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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.dpi.cts;
     18 
     19 import android.content.Context;
     20 import android.content.pm.PackageManager;
     21 import android.test.AndroidTestCase;
     22 import android.util.DisplayMetrics;
     23 import android.view.Display;
     24 import android.view.WindowManager;
     25 
     26 import java.util.HashSet;
     27 import java.util.Set;
     28 
     29 /**
     30  * Test for verifying a device's screen configuration.
     31  */
     32 public class ConfigurationTest extends AndroidTestCase {
     33 
     34     public void testScreenConfiguration() {
     35         WindowManager windowManager =
     36                 (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
     37         Display display = windowManager.getDefaultDisplay();
     38         DisplayMetrics metrics = new DisplayMetrics();
     39         display.getMetrics(metrics);
     40 
     41         double xInches = (double) metrics.widthPixels / metrics.xdpi;
     42         double yInches = (double) metrics.heightPixels / metrics.ydpi;
     43         double diagonalInches = Math.sqrt(Math.pow(xInches, 2) + Math.pow(yInches, 2));
     44         double minSize = 2.5d;
     45         if (getContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_WATCH)) {
     46             // Watches have a different minimum diagonal.
     47             minSize = 1.0d;
     48         }
     49         assertTrue("Screen diagonal must be at least " + minSize + " inches: " + diagonalInches,
     50                 diagonalInches >= minSize);
     51 
     52         double density = 160.0d * metrics.density;
     53         assertTrue("Screen density must be at least 100 dpi: " + density, density >= 100.0d);
     54 
     55         Set<Integer> allowedDensities = new HashSet<Integer>();
     56         allowedDensities.add(DisplayMetrics.DENSITY_LOW);
     57         allowedDensities.add(DisplayMetrics.DENSITY_MEDIUM);
     58         allowedDensities.add(DisplayMetrics.DENSITY_TV);
     59         allowedDensities.add(DisplayMetrics.DENSITY_HIGH);
     60         allowedDensities.add(DisplayMetrics.DENSITY_280);
     61         allowedDensities.add(DisplayMetrics.DENSITY_XHIGH);
     62         allowedDensities.add(DisplayMetrics.DENSITY_360);
     63         allowedDensities.add(DisplayMetrics.DENSITY_400);
     64         allowedDensities.add(DisplayMetrics.DENSITY_420);
     65         allowedDensities.add(DisplayMetrics.DENSITY_XXHIGH);
     66         allowedDensities.add(DisplayMetrics.DENSITY_560);
     67         allowedDensities.add(DisplayMetrics.DENSITY_XXXHIGH);
     68         assertTrue("DisplayMetrics#densityDpi must be one of the DisplayMetrics.DENSITY_* values: "
     69                 + allowedDensities, allowedDensities.contains(metrics.densityDpi));
     70 
     71         assertEquals(metrics.density,
     72                 (float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT,
     73                 0.5f / DisplayMetrics.DENSITY_DEFAULT);
     74     }
     75 }
     76