Android描画简单圆形

最近又变成android开发了。。。上网看了本书，研究了下。。。其实，从qt过渡到android，虽说用的函数不一样。感觉思路都差不多呢。。。。

在activicy中布局：

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <ImageView        android:id="@+id/iv"        android:layout_width="match_parent"        android:layout_height="match_parent" />androidx.constraintlayout.widget.ConstraintLayout>

在MainActivity.java中添加如下代码：

package leavesc.hello.text_canvas;import androidx.appcompat.app.AppCompatActivity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.RectF;import android.os.Bundle;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {    private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv = (ImageView)findViewById(R.id.iv);        Bitmap bmpBuffer = Bitmap.createBitmap(500,800,Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bmpBuffer);        Paint paint = new Paint();        paint.setStyle(Paint.Style.STROKE);        RectF rect = new RectF(10,10,400,400);        paint.setColor(Color.GRAY);        canvas.drawOval(rect,    paint);        paint.setAntiAlias(true);        paint.setColor(Color.GREEN);        paint.setStyle(Paint.Style.STROKE);        paint.setStrokeWidth(3);        canvas.drawArc(rect,    -90,    90,    false,    paint);        iv.setImageBitmap(bmpBuffer);    }}

如果能加上java的timer使其动态描画就能得到圆形进度条的效果了。应该是这个思路吧

转载于:https://www.cnblogs.com/wxmwanggood/p/11282378.html

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