Android-使用按钮填充布局

Question

Just a quick question about how you would go about implementing this. I want there to be buttons at the bottom of the screen, but if the screen size is larger, more buttons would be added.

For example, at a small screen size, there might be 4-5 buttons at the bottom, but if you ran it on a tablet or something similar, there would be maybe 20 buttons.

Any suggestions? It can't scroll either, it just has to dynamically fill the layout with buttons.

Thanks.

Answer 1

To put buttons at the bottom of a layout, do something like this to your layout:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_layout">
    <LinearLayout
        android:layout_height="wrap_content"
        android:id="@+id/button_layout"
        android:layout_alignParentBottom="true"
        android:layout_width="fill_parent"
        android:gravity="center">
        <Button
            android:id="@+id/Button01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 1"></Button>
        <Button
            android:id="@+id/Button02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 2"></Button>
        <Button
            android:id="@+id/Button03"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 3"></Button>
    </LinearLayout>
    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/button_layout"
        android:id="@+id/content">
        <ListView
            android:id="@+id/ListView01"
            android:layout_height="fill_parent"
            android:layout_width="fill_parent"></ListView>
    </FrameLayout>
</RelativeLayout>

To change how many buttons are shown based on the screen size, you should implement separate layouts for Multiple Screen Sizes..

http://developer.android.com/guide/practices/screens_support.html

Answer 2

Sounds like you want to create your own custom layout class. That or just fill a LinearLayout (for instance) until you run out of screen space.

Answer 3

If you know the size of your buttons in pixels you could use DisplayMetrics to get the dimensions of the screen then calculate how many buttons will fit in your allotted space.

     DisplayMetrics metrics = new DisplayMetrics();
     getWindowManager().getDefaultDisplay().getMetrics(metrics);

metrics.heightPixels givs absolute height in pixels metrics.ydpi gives exact physical pixels per inch of the screen

and metrics.density gives logical density for scaling purposes

see here: http://developer.android.com/reference/android/util/DisplayMetrics.html

then just do something like

do{
    Button button=new Button(context);
    button.setText("yada yada")
    button.allYoursettings....
    .
    .
    LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    LinearLayout layout=(LinearLayout) findViewById(R.id.yourlayout);
    layout.addView(button,p);
} while(havespaceleft);