Android自定义TextView实现文字倾斜效果

public class LeanTextView extends TextView {
  public int getmDegrees() {
    return mDegrees;
  }

  public void setmDegrees(int mDegrees) {
    this.mDegrees = mDegrees;
    invalidate();
  }

  private int mDegrees;

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

  public LeanTextView(Context context, AttributeSet attrs) {
    super(context, attrs, android.R.attr.textViewStyle);
    this.setGravity(Gravity.CENTER);
    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LeanTextView);
    mDegrees = a.getDimensionPixelSize(R.styleable.LeanTextView_degree, 0);
    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();
  }
}

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

  <com.aikaifa.LeanTextView
    android:id="@+id/lean"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:text="爱开发" />

  <com.aikaifa.LeanTextView
    android:id="@+id/lean"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:text="爱开发" />

  <TextView
    android:id="@+id/degrees"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:gravity="center"/>

  <SeekBar
    android:id="@+id/sb_lean"
    android:layout_width="match_parent"
    android:layout_marginTop="20dp"
    android:layout_height="wrap_content"
    android:max="100"
    android:progress="30" />

    mText= (LeanTextView) findViewById (R.id.lean);
    degrees= (TextView) findViewById (R.id.degrees);
    SeekBar sbLean = (SeekBar) findViewById(R.id.sb_lean);
    sbLean.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      @Override
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        mText.setmDegrees(progress);
        degrees.setText("倾斜度："+progress);
      }

      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {

      }

      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {

      }
    });