Android ShapeDrawable之OvalShape、RectShape、PaintDrawable、ArcShape



Android ShapeDrawable之OvalShape、RectShape、PaintDrawable、ArcShape

Android图形图像基础之OvalShape、RectShape、PaintDrawable、ArcShape。写一个例子说明。

准备一个布局，布局里面竖直方向排列若干TextView：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_margin="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="OvalShape"
        android:textColor="@android:color/white" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_margin="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="RectShape"
        android:textColor="@android:color/white" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_margin="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="PaintDrawable"
        android:textColor="@android:color/white" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_margin="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="ArcDrawable"
        android:textColor="@android:color/white" />

</LinearLayout>

上层Java代码把OvalShape、RectShape、PaintDrawable、ArcShape分别作为背景Drawable：

package zhangphil.app;

import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.PaintDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.ArcShape;
import android.graphics.drawable.shapes.OvalShape;
import android.graphics.drawable.shapes.RectShape;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //椭圆形形状
        OvalShape ovalShape = new OvalShape();
        ShapeDrawable drawable1 = new ShapeDrawable(ovalShape);
        drawable1.getPaint().setColor(Color.BLUE);
        drawable1.getPaint().setStyle(Paint.Style.FILL);
        findViewById(R.id.textView1).setBackgroundDrawable(drawable1);

        //矩形形状
        RectShape rectShape = new RectShape();
        ShapeDrawable drawable2 = new ShapeDrawable(rectShape);
        drawable2.getPaint().setColor(Color.RED);
        drawable2.getPaint().setStyle(Paint.Style.FILL);
        findViewById(R.id.textView2).setBackgroundDrawable(drawable2);

        //一个继承自ShapeDrawable更为通用、可以直接使用的形状
        PaintDrawable drawable3 = new PaintDrawable(Color.GREEN);
        drawable3.setCornerRadius(30);
        findViewById(R.id.textView3).setBackgroundDrawable(drawable3);

        //扇形、扇面形状
        //顺时针,开始角度30， 扫描的弧度跨度180
        ArcShape arcShape = new ArcShape(30, 180);
        ShapeDrawable drawable4 = new ShapeDrawable(arcShape);
        drawable4.getPaint().setColor(Color.YELLOW);
        drawable4.getPaint().setStyle(Paint.Style.FILL);
        findViewById(R.id.textView4).setBackgroundDrawable(drawable4);
    }
}

运行结果：