有时候Android自带的控件无法满足我们的某些要求，这时就需要我们自定义控件来实现这些功能。比如需要一个TextView里的字倾斜一定的角度，就需要自定义TextView。

package com.leigo.ratatetextview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.TextView;

/**
 * Created by Administrator on 2014/9/9.
 */
public class RotateTextView extends TextView {

    private static final int DEFAULT_DEGREES = 0;

    private int mDegrees;

    public RotateTextView(Context context) {
        super(context, null);
    }

    public RotateTextView(Context context, AttributeSet attrs) {
        super(context, attrs, android.R.attr.textViewStyle);

        this.setGravity(Gravity.CENTER);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RotateTextView);

        mDegrees = a.getDimensionPixelSize(R.styleable.RotateTextView_degree, DEFAULT_DEGREES);

        a.recycle();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth());
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.save();
        canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
        canvas.rotate(mDegrees, this.getWidth() / 2f, this.getHeight() / 2f);
        super.onDraw(canvas);
        canvas.restore();
    }

    public void setDegrees(int degrees) {
        mDegrees = degrees;
    }

}

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="RotateTextView">
        <attr name="degree" format="dimension" />
    </declare-styleable>
</resources>

用法：

1.xml

<com.leigo.ratatetextview.RotateTextView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/text"
        android:text="@string/hello_world"
        app:degree="10dp"
        android:padding="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" /></span>

RotateTextView  mText = (RotateTextView) findViewById (R.id.text);
mText.setDegrees(10);</span>

https://coding.net/u/leigo/p/RotateTextView/git

Android 文字倾斜