Android - edittext - underline

Question

有沒有辦法讓多行edittext中的所有行加下劃線？ 我希望所有行都能顯示行，即使沒有文字。

Answer 1

這種事情在Notepad示例演示中完成。如果我們看一下editor source，我們可以看到他們使用定製的文本編輯器，像這樣：

/** 
* A custom EditText that draws lines between each line of text that is displayed. 
*/ 
public static class LinedEditText extends EditText { 
    private Rect mRect; 
    private Paint mPaint; 

    // we need this constructor for LayoutInflater 
    public LinedEditText(Context context, AttributeSet attrs) { 
     super(context, attrs); 

     mRect = new Rect(); 
     mPaint = new Paint(); 
     mPaint.setStyle(Paint.Style.STROKE); 
     mPaint.setColor(0x800000FF); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     int count = getLineCount(); 
     Rect r = mRect; 
     Paint paint = mPaint; 

     for (int i = 0; i < count; i++) { 
      int baseline = getLineBounds(i, r); 

      canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint); 
     } 

     super.onDraw(canvas); 
    } 
} 

，他們隨後在layout聲明是這樣的：

<view xmlns:android="http://schemas.android.com/apk/res/android" 
    class="com.example.android.notepad.NoteEditor$LinedEditText" 
    android:id="@+id/note" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@android:color/transparent" 
    android:padding="5dp" 
    android:scrollbars="vertical" 
    android:fadingEdge="vertical" 
    android:gravity="top" 
    android:textSize="22sp" 
    android:capitalize="sentences" />