一个应用程序如何处理屏幕分辨率和屏幕尺寸

Question

I have been trying to figure this out but I really dont get it.. If I want to create one app with one layout thats supposed to fit all android devices (by scaling).. how can I achive this?.. For instance.. I might have an editText thats 300dp, that will look great on my Samsung Galaxy S2.. but if I run the same app at my nexus 10, it will look very small, and I whould then like the editText to scale up on both width and height to fit my nexus 10.. is there any simple way to achive this?

I noticed that there is something called weight.. but if i created three editTexts where the first one had a weight of 10,the 2:nd a weight of 20 and then 3:rd a weight of 80, the last one never showed up...

Anyway.. how do you handle this stuff by best practice?

Answer 1

Generally this situation can be handled by adding

<supports-screens android:normalScreens="true"
    android:smallScreens="true" android:largeScreens="true"
    android:anyDensity="true" android:resizeable="true" />

in the androidmanifest.xml

Answer 2

Use the xhdpi resources and try to set all the layouts at the runtime using the layout params according to the device.

or let the android decide what is best for the device create following folders

1. layout-large
2. layout-small
3. layout-sw600
4. layout-sw720

and similar folders to organize your layouts better

Answer 3

This document would be great help

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

If you your layout to look good on both phone and tablet, you will need to have separate layout files, one in layout and another in layout-xlarge (for the 10" tablet), put in different size for the edittext.

Another approach is to keep a single layout file but extract all the size related value to separate xml files. Put them in values and values-xlarge folders respectively.

Answer 4

Here is how I do it,

Create a function that you can call that returns device width dependent size. The "32" is arbitrary which gives you a relative font size proportional to the screen.

textView.setTextSize(getFontSize(activity));


public static int getFontSize (Activity activity) { 

    DisplayMetrics dMetrics = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(dMetrics);

    // lets try to get them back a font size realtive to the pixel width of the screen
    final float WIDE = activity.getResources().getDisplayMetrics().widthPixels;
    int valueWide = (int)(WIDE / 32.0f / (dMetrics.scaledDensity));
    return valueWide;
}