Android:如何以编程方式设置布局的大小 [英] Android: How to Programmatically set the size of a Layout

问题描述

作为 Android 应用程序的一部分，我正在构建一个按钮集.这些按钮是一组嵌套的 LinearLayouts 的一部分.使用权重，我可以根据包含父 LinearLayout 的大小自动调整自身的大小.这个想法是，根据屏幕的像素数和密度，将包含布局的大小设置为多个像素；并让按钮设置根据该更改自行调整大小.

As part of an Android App I am building a button set. The buttons are part of a nested set of LinearLayouts. Using weight I have the set resizing itself automatically based on the size of the containing parent LinearLayout. The idea is, based on the pixel count and density of the screen, to set the size of the containing layout to a number of pixels; and have the button set resize itself based on that change.

接下来的问题是:如何调整布局的大小.

The question then is: How to resize the layout.

我尝试了几种建议的技术，但没有一个接近工作.这是构建按钮集的 XML 子集:

I have tried several suggested techniques, and none come close to working. Here is a subset of the XML that builds the button set:

    <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>    

两个问题是:1) 我如何从 Java 访问 numberPadLayout.一旦我可以访问视图，2) 如何更改布局的高度和宽度.

The two questions are: 1) how do I get access to numberPadLayout from Java. And once I have access to the view, 2) how do I change the height and width of the layout.

任何建议将不胜感激.

推荐答案

Java

这应该有效:

// 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);

如果要将倾角转换为像素，请使用:

If you want to convert dip to pixels, use this:

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

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