如何在android relativelayout周圍放置邊框？

Question

我已經看到這個subject圍繞android textview放置一個邊框，我用它。但是現在，我想將邊框放置在相對佈局的小部件周圍。我該怎麼做？

Answer 1

創建一個FrameLayout，獲取邊框的背景顏色以及邊框寬度的邊距或邊距，然後將該FrameLayout放置在您的RelativeLayout中。將TextView放在FrameLayout中，而不是直接放在RelativeLayout中。 poof即時邊框。

Answer 2

RelativeLayout layout = (RelativeLayout) view.findViewById(R.id.borderEffect); // id fetch from xml 
ShapeDrawable rectShapeDrawable = new ShapeDrawable(); // pre defined class 

// get paint 
Paint paint = rectShapeDrawable.getPaint(); 

// set border color, stroke and stroke width 
paint.setColor(Color.GRAY); 
paint.setStyle(Style.STROKE); 
paint.setStrokeWidth(5); // you can change the value of 5 
layout.setBackgroundDrawable(rectShapeDrawable); 

Answer 3

在 res/drawable文件夾
1. ，創建一個新的文件background_border.xml

在這個文件中，你將定義背景部件是這樣的：

<shape xmlns:android="http://schemas.android.com/apk/res/android" 
     android:shape="rectangle" > 
    <!-- This is the stroke you want to define --> 
    <stroke android:width="1dp" 
      android:color="@color/color_stroke"/> 

    <!-- Optional, round your corners --> 
    <corners android:bottomLeftRadius="0dp" 
      android:topLeftRadius="5dp" 
      android:bottomRightRadius="5dp" 
      android:topRightRadius="0dp" /> 

    <!-- Optional, fill the rest of your background with a color or gradient, use transparent if you only want the border to be displayed--> 
    <gradient android:startColor="@android:color/transparent" 
       android:endColor="@android:color/transparent" 
       android:angle="90"/> 
</shape> 

將您小部件的背景設置爲您剛剛創建的可繪製配置

例如。如果你想要把你的邊界上的RelativeLayout：

<RelativeLayout    
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@drawable/background_border" 
      android:padding="15dp"> 
    ... 
</RelativeLayout> 

Answer 4

雖然所提供的所有答案的工作，他們都非常rigid.what如果您要自定義邊框顏色，爲了borderThickness不同的屏幕。爲此，您應該嘗試我的解決方案。我們將按照創建自定義RelativeLayout的三個步驟，允許您爲底部邊框提供borderColor和Thickness。

1）創建擴展的RelativeLayout一類並覆蓋上Draw方法

public class BorderRelativeLayout extends RelativeLayout { 

    private float borderThickness; 
    private int borderColor; 

    public BorderRelativeLayout(Context context) { 
    this(context, null, 0); 
    } 

    public BorderRelativeLayout(Context context, AttributeSet attrs) { 
    this(context, attrs, 0); 
    } 

    public BorderRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
    init(context, attrs); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 

    Rect rect = new Rect(); 
    Paint paint = new Paint(); 
    paint.setColor(borderColor); 
    paint.setStrokeWidth(borderThickness); 
    getLocalVisibleRect(rect); 
    canvas.drawLine(rect.left, rect.bottom, rect.right, rect.bottom, paint); 
    } 

    private void init(Context context, AttributeSet attrs) { 
    setWillNotDraw(false); 

    TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.BorderRelativeLayout); 

    borderThickness = array.getDimension(R.styleable.BorderRelativeLayout_borderThickness, 0.5f); 
    borderColor = array.getColor(R.styleable.BorderRelativeLayout_borderColor, 
     ContextCompat.getColor(context, R.color.colorPrimary)); 
    } 
} 

2）在attrs.xml定義風格化性質

<declare-styleable name="BorderRelativeLayout"> 
    <attr name="borderThickness" format="dimension"/> 
    <attr name="borderColor" format="color"/> 
    </declare-styleable> 

3）完成後，你可以使用它像

<com.spacewek.spacewek.controls.BorderRelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/headLayout" 
     app:borderThickness="2dp" 
     app:borderColor="@color/divider_new_color"> 

</com.spacewek.spacewek.controls.BorderRelativeLayout>