自定義textview

package com.paad.todolist;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;

public class ToDoListItemView extends TextView {
  
  private Paint marginPaint;
  private Paint linePaint;
  private int paperColor;
  private float margin;


  public ToDoListItemView (Context context, AttributeSet ats, int ds) {
    super(context, ats, ds);
    init();
  }

  public ToDoListItemView (Context context) {
    super(context);
    init();
  }

  public ToDoListItemView (Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  private void init() {
    // Get a reference to our resource table.
    Resources myResources = getResources();

    // Create the paint brushes we will use in the onDraw method.
    marginPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    marginPaint.setColor(myResources.getColor(R.color.notepad_margin));
    linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    linePaint.setColor(myResources.getColor(R.color.notepad_lines));

    // Get the paper background color and the margin width.
    paperColor = myResources.getColor(R.color.notepad_paper);
    margin = myResources.getDimension(R.dimen.notepad_margin);
  }

  @Override
  public void onDraw(Canvas canvas) {
    // Color as paper
    canvas.drawColor(paperColor);

    // Draw ruled lines
    canvas.drawLine(0, 0, 0, getMeasuredHeight(), linePaint);
    canvas.drawLine(0, getMeasuredHeight(),
                       getMeasuredWidth(), getMeasuredHeight(),
                       linePaint);

    // Draw margin
    canvas.drawLine(margin, 0, margin, getMeasuredHeight(), marginPaint);

    // Move the text across from the margin
    canvas.save();
    canvas.translate(margin, 0);//圖像統一往左移動

    // Use the TextView to render the text
    super.onDraw(canvas);
    canvas.restore();
  }

}