示例图:
MyView.java:
java
package com.example.demo;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
import com.example.myoomtest.R;
public class MyView extends View {
public MyView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
// super.onDraw(canvas);
//画笔
Paint paint = new Paint();
paint.setColor(Color.RED);
//设置画笔的风格,如 Style.FILL(实心)、
// Style.FILL_AND_STROKE(同时显示实心和空心)或 Style.STROKE(空心)。
paint.setStyle(Paint.Style.FILL);
//设置空心 边框 宽度
paint.setStrokeWidth(20.0f);
//在画布上画条线
/***
* xxxxxx
Y 000000
Y 000000
Y 000000
* */
canvas.drawLine(0,50,500,50,paint);//画一条直线
canvas.drawLine(100,0,100,200,paint);//画一条竖线
canvas.drawLine(300,0,600,200,paint);//画一条斜线
Paint paint2 = new Paint();
paint2.setStyle(Paint.Style.STROKE);//(空心)
paint2.setStrokeWidth(10);//边框大小
paint2.setARGB(100,120,255,100);
/**
* 画矩形 rect
* */
canvas.drawRect(100,300,300,500,paint2);
Paint paint3 = new Paint();
paint3.setStyle(Paint.Style.STROKE);//(空心)
paint3.setStrokeWidth(10);//边框线大小
paint3.setARGB(100,120,255,100);
/**
* x , y 位置
* 圆的 半径
* 画圆形 circle
* */
canvas.drawCircle(600f,600f,60f,paint3);
canvas.drawCircle(700f,700f,60f,paint);
/**画文字
* 基准线
* */
Paint paint4 = new Paint();
paint4.setARGB(100,120,255,0);
paint4.setTextSize(200);//文字大小
paint4.setStrokeWidth(10);//边框线大小
//基准线
canvas.drawLine(0,1000,1000,1000,paint4);
canvas.drawText("appblmqq",20,1000,paint4);
/**
* 绘制图片到画布
* */
Paint paint6 = new Paint();
canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.kk),200,1200,paint6);
}
}
MainActivity.java
java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
setContentView(new MyView(this));
}
}