三种方式获得手机屏幕的宽和高

主要代码:

  1 package com.km.screeninfo;
  2 
  3 import android.os.Bundle;
  4 import android.support.v4.app.Fragment;
  5 import android.support.v4.app.FragmentActivity;
  6 import android.util.DisplayMetrics;
  7 import android.view.LayoutInflater;
  8 import android.view.Menu;
  9 import android.view.MenuItem;
 10 import android.view.View;
 11 import android.view.ViewGroup;
 12 import android.widget.TextView;
 13 
 14 public class MainActivity extends FragmentActivity {
 15 
 16     @Override
 17     protected void onCreate(Bundle savedInstanceState) {
 18         super.onCreate(savedInstanceState);
 19         setContentView(R.layout.activity_main);
 20 
 21         if (savedInstanceState == null) {
 22             getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
 23         }
 24     }
 25 
 26     /**
 27      * A placeholder fragment containing a simple view.
 28      */
 29     public static class PlaceholderFragment extends Fragment {
 30 
 31         private TextView tvModel;
 32         private TextView tvScreenHeight1;
 33         private TextView tvScreenHeight2;
 34         private TextView tvScreenHeight3;
 35         private TextView tvScreenWidth1;
 36         private TextView tvScreenWidth2;
 37         private TextView tvScreenWidth3;
 38         private TextView tvScreenDensity2;
 39         private TextView tvScreenDensityDPI2;
 40         private TextView tvScreenDensity3;
 41         private TextView tvScreenDensityDPI3;
 42         private TextView tvScreenWidth4;
 43         private TextView tvScreenHeight4;
 44 
 45         public PlaceholderFragment() {
 46         }
 47 
 48         @Override
 49         public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 50             View rootView = inflater.inflate(R.layout.fragment_main, container, false);
 51             tvModel = (TextView) rootView.findViewById(R.id.tv_model);
 52             tvScreenHeight1 = (TextView) rootView.findViewById(R.id.tv_screen_height1);
 53             tvScreenHeight2 = (TextView) rootView.findViewById(R.id.tv_screen_height2);
 54             tvScreenHeight3 = (TextView) rootView.findViewById(R.id.tv_screen_height3);
 55             tvScreenHeight4 = (TextView) rootView.findViewById(R.id.tv_screen_height4);
 56 
 57             tvScreenWidth1 = (TextView) rootView.findViewById(R.id.tv_screen_width1);
 58             tvScreenWidth2 = (TextView) rootView.findViewById(R.id.tv_screen_width2);
 59             tvScreenWidth3 = (TextView) rootView.findViewById(R.id.tv_screen_width3);
 60             tvScreenWidth4 = (TextView) rootView.findViewById(R.id.tv_screen_width4);
 61 
 62             tvScreenDensity2 = (TextView) rootView.findViewById(R.id.tv_screen_density2);
 63             tvScreenDensityDPI2 = (TextView) rootView.findViewById(R.id.tv_screen_densityDPI2);
 64 
 65             tvScreenDensity3 = (TextView) rootView.findViewById(R.id.tv_screen_density3);
 66             tvScreenDensityDPI3 = (TextView) rootView.findViewById(R.id.tv_screen_densityDPI3);
 67 
 68             tvModel.setText(android.os.Build.MODEL);
 69 
 70             // 获取屏幕密度(方法1)
 71             int screenWidth1 = getActivity().getWindowManager().getDefaultDisplay().getWidth(); // 屏幕宽(像素,如:480px)
 72             int screenHeight1 = getActivity().getWindowManager().getDefaultDisplay().getHeight(); // 屏幕高(像素,如:800p)
 73 
 74             tvScreenHeight1.setText(screenHeight1 + " px");
 75             tvScreenWidth1.setText(screenWidth1 + " px");
 76 
 77             // 获取屏幕密度(方法2)
 78             DisplayMetrics dm2 = getResources().getDisplayMetrics();
 79 
 80             float density = dm2.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0)
 81             int densityDPI = dm2.densityDpi; // 屏幕密度(每寸像素:120/160/240/320)
 82             float xdpi = dm2.xdpi;
 83             float ydpi = dm2.ydpi;
 84 
 85             int screenWidth2 = dm2.widthPixels; // 屏幕宽(像素,如:480px)
 86             int screenHeight2 = dm2.heightPixels; // 屏幕高(像素,如:800px)
 87 
 88             tvScreenHeight2.setText(screenHeight2 + " px");
 89             tvScreenWidth2.setText(screenWidth2 + " px");
 90             tvScreenDensity2.setText(density + "");
 91             tvScreenDensityDPI2.setText(densityDPI + "");
 92 
 93             // 获取屏幕密度(方法3)
 94             DisplayMetrics dm3 = new DisplayMetrics();
 95             getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm3);
 96 
 97             density = dm3.density; // 屏幕密度(像素比例:0.75/1.0/1.5/2.0)
 98             densityDPI = dm3.densityDpi; // 屏幕密度(每寸像素:120/160/240/320)
 99             xdpi = dm3.xdpi;
100             ydpi = dm3.ydpi;
101 
102             tvScreenDensity3.setText(density + "");
103             tvScreenDensityDPI3.setText(densityDPI + "");
104 
105             int screenWidth3 = dm3.widthPixels; // 屏幕宽(px,如:480px)
106             int screenHeight3 = dm3.heightPixels; // 屏幕高(px,如:800px)
107 
108             tvScreenHeight3.setText(screenHeight3 + " px");
109             tvScreenWidth3.setText(screenWidth3 + " px");
110 
111             float screenWidthDip = (dm3.widthPixels / density); // 屏幕宽(dip,如:320dip)
112             float screenHeightDip = (dm3.heightPixels / density); // 屏幕宽(dip,如:533dip)
113 
114             tvScreenHeight4.setText(screenHeightDip + " dip");
115             tvScreenWidth4.setText(screenWidthDip + " dip");
116             return rootView;
117         }
118     }
119 
120 }

activity_main.xml:

1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
2     xmlns:tools="http://schemas.android.com/tools"
3     android:id="@+id/container"
4     android:layout_width="match_parent"
5     android:layout_height="match_parent"
6     tools:context="com.km.screeninfo.MainActivity"
7     tools:ignore="MergeRootFrame" />
  1 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  2     xmlns:tools="http://schemas.android.com/tools"
  3     android:layout_width="wrap_content"
  4     android:layout_height="wrap_content"
  5     tools:context="com.km.screeninfo.MainActivity$PlaceholderFragment" >
  6 
  7     <LinearLayout
  8         android:layout_width="match_parent"
  9         android:layout_height="match_parent"
 10         android:orientation="vertical" >
 11 
 12         <LinearLayout
 13             android:layout_width="match_parent"
 14             android:layout_height="wrap_content"
 15             android:layout_margin="2dip"
 16             android:orientation="horizontal" >
 17 
 18             <TextView
 19                 android:layout_width="wrap_content"
 20                 android:layout_height="wrap_content"
 21                 android:text="手机型号:"
 22                 android:textStyle="bold" />
 23 
 24             <TextView
 25                 android:id="@+id/tv_model"
 26                 android:layout_width="wrap_content"
 27                 android:layout_height="wrap_content" />
 28         </LinearLayout>
 29 
 30         <TextView
 31             android:layout_width="wrap_content"
 32             android:layout_height="wrap_content"
 33             android:layout_marginBottom="3dip"
 34             android:layout_marginTop="3dip"
 35             android:text="方法一:getDefaultDisplay().getH/W()"
 36             android:textColor="#aa66aa"
 37             android:textSize="16sp" />
 38 
 39         <LinearLayout
 40             android:layout_width="match_parent"
 41             android:layout_height="wrap_content"
 42             android:layout_margin="2dip"
 43             android:layout_marginTop="3dip"
 44             android:orientation="horizontal" >
 45 
 46             <TextView
 47                 android:layout_width="wrap_content"
 48                 android:layout_height="wrap_content"
 49                 android:text="屏幕高(一):"
 50                 android:textStyle="bold" />
 51 
 52             <TextView
 53                 android:id="@+id/tv_screen_height1"
 54                 android:layout_width="wrap_content"
 55                 android:layout_height="wrap_content" />
 56         </LinearLayout>
 57 
 58         <LinearLayout
 59             android:layout_width="match_parent"
 60             android:layout_height="wrap_content"
 61             android:layout_margin="2dip"
 62             android:orientation="horizontal" >
 63 
 64             <TextView
 65                 android:layout_width="wrap_content"
 66                 android:layout_height="wrap_content"
 67                 android:text="屏幕宽(一):"
 68                 android:textStyle="bold" />
 69 
 70             <TextView
 71                 android:id="@+id/tv_screen_width1"
 72                 android:layout_width="wrap_content"
 73                 android:layout_height="wrap_content" />
 74         </LinearLayout>
 75 
 76         <TextView
 77             android:layout_width="wrap_content"
 78             android:layout_height="wrap_content"
 79             android:layout_marginBottom="3dip"
 80             android:layout_marginTop="3dip"
 81             android:text="方法二:getResources().getDisplayMetrics().H/W"
 82             android:textColor="#aa66aa"
 83             android:textSize="16sp" />
 84 
 85         <LinearLayout
 86             android:layout_width="match_parent"
 87             android:layout_height="wrap_content"
 88             android:layout_margin="2dip"
 89             android:layout_marginTop="3dip"
 90             android:orientation="horizontal" >
 91 
 92             <TextView
 93                 android:layout_width="wrap_content"
 94                 android:layout_height="wrap_content"
 95                 android:text="屏幕高(二):"
 96                 android:textStyle="bold" />
 97 
 98             <TextView
 99                 android:id="@+id/tv_screen_height2"
100                 android:layout_width="wrap_content"
101                 android:layout_height="wrap_content" />
102         </LinearLayout>
103 
104         <LinearLayout
105             android:layout_width="match_parent"
106             android:layout_height="wrap_content"
107             android:layout_margin="2dip"
108             android:orientation="horizontal" >
109 
110             <TextView
111                 android:layout_width="wrap_content"
112                 android:layout_height="wrap_content"
113                 android:text="屏幕宽(二):"
114                 android:textStyle="bold" />
115 
116             <TextView
117                 android:id="@+id/tv_screen_width2"
118                 android:layout_width="wrap_content"
119                 android:layout_height="wrap_content" />
120         </LinearLayout>
121 
122         <LinearLayout
123             android:layout_width="match_parent"
124             android:layout_height="wrap_content"
125             android:layout_margin="2dip"
126             android:layout_marginTop="3dip"
127             android:orientation="horizontal" >
128 
129             <TextView
130                 android:layout_width="wrap_content"
131                 android:layout_height="wrap_content"
132                 android:text="density2:"
133                 android:textStyle="bold" />
134 
135             <TextView
136                 android:id="@+id/tv_screen_density2"
137                 android:layout_width="wrap_content"
138                 android:layout_height="wrap_content" />
139 
140             <TextView
141                 android:layout_width="wrap_content"
142                 android:layout_height="wrap_content"
143                 android:layout_marginLeft="20dip"
144                 android:text="densityDPI2:"
145                 android:textStyle="bold" />
146 
147             <TextView
148                 android:id="@+id/tv_screen_densityDPI2"
149                 android:layout_width="wrap_content"
150                 android:layout_height="wrap_content" />
151         </LinearLayout>
152 
153         <TextView
154             android:layout_width="wrap_content"
155             android:layout_height="wrap_content"
156             android:layout_marginBottom="3dip"
157             android:layout_marginTop="3dip"
158             android:text="方法三:getDefaultDisplay().getMetrics(DisplayMetrics).H/W"
159             android:textColor="#aa66aa"
160             android:textSize="16sp" />
161 
162         <LinearLayout
163             android:layout_width="match_parent"
164             android:layout_height="wrap_content"
165             android:layout_margin="2dip"
166             android:layout_marginTop="3dip"
167             android:orientation="horizontal" >
168 
169             <TextView
170                 android:layout_width="wrap_content"
171                 android:layout_height="wrap_content"
172                 android:text="屏幕高(三):"
173                 android:textStyle="bold" />
174 
175             <TextView
176                 android:id="@+id/tv_screen_height3"
177                 android:layout_width="wrap_content"
178                 android:layout_height="wrap_content" />
179         </LinearLayout>
180 
181         <LinearLayout
182             android:layout_width="match_parent"
183             android:layout_height="wrap_content"
184             android:layout_margin="2dip"
185             android:orientation="horizontal" >
186 
187             <TextView
188                 android:layout_width="wrap_content"
189                 android:layout_height="wrap_content"
190                 android:text="屏幕宽(三):"
191                 android:textStyle="bold" />
192 
193             <TextView
194                 android:id="@+id/tv_screen_width3"
195                 android:layout_width="wrap_content"
196                 android:layout_height="wrap_content" />
197         </LinearLayout>
198 
199         <LinearLayout
200             android:layout_width="match_parent"
201             android:layout_height="wrap_content"
202             android:layout_margin="2dip"
203             android:layout_marginTop="3dip"
204             android:orientation="horizontal" >
205 
206             <TextView
207                 android:layout_width="wrap_content"
208                 android:layout_height="wrap_content"
209                 android:text="density3:"
210                 android:textStyle="bold" />
211 
212             <TextView
213                 android:id="@+id/tv_screen_density3"
214                 android:layout_width="wrap_content"
215                 android:layout_height="wrap_content" />
216 
217             <TextView
218                 android:layout_width="wrap_content"
219                 android:layout_height="wrap_content"
220                 android:layout_marginLeft="20dip"
221                 android:text="densityDPI3:"
222                 android:textStyle="bold" />
223 
224             <TextView
225                 android:id="@+id/tv_screen_densityDPI3"
226                 android:layout_width="wrap_content"
227                 android:layout_height="wrap_content" />
228         </LinearLayout>
229 
230         <TextView
231             android:layout_width="wrap_content"
232             android:layout_height="wrap_content"
233             android:layout_marginBottom="3dip"
234             android:layout_marginTop="3dip"
235             android:text="屏幕宽高(px/density)"
236             android:textColor="#aa66aa"
237             android:textSize="16sp" />
238 
239         <LinearLayout
240             android:layout_width="match_parent"
241             android:layout_height="wrap_content"
242             android:layout_margin="2dip"
243             android:layout_marginTop="3dip"
244             android:orientation="horizontal" >
245 
246             <TextView
247                 android:layout_width="wrap_content"
248                 android:layout_height="wrap_content"
249                 android:text="屏幕高:"
250                 android:textStyle="bold" />
251 
252             <TextView
253                 android:id="@+id/tv_screen_height4"
254                 android:layout_width="wrap_content"
255                 android:layout_height="wrap_content" />
256         </LinearLayout>
257 
258         <LinearLayout
259             android:layout_width="match_parent"
260             android:layout_height="wrap_content"
261             android:layout_margin="2dip"
262             android:orientation="horizontal" >
263 
264             <TextView
265                 android:layout_width="wrap_content"
266                 android:layout_height="wrap_content"
267                 android:text="屏幕宽:"
268                 android:textStyle="bold" />
269 
270             <TextView
271                 android:id="@+id/tv_screen_width4"
272                 android:layout_width="wrap_content"
273                 android:layout_height="wrap_content" />
274         </LinearLayout>
275 
276         <TextView
277             android:layout_width="wrap_content"
278             android:layout_height="wrap_content"
279             android:layout_marginBottom="3dip"
280             android:layout_marginTop="3dip"
281             android:text="科普:"
282             android:textColor="#aa66aa"
283             android:textSize="16sp" />
284 
285         <TextView
286             android:layout_width="wrap_content"
287             android:layout_height="wrap_content"
288             android:layout_margin="2dip"
289             android:text="density = densityDpi/160" />
290 
291         <TextView
292             android:layout_width="wrap_content"
293             android:layout_height="wrap_content"
294             android:layout_margin="2dip"
295             android:text="px(pixels) = dip * (densityDpi/160) = dip*density" />
296 
297         <TextView
298             android:layout_width="wrap_content"
299             android:layout_height="wrap_content"
300             android:layout_margin="2dip"
301             android:text="dip(device independent pixels) = dp " />
302 
303         <TextView
304             android:layout_width="wrap_content"
305             android:layout_margin="2dip"
306             android:layout_height="wrap_content"
307             android:text="dip = (px * 160)/densityDpi = px / density" />
308 
309         <TextView
310             android:layout_width="wrap_content"
311             android:layout_height="wrap_content"
312             android:layout_margin="20dip" />
313     </LinearLayout>
314 
315 </ScrollView>
fragment_main.xml
原文地址:https://www.cnblogs.com/zzw1994/p/5028730.html