto"    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.iwanghang.autoattribute.MainActivity">    <com.iwanghang.autoattribute.MyAttributeView        iwanghang:my_age="100"        iwanghang:my_name="_iwanghang_"        iwanghang:text_size="30sp"        iwanghang:my_bg="@drawable/christmas"        iwanghang:my_bg_2="@drawable/c2"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <!--如果删除这句，默认字体大小为20sp-->    <!--iwanghang:text_size="30sp"--></RelativeLayout>
attrs.xml： 
<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyAttributeView">        <attr name="my_age" format="integer"/>        <attr name="my_name" format="string" />        <attr name="text_size" format="dimension" />        <attr name="my_bg" format="reference|color"/>        <attr name="my_bg_2" format="reference|color"/>    </declare-styleable></resources>


转载请注明出处： http://blog.csdn.net/iwanghang/article/details/53783417



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