自定义View,绘制图文混合

最新推荐文章于 2019-05-22 09:44:03 发布

原创最新推荐文章于 2019-05-22 09:44:03 发布 · 367 阅读

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#自定义view

本文介绍了一个使用Android自定义View进行图形绘制的例子，包括圆形、弧形和文本的绘制过程。通过设置画笔样式、颜色及宽度等属性，演示了如何在自定义View中实现复杂的图形绘制。

package com.example.user.demopine;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;

/**
 * @author ${pym}
 * @creatDate 2017/9/6 15:47
 * @description ${description}
 * @updateAuthor ${Author}
 * @updateDate$ 2017/9/6 15:47
 */

public class View extends android.view.View {
    private int w;
    private int h;

    public View(Context context) {
        super(context);
    }

    public View(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    public View(Context context, int w, int h) {
        super(context);
        this.w = w;
        this.h = h;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        String text = "测试";
        Paint pain = new Paint();
        pain.setAntiAlias(true);
        pain.setColor(Color.RED);
        pain.setStyle(Paint.Style.STROKE);
        pain.setStrokeWidth(2);
        float radius = Math.min(w, h) / 2;
        Rect rect = new Rect(w, h, h, h);
        canvas.drawCircle(rect.centerX(), rect.centerY(), radius, pain);

        RectF rectF = new RectF(w/2, h/2, w+(w/2), h+(h/2));
        pain.setColor(Color.RED);
        pain.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.drawArc(rectF, 0, 180, false, pain);

        pain.setStyle(Paint.Style.FILL_AND_STROKE);
        pain.setTextSize(28);
        pain.setStrokeWidth(0);
        canvas.drawText(text, rect.centerX() - 20, rect.centerY() - 20, pain);
        pain.setColor(Color.WHITE);
        pain.setStrokeWidth(5);
        canvas.drawLine(rect.centerX(), rect.centerY() + 25, rect.centerX(), rect.centerX() + 75, pain);
        canvas.drawLine(rect.centerX() - 25, rect.centerX() + 50, rect.centerX() + 25, rect.centerY() + 50, pain);
    }

}


package com.example.user.demopine;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.LinearLayout;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LinearLayout ll1 = (LinearLayout) findViewById(R.id.ll);
        LinearLayout ll2 = (LinearLayout) findViewById(R.id.ll2);
        View view2 = new View(this, 800, 800);
        ll2.addView(view2);

    }
}