android自定义组件
16lz
2021-01-23
官方文档
/Myselfcomponent/res/values/attrs.xml
<?xml version="1.0" encoding="utf-8"?>
activity_main.xml
MyView
package com.example.myselfcomponent;import android.R.integer;import android.R.style;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;/** * 自定义组件 * */public class MyView extends View{//画笔Paint paint;String text;public MyView(Context context) {super(context);paint=new Paint();paint.setColor(Color.BLACK);paint.setTextSize(28);// TODO Auto-generated constructor stub}public MyView(Context context,AttributeSet attrs) {// TODO Auto-generated constructor stubsuper(context, attrs);paint=new Paint();TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.MyView);int color=typedArray.getColor(R.styleable.MyView_textColor, 0xFFFFFF);float size=typedArray.getDimension(R.styleable.MyView_textSize, 20);text=typedArray.getString(R.styleable.MyView_text);paint.setColor(color);paint.setTextSize(size);//关闭资源typedArray.recycle();}/** * 初始化组件时被触发,进行组件的渲染 * Canvas 画布 * */@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);//设置画笔风格为实心paint.setStyle(Style.FILL);//绘制正方形canvas.drawRect(new Rect(10,10,90,90), paint);paint.setColor(Color.BLUE);canvas.drawText(text, 10, 110, paint);}}
MainActivity
package com.example.myselfcomponent;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity { @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}}
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