[自定义控件学习]Textview

1 旋转文字的TextView

package com.example.view_textview;

public class MyTextView extends TextView {
	private int degree;
	public MyTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.MyView);
		int degree = array.getColor(R.styleable.MyView_degree, 0); // 提供默认值，放置未指定
		this.degree = degree;
		array.recycle(); // 一定要调用，否则这次的设定会对下次的使用造成影响
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		canvas.rotate(degree, getMeasuredWidth() / 2, getMeasuredHeight() / 2);
		super.onDraw(canvas);
	}

}

 <declare-styleable name="MyView">
        <attr name="degree" format="integer" />
    </declare-styleable>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:my="http://schemas.android.com/apk/res/com.example.view_textview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MainActivity" >

    <com.example.view_textview.MyTextView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:text="@string/hello_world"
        android:textColor="#FF0000"
        my:degree="-80" />

</RelativeLayout>