Android：如何以編程方式設置佈局的大小

Question

作爲Android應用程序的一部分，我構建了一個按鈕集。這些按鈕是LinearLayouts嵌套集的一部分。使用權重我已經根據包含的父LinearLayout的大小自動調整大小。這個想法是基於屏幕的像素數量和密度，將包含的佈局的大小設置爲多個像素;並讓按鈕設置根據該更改自行調整大小。

接下來的問題是：如何調整佈局大小。

我嘗試了幾種建議的技術，沒有接近工作。下面是建立按鈕組中XML的一個子集：

<LinearLayout android:layout_height="104pt" android:id="@+id/numberPadLayout" android:orientation="horizontal" android:layout_width="104pt" 
    android:background="#a0a0a0" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
> 

    <LinearLayout android:layout_weight="2" android:layout_height="fill_parent" android:id="@+id/linearLayout1" android:orientation="vertical" android:layout_width="wrap_content"> 
     <Button android:text="1" android:id="@+id/button1" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="4" android:id="@+id/button4" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="7" android:id="@+id/button7" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="-" android:id="@+id/buttonDash" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
    </LinearLayout> 
    <LinearLayout android:layout_weight="2" android:layout_height="fill_parent" android:id="@+id/linearLayout2" android:orientation="vertical" android:layout_width="wrap_content"> 
     <Button android:text="2" android:id="@+id/button2" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="5" android:id="@+id/button5" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="8" android:id="@+id/button8" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="0" android:id="@+id/button0" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
    </LinearLayout> 

    <LinearLayout android:layout_weight="2" android:layout_height="fill_parent" android:id="@+id/linearLayout3" android:orientation="vertical" android:layout_width="wrap_content"> 
     <Button android:text="3" android:id="@+id/button3" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="6" android:id="@+id/button6" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="9" android:id="@+id/button9" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="." android:id="@+id/buttonDot" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
    </LinearLayout> 
    <LinearLayout android:layout_weight="2" android:layout_height="fill_parent" android:id="@+id/linearLayout4" android:orientation="vertical" android:layout_width="wrap_content"> 
     <Button android:text="/" android:id="@+id/buttonBack" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
     <Button android:text="\" android:id="@+id/buttonEnter" android:layout_weight="2" android:layout_width="fill_parent" android:layout_height="wrap_content"></Button> 
    </LinearLayout> 

</LinearLayout>  

的兩個問題是：1）我如何才能從Java訪問numberPadLayout。一旦我有權訪問視圖，2）如何更改佈局的高度和寬度。

任何建議，將不勝感激。

Answer 1

這應該工作：

// Gets linearlayout 
LinearLayout layout = findViewById(R.id.numberPadLayout); 
// Gets the layout params that will allow you to resize the layout 
LayoutParams params = layout.getLayoutParams(); 
// Changes the height and width to the specified *pixels* 
params.height = 100; 
params.width = 100; 
layout.setLayoutParams(params); 

如果你想浸轉換爲像素，使用此：

int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, <HEIGHT>, getResources().getDisplayMetrics()); 

Answer 2

我的示例代碼

wv = (WebView) findViewById(R.id.mywebview); 
wv.getLayoutParams().height = LayoutParams.MATCH_PARENT; // LayoutParams: android.view.ViewGroup.LayoutParams 
// wv.getLayoutParams().height = LayoutParams.WRAP_CONTENT; 
wv.requestLayout();//It is necesary to refresh the screen 

Answer 3

你可以得到的實際高度用此代碼調用佈局：

public int getLayoutSize() { 
// Get the layout id 
    final LinearLayout root = (LinearLayout) findViewById(R.id.mainroot); 
    final AtomicInteger layoutHeight = new AtomicInteger(); 

    root.post(new Runnable() { 
    public void run() { 
     Rect rect = new Rect(); 
     Window win = getWindow(); // Get the Window 
       win.getDecorView().getWindowVisibleDisplayFrame(rect); 

       // Get the height of Status Bar 
       int statusBarHeight = rect.top; 

       // Get the height occupied by the decoration contents 
       int contentViewTop = win.findViewById(Window.ID_ANDROID_CONTENT).getTop(); 

       // Calculate titleBarHeight by deducting statusBarHeight from contentViewTop 
       int titleBarHeight = contentViewTop - statusBarHeight; 
       Log.i("MY", "titleHeight = " + titleBarHeight + " statusHeight = " + statusBarHeight + " contentViewTop = " + contentViewTop); 

       // By now we got the height of titleBar & statusBar 
       // Now lets get the screen size 
       DisplayMetrics metrics = new DisplayMetrics(); 
       getWindowManager().getDefaultDisplay().getMetrics(metrics); 
       int screenHeight = metrics.heightPixels; 
       int screenWidth = metrics.widthPixels; 
       Log.i("MY", "Actual Screen Height = " + screenHeight + " Width = " + screenWidth); 

       // Now calculate the height that our layout can be set 
       // If you know that your application doesn't have statusBar added, then don't add here also. Same applies to application bar also 
       layoutHeight.set(screenHeight - (titleBarHeight + statusBarHeight)); 
       Log.i("MY", "Layout Height = " + layoutHeight); 

      // Lastly, set the height of the layout  
      FrameLayout.LayoutParams rootParams = (FrameLayout.LayoutParams)root.getLayoutParams(); 
      rootParams.height = layoutHeight.get(); 
      root.setLayoutParams(rootParams); 
     } 
    }); 

return layoutHeight.get(); 
} 

Answer 4

LinearLayout YOUR_LinearLayout =(LinearLayout)findViewById(R.id.YOUR_LinearLayout) 
    LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
         /*width*/ ViewGroup.LayoutParams.MATCH_PARENT, 
       /*height*/ 100, 
       /*weight*/ 1.0f 
       ); 
       YOUR_LinearLayout.setLayoutParams(param);