在水平LinearLayout中填充垂直線性佈局返回寬度和高度0

Question

我試圖在一個定製水平LinearLayout中對5個垂直LinearLayout充氣。

首先，我使用LayoutInflater將xml轉換爲View。然後我將垂直佈局添加到水平佈局。

的問題是，在onMeasure，我嘗試設置寬度和孩子的垂直LinearLayout的高度，但是，當我問getWidth和getHeight它總是返回0。

我真的不明白這種行爲。

你能幫我嗎。非常感謝。

垂直的LinearLayout的XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:background="#000000" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:text="Button" 
     android:layout_weight="1" /> 

    <com.vuric.nativesampler.customviews.BandSeekBar 
     android:id="@+id/bandSeek" 
     android:layout_width="wrap_content" 
     android:layout_height="0dp" 
     android:layout_weight="8" 
     android:layout_gravity="center"/> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:text="Button" /> 

</LinearLayout> 

類容器水平的LinearLayout的：

public class EqualizerCustomLayout extends LinearLayout { 

    private static final int MARGIN = 4; 
    private Context context; 

    public EqualizerCustomLayout(Context context) { 
     super(context); 
     this.context = context; 
     init(); 
    } 

    public EqualizerCustomLayout(Context context, AttributeSet attrs, 
      int defStyleAttr) { 
     super(context, attrs, defStyleAttr); 
     this.context = context; 
     init(); 
    } 

    public EqualizerCustomLayout(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     this.context = context; 
     init(); 
    } 

    private void init() { 

     setOrientation(LinearLayout.HORIZONTAL); 
     setLayoutParams(new LinearLayout.LayoutParams(
       LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); 

     //getNumberOfBands is 5 
     for (int i = 0; i < CustomApplicationClass.get().getNumberOfBands(); ++i) { 

      LinearLayout linearLayout = (LinearLayout) inflate(context, 
        R.layout.slot_band_layout, null); 

      addView(linearLayout); 
     } 
    } 

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 

     Log.v("jajaja", "onMeasure children are " + getChildCount()); 

     int width = (CustomApplicationClass.get().getScreenSize().x/100 * 45) 
       + MARGIN * 2; 
     int height = (CustomApplicationClass.get().getScreenSize().x/100 * 45) 
       + MARGIN * 2; 

     LayoutParams params = new LinearLayout.LayoutParams(width/5, width); 

     for (int i = 0; i < getChildCount(); ++i) { 

      LinearLayout layout = (LinearLayout) getChildAt(i); 
      layout.setLayoutParams(new LinearLayout.LayoutParams(width 
        /getChildCount(), height)); 

      Log.v("jajaja", 
        "view" + i + " , w: " + layout.getWidth() + " , h: " 
          + layout.getHeight()); // always return 0 for both width and height 
     } 

     setMeasuredDimension(width, height); 
    } 
} 

Answer 1

你必須等待，直到觀點實際上是繪製。有一種解決方法，可以找到here。