Android，更改下劃線從EditText動態顏色

Question

是否可以動態更改EditText的下劃線顏色？ 就像效果一樣，當我集中它時，它變成了藍色。

希望你明白我想要做什麼。

Answer 1

創建你自己定製的EditText控制

下面是我爲你做一個例子：

選擇時，你探微必須改變mPaint.setColor（Color.GREEN）;另一種顏色

public class CustomEditText extends EditText{ 


private Rect mRect; 
private Paint mPaint; 
int widthMsSize; 
int heightMsSize ; 
// we need this constructor for LayoutInflater 
public CustomEditText(Context context, AttributeSet attrs) { 
    super(context, attrs); 


    mPaint = new Paint(); 
    mPaint.setStyle(Paint.Style.STROKE); 
    mPaint.setStrokeWidth(5); 
    mPaint.setColor(Color.GREEN); 

    System.out.println("constructor"); 
} 

protected void onMeasure(final int widthMeasureSpec, 
     final int heightMeasureSpec) { 
    // Extract the Ms (MesaureSpec) parameters 

    widthMsSize = MeasureSpec.getSize(widthMeasureSpec); 

    heightMsSize = MeasureSpec.getSize(heightMeasureSpec); 

    System.out.println("on measure"); 
    // Satisfy contract by calling setMeasuredDimension 
    setMeasuredDimension(widthMsSize, 
      heightMsSize); 



} 

protected void onDraw(Canvas canvas) { 

    canvas.drawLine(5, heightMsSize-10, widthMsSize-5, heightMsSize-10, mPaint); //draw underline 

    canvas.drawLine(8, heightMsSize-10,8, heightMsSize-20, mPaint); //draw left corner 

    canvas.drawLine(widthMsSize-8, heightMsSize-10,widthMsSize-8, heightMsSize-20, mPaint); //draw right corner 

    super.onDraw(canvas); 
} 

}

main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <com.example.testanimationfadeinfadeout.CustomEditText 
     android:id="@+id/textedit" 
     android:layout_width="228dp" 
     android:layout_height="41dp" 
     android:ems="10" 
     android:hint="color is changed" /> 

</LinearLayout> 

Answer 2

要自定義編輯文本我做了以下的方法。它對我來說非常簡單。

public class CardNumberText extends EditText { 

    boolean isFocus; 
    Paint mPaint; 
    Rect mRect; 
    int widthSize, heightSize; 

    public CardNumberText(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 

     initStyle(); 

    } 

    private void initStyle() { 
     mRect = new Rect(); 
     mPaint = new Paint(); 
     mPaint.setStyle(Paint.Style.STROKE); 
     mPaint.setColor(Color.parseColor("#B3B3B3")); 
    } 

    public CardNumberText(Context context, AttributeSet attrs) { 
     super(context, attrs); 

     initStyle(); 
    } 

    public CardNumberText(Context context) { 
     super(context); 

     initStyle(); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     Rect rect = mRect; 
     Paint paint = mPaint; 
     if (isFocus) { 
      mPaint.setStrokeWidth(3.0f); 
      mPaint.setColor(Color.parseColor("#80CBC4")); 
     } else { 
      mPaint.setStrokeWidth(1.5f); 
      mPaint.setColor(Color.parseColor("#B3B3B3")); 
     } 
     for (int i = 0; i < getLineCount(); i++) { 
      int baseline = getLineBounds(i, rect); 
      canvas.drawLine(rect.left, baseline + 20, rect.right, baseline, 
        paint); 
     } 

    } 

    @Override 
    protected void onFocusChanged(boolean focused, int direction, 
      Rect previouslyFocusedRect) { 
     super.onFocusChanged(focused, direction, previouslyFocusedRect); 
     if (focused) { 
      isFocus = true; 
     } else { 
      isFocus = false; 
     } 
    } 
} 

Answer 3

public static void setEditTextUnderlineColor(final EditText editText, final int focusedColor, final int unfocusedColor) { 
    editText.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if (hasFocus) { 
       editText.getBackground().setColorFilter(focusedColor, PorterDuff.Mode.SRC_ATOP); 
       return; 
      } 
      editText.getBackground().setColorFilter(unfocusedColor, PorterDuff.Mode.SRC_ATOP); 
     } 
    }); 

    editText.getBackground().setColorFilter(unfocusedColor, PorterDuff.Mode.SRC_ATOP);