public class MyView extends View {
  
  private String mtext;
  private int msrc;

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

  public MyView(Context context, AttributeSet attrs) {
    super(context, attrs);
    int resourceId = 0;
    int textId = attrs.getAttributeResourceValue(null, "Text",0);
    int srcId = attrs.getAttributeResourceValue(null, "Src", 0);
    mtext = context.getResources().getText(textId).toString();
    msrc = srcId;
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    Paint paint = new Paint();
    paint.setColor(Color.RED);
    InputStream is = getResources().openRawResource(msrc); 
        Bitmap mBitmap = BitmapFactory.decodeStream(is);
        int bh = mBitmap.getHeight();
        int bw = mBitmap.getWidth();
      canvas.drawBitmap(mBitmap, 0,0, paint);
    //canvas.drawCircle(40, 90, 15, paint);
    canvas.drawText(mtext, bw/2, 30, paint);
  }
}

<?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" >

  <com.example.myimageview2.MyView
    android:id="@+id/myView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    Text="@string/hello_world"
    Src="@drawable/xh"/>

</LinearLayout>

public class MyImageView extends LinearLayout {

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

  public MyImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    int resourceId = -1;
    TypedArray typedArray = context.obtainStyledAttributes(attrs,
        R.styleable.MyImageView);
    ImageView iv = new ImageView(context);
    TextView tv = new TextView(context);
    int N = typedArray.getIndexCount();
    for (int i = 0; i < N; i++) {
      int attr = typedArray.getIndex(i);
      switch (attr) {
      case R.styleable.MyImageView_Oriental:
        resourceId = typedArray.getInt(
            R.styleable.MyImageView_Oriental, 0);
        this.setOrientation(resourceId == 1 ? LinearLayout.HORIZONTAL
            : LinearLayout.VERTICAL);
        break;
      case R.styleable.MyImageView_Text:
        resourceId = typedArray.getResourceId(
            R.styleable.MyImageView_Text, 0);
        tv.setText(resourceId > 0 ? typedArray.getResources().getText(
            resourceId) : typedArray
            .getString(R.styleable.MyImageView_Text));
        break;
      case R.styleable.MyImageView_Src:
        resourceId = typedArray.getResourceId(
            R.styleable.MyImageView_Src, 0);
        iv.setImageResource(resourceId > 0 ?resourceId:R.drawable.ic_launcher);
        break;  
      }
    }
    addView(iv);
    addView(tv);
    typedArray.recycle();
  }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>

  <declare-styleable name="MyImageView">
    <attr name="Text" format="reference|string"></attr>
    <attr name="Oriental" >
      <enum name="Horizontal" value="1"></enum>
      <enum name="Vertical" value="0"></enum>
    </attr>
    <attr name="Src" format="reference|integer"></attr>
  </declare-styleable>

</resources>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:uview="http://schemas.android.com/apk/res/com.example.myimageview2"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".MainActivity" >

  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" />

  <com.example.myimageview2.MyImageView
    android:id="@+id/myImageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    uview:Text="这是一个图片说明" 
    uview:Src="@drawable/tw"
    uview:Oriental="Vertical">
  </com.example.myimageview2.MyImageView>

</LinearLayout>

onFinishInflate() 回调方法，当应用从XML加载该组件并用它构建界面之后调用的方法
onMeasure() 检测View组件及其子组件的大小
onLayout() 当该组件需要分配其子组件的位置、大小时
onSizeChange() 当该组件的大小被改变时
onDraw() 当组件将要绘 制它的内容时
onKeyDown 当按下某个键盘时
onKeyUp 当松开某个键盘时
onTrackballEvent 当发生轨迹球事件时
onTouchEvent 当发生触屏事件时
onWindowFocusChanged(boolean) 当该组件得到、失去焦点时
onAtrrachedToWindow() 当把该组件放入到某个窗口时
onDetachedFromWindow() 当把该组件从某个窗口上分离时触发的方法
onWindowVisibilityChanged(int): 当包含该组件的窗口的可见性发生改变时触发的方法