Android：如何以编程方式设置布局的大小

作为Android应用程序的一部分，我正在构build一个button组。 这些button是LinearLayouts的嵌套集的一部分。 使用权重我有自动根据包含的父LinearLayout的大小自动resize。 这个想法是基于屏幕的像素数量和密度来将包含的布局的大小设置为多个像素; 并让button设置根据更改自己resize。

那么问题是：如何调整布局的大小。

我已经尝试了几个build议的技术，没有接近工作。 以下是构buildbutton集的XML的一个子集：

<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> 

这两个问题是：1）如何从Java访问numberPadLayout。 而且一旦我有权访问该视图，2）如何更改布局的高度和宽度。

任何build议将不胜感激。

Answer 1

这应该工作：

 // 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); 

如果您想将倾angular转换为像素，请使用以下命令：

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

Answer 2

我的示例代码

 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

你可以用下面的代码得到被调用布局的实际高度：

 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(); }