我有三个文件。在XML中，绘制函数和主要活动。 我在XML文件中的一些的LinearLayout。

I have three files. The XML, the draw function and the main Activity. I have some LinearLayout in my XML file.

 <LinearLayout android:orientation="horizontal"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:layout_weight="1">
            <LinearLayout android:layout_width="fill_parent"
                       android:layout_height="fill_parent"
                       android:layout_weight="1"
                       android:background="#ef3"
                       android:id="@+id/img01"/>
            <LinearLayout android:layout_width="fill_parent"
                       android:layout_height="fill_parent"
                       android:layout_weight="1"
                       android:background="#E8A2B4"
                       android:id="@+id/img02"/>
    </LinearLayout>

和我有平局的功能。

public class getBorder extends TextView {
    public getBorder(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint = new Paint();

        paint.setColor(android.graphics.Color.RED);

        canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint);
        canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint);
        canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1,
                this.getHeight() - 1, paint);
        canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1,
                this.getHeight() - 1, paint);
    }
}

这是主要的活动。

And this is the main Activity.

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final getBorder getBorder = new getBorder(this);
        final LinearLayout img01 = (LinearLayout) findViewById(R.id.img01);
        img01.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                getBorder.setWidth(100);
                getBorder.setHeight(100);
                img01.addView(getBorder);
            }
        });

    }

该方案可以借鉴边框，但规模没有适合的LinearLayout。当我再次点击的LinearLayout，程序粉碎。有人能帮助我吗？另一件事，我要画两个圈中的LinearLayout的中心，但我怎么能计算出中心坐标？

The program could draw border but the size didn't fit the LinearLayout. And when I click the LinearLayout again, the program crushed. Could someone help me? Another thing, I want draw two circles in the center of the LinearLayout, but how could I figure out the center coordinates?

推荐答案

你真的需要做到这一点编程？

Do you really need to do that programmatically?

只是考虑标题：你可以使用一个ShapeDrawable作为机器人：背景...

Just considering the title: You could use a ShapeDrawable as android:background…

例如，让我们定义 RES /绘制/ my_custom_background.xml 为：

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
  <corners
      android:radius="2dp"
      android:topRightRadius="0dp"
      android:bottomRightRadius="0dp"
      android:bottomLeftRadius="0dp" />
  <stroke
      android:width="1dp"
      android:color="@android:color/white" />
</shape>

和定义的android：背景=@可绘制/ my_custom_background

and define android:background="@drawable/my_custom_background".

我没有测试过，但它应该工作。

I've not tested but it should work.

更新：

我觉得这是更好地利用XML形状绘制资源的权力，如果适合您的需要。着有从头开始的项目（为Android-8），定义RES /布局/ main.xml中

I think that's better to leverage the xml shape drawable resource power if that fits your needs. With a "from scratch" project (for android-8), define res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/border"
    android:padding="10dip" >
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World, SOnich"
    />
[... more TextView ...]
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World, SOnich"
    />
</LinearLayout>

和 RES /绘制/ border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
   <stroke
        android:width="5dip"
        android:color="@android:color/white" />
</shape>

上报工作姜饼设备上。请注意，您需要有关安卓填充的的LinearLayout到机器人：宽度外形/中风的价值。请不要使用 @android：彩色/白色在最终的应用程序，而是一个定义的项目颜色

Reported to work on a gingerbread device. Note that you'll need to relate android:padding of the LinearLayout to the android:width shape/stroke's value. Please, do not use @android:color/white in your final application but rather a project defined color.

您可以使用安卓背景=@可绘制/边框机器人：填充=10dip到每个的LinearLayout从您提供的样本

You could apply android:background="@drawable/border" android:padding="10dip" to each of the LinearLayout from your provided sample.

至于你显示一些圈子里的LinearLayout的背景，我在和插图/缩放/层绘制资源（与其他职位的