问题
Android defines screen sizes as Normal Large XLarge etc.
It automatically picks between static resources in appropriate folders. I need this data about the current device in my java code. The DisplayMetrics only gives information about the current device density. Nothing is available regarding screen size.
I did find the ScreenSize enum in grep code here However this does not seem available to me for 4.0 SDK. Is there a way to get this information?
回答1:
Copy and paste this code into your Activity and when it is executed it will Toast the device's screen size category.
int screenSize = getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK;
String toastMsg;
switch(screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
toastMsg = "Large screen";
break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
toastMsg = "Normal screen";
break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
toastMsg = "Small screen";
break;
default:
toastMsg = "Screen size is neither large, normal or small";
}
Toast.makeText(this, toastMsg, Toast.LENGTH_LONG).show();
回答2:
private static String getScreenResolution(Context context)
{
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
int width = metrics.widthPixels;
int height = metrics.heightPixels;
return "{" + width + "," + height + "}";
}
回答3:
Determine Screen Size :
int screenSize = getResources().getConfiguration().screenLayout &Configuration.SCREENLAYOUT_SIZE_MASK;
switch(screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();
break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
Toast.makeText(this, "Normal screen",Toast.LENGTH_LONG).show();
break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
Toast.makeText(this, "Small screen",Toast.LENGTH_LONG).show();
break;
default:
Toast.makeText(this, "Screen size is neither large, normal or small" , Toast.LENGTH_LONG).show();
}
Determine density:
int density= getResources().getDisplayMetrics().densityDpi;
switch(density)
{
case DisplayMetrics.DENSITY_LOW:
Toast.makeText(context, "LDPI", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_MEDIUM:
Toast.makeText(context, "MDPI", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_HIGH:
Toast.makeText(context, "HDPI", Toast.LENGTH_SHORT).show();
break;
case DisplayMetrics.DENSITY_XHIGH:
Toast.makeText(context, "XHDPI", Toast.LENGTH_SHORT).show();
break;
}
for Ref: http://devl-android.blogspot.in/2013/10/wifi-connectivity-and-hotspot-in-android.html
回答4:
You can get display size in pixels using this code.
Display display = getWindowManager().getDefaultDisplay();
SizeUtils.SCREEN_WIDTH = display.getWidth();
SizeUtils.SCREEN_HEIGHT = display.getHeight();
回答5:
You can try this , It is working Example
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int ht = displaymetrics.heightPixels;
int wt = displaymetrics.widthPixels;
if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show();}
else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
Toast.makeText(this, "Normal sized screen", Toast.LENGTH_LONG)
.show();
} else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
Toast.makeText(this, "Small sized screen", Toast.LENGTH_LONG)
.show();
} else {
Toast.makeText(this,
"Screen size is neither large, normal or small",
Toast.LENGTH_LONG).show();
}
// Determine density
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int density = metrics.densityDpi;
if (density == DisplayMetrics.DENSITY_HIGH) {
Toast.makeText(this,
"DENSITY_HIGH... Density is " + String.valueOf(density),
Toast.LENGTH_LONG).show();
} else if (density == DisplayMetrics.DENSITY_MEDIUM) {
Toast.makeText(this,
"DENSITY_MEDIUM... Density is " + String.valueOf(density),
Toast.LENGTH_LONG).show();
} else if (density == DisplayMetrics.DENSITY_LOW) {
Toast.makeText(this,
"DENSITY_LOW... Density is " + String.valueOf(density),
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(
this,
"Density is neither HIGH, MEDIUM OR LOW. Density is "
+ String.valueOf(density), Toast.LENGTH_LONG)
.show();
}
// These are deprecated
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
回答6:
I think it is a pretty straight forward simple piece of code!
public Map<String, Integer> deriveMetrics(Activity activity) {
try {
DisplayMetrics metrics = new DisplayMetrics();
if (activity != null) {
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
}
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("screenWidth", Integer.valueOf(metrics.widthPixels));
map.put("screenHeight", Integer.valueOf(metrics.heightPixels));
map.put("screenDensity", Integer.valueOf(metrics.densityDpi));
return map;
} catch (Exception err) {
; // just use zero values
return null;
}
}
This method now can be used anywhere independently. Wherever you want to get information about device screen do it as follows:
Map<String, Integer> map = deriveMetrics2(this);
map.get("screenWidth");
map.get("screenHeight");
map.get("screenDensity");
Hope this might be helpful to someone out there and may find it easier to use. If I need to re-correct or improve please don't hesitate to let me know! :-)
Cheers!!!
回答7:
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
回答8:
simon-
Different screen sizes have different pixel densities. A 4 inch display on your phone could have more or less pixels then say a 26 inch TV. If Im understanding correctly he wants to detect which of the size groups the current screen is, small, normal, large, and extra large. The only thing I can think of is to detect the pixel density and use that to determine the actual size of the screen.
回答9:
I need this for a couple of my apps and the following code was my solution to the problem. Just showing the code inside onCreate. This is a stand alone app to run on any device to return the screen info.
setContentView(R.layout.activity_main);
txSize = (TextView) findViewById(R.id.tvSize);
density = (TextView) findViewById(R.id.density);
densityDpi = (TextView) findViewById(R.id.densityDpi);
widthPixels = (TextView) findViewById(R.id.widthPixels);
xdpi = (TextView) findViewById(R.id.xdpi);
ydpi = (TextView) findViewById(R.id.ydpi);
Configuration config = getResources().getConfiguration();
if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show();
txSize.setText("Large screen");
} else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
Toast.makeText(this, "Normal sized screen", Toast.LENGTH_LONG)
.show();
txSize.setText("Normal sized screen");
} else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
Toast.makeText(this, "Small sized screen", Toast.LENGTH_LONG)
.show();
txSize.setText("Small sized screen");
} else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
Toast.makeText(this, "xLarge sized screen", Toast.LENGTH_LONG)
.show();
txSize.setText("Small sized screen");
} else {
Toast.makeText(this,
"Screen size is neither large, normal or small",
Toast.LENGTH_LONG).show();
txSize.setText("Screen size is neither large, normal or small");
}
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
Log.i(TAG, "density :" + metrics.density);
density.setText("density :" + metrics.density);
Log.i(TAG, "D density :" + metrics.densityDpi);
densityDpi.setText("densityDpi :" + metrics.densityDpi);
Log.i(TAG, "width pix :" + metrics.widthPixels);
widthPixels.setText("widthPixels :" + metrics.widthPixels);
Log.i(TAG, "xdpi :" + metrics.xdpi);
xdpi.setText("xdpi :" + metrics.xdpi);
Log.i(TAG, "ydpi :" + metrics.ydpi);
ydpi.setText("ydpi :" + metrics.ydpi);
And a simple XML file
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:id="@+id/tvSize"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/density"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/densityDpi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/widthPixels"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/xdpi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/ydpi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
回答10:
If you are in a non-activity i.e. Fragment, Adapter, Model class or any other java class that do not extends Activity simply getResources() will not work. You can use getActivity() in fragment or use context that you pass to the corresponding class.
mContext.getResources()
I would recommend making a class say Utils that will have method/Methods for the common work. The benefit for this is you can get desired result with single line of code anywhere in the app calling this method.
回答11:
The algorithm below can be used to identify which category will be used for picking between the static resources and also caters for the newer XX and XXX high densities
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
mDensityDpi = displayMetrics.densityDpi;
mDensity = displayMetrics.density;
mDisplayWidth = displayMetrics.widthPixels;
mDisplayHeight = displayMetrics.heightPixels;
String densityStr = "Unknown";
int difference, leastDifference = 9999;
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_LOW);
if (difference < leastDifference) {
leastDifference = difference;
densityStr = "LOW";
}
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_MEDIUM);
if (difference < leastDifference) {
leastDifference = difference;
densityStr = "MEDIUM";
}
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_HIGH);
if (difference < leastDifference) {
leastDifference = difference;
densityStr = "HIGH";
}
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_XHIGH);
if (difference < leastDifference) {
leastDifference = difference;
densityStr = "XHIGH";
}
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_XXHIGH);
if (difference < leastDifference) {
leastDifference = difference;
densityStr = "XXHIGH";
}
difference = Math.abs(mDensityDpi - DisplayMetrics.DENSITY_XXXHIGH);
if (difference < leastDifference) {
densityStr = "XXXHIGH";
}
Log.i(TAG, String.format("Display [h,w]: [%s,%s] Density: %s Density DPI: %s [%s]", mDisplayHeight, mDisplayWidth, mDensity, mDensityDpi, densityStr));
来源：https://stackoverflow.com/questions/11252067/how-do-i-get-the-screensize-programmatically-in-android