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：
