最近在看《Android群英传》里看到的一个自定义效果
亲手把它实现了
在此记录
package csu.lzw.reviewandroid;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.widget.TextView;/*** Created by Allen_Binan on /4/1.*/public class BlockTextView extends TextView {private Paint mInnerPaint;private Paint mOuterPaint;public BlockTextView(Context context) {super(context);}public BlockTextView(Context context, AttributeSet attrs) {super(context, attrs);}public BlockTextView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onDraw(Canvas canvas) {//外层画笔mOuterPaint=new Paint();mOuterPaint.setColor(Color.BLACK);mOuterPaint.setStyle(Paint.Style.FILL);//内层画笔mInnerPaint=new Paint();mInnerPaint.setColor(Color.WHITE);mInnerPaint.setStyle(Paint.Style.FILL);//绘制外层canvas.drawRect(0,0,getMeasuredWidth(),getMeasuredHeight(),mOuterPaint);//绘制内层canvas.drawRect(10,10,getMeasuredWidth()-10,getMeasuredHeight()-10,mInnerPaint);canvas.save();canvas.translate(10, 0);super.onDraw(canvas);canvas.restore();}}
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"><csu.lzw.reviewandroid.BlockTextViewandroid:layout_width="match_parent"android:layout_height="80dp"android:layout_margin="20dp"android:gravity="center"android:text="Hello World!"/></LinearLayout>
运行效果
接着又通过自定义属性，将其边框和背景的颜色改为可以在XML布局中自行配制的。
自定义属性
<declare-styleable name="BlockTextView"><attr name="outBlockColor" format="color"/><attr name="InBlockColor" format="color"/></declare-styleable>
界面布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"xmlns:app="/apk/res-auto"android:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"><csu.lzw.reviewandroid.BlockTextViewandroid:layout_width="match_parent"android:layout_height="80dp"android:layout_margin="20dp"app:outBlockColor="@android:color/holo_red_light"app:InBlockColor="@android:color/holo_blue_bright"android:gravity="center"android:text="Hello World!"/></LinearLayout>
package csu.lzw.reviewandroid;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.widget.TextView;/*** Created by Allen_Binan on /4/1.*/public class BlockTextView extends TextView {private Paint mInnerPaint;private Paint mOuterPaint;private int mInnerColor;private int mOuterColor;public BlockTextView(Context context) {super(context);}public BlockTextView(Context context, AttributeSet attrs) {super(context, attrs);TypedArray ta=context.obtainStyledAttributes(attrs,R.styleable.BlockTextView);mInnerColor=ta.getColor(R.styleable.BlockTextView_InBlockColor,0);mOuterColor=ta.getColor(R.styleable.BlockTextView_outBlockColor,0);ta.recycle();}public BlockTextView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onDraw(Canvas canvas) {//外层画笔mOuterPaint=new Paint();mOuterPaint.setColor(mOuterColor);mOuterPaint.setStyle(Paint.Style.FILL);//内层画笔mInnerPaint=new Paint();mInnerPaint.setColor(mInnerColor);mInnerPaint.setStyle(Paint.Style.FILL);//绘制外层canvas.drawRect(0,0,getMeasuredWidth(),getMeasuredHeight(),mOuterPaint);//绘制内层canvas.drawRect(10,10,getMeasuredWidth()-10,getMeasuredHeight()-10,mInnerPaint);canvas.save();canvas.translate(10, 0);super.onDraw(canvas);canvas.restore();}}
然后的运行效果
