Android 获得屏幕宽高的三种方式

老风格，废话不多说了，直接给大家贴android获取屏幕宽高的代码了。

主要代码：

package com.km.screeninfo;
  import android.os.Bundle;
  import android.support.v.app.Fragment;
  import android.support.v.app.FragmentActivity;
  import android.util.DisplayMetrics;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 public class MainActivity extends FragmentActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
     }
   }
   
   public static class PlaceholderFragment extends Fragment {
     private TextView tvModel;
     private TextView tvScreenHeight;
     private TextView tvScreenHeight;
     private TextView tvScreenHeight;
     private TextView tvScreenWidth;
     private TextView tvScreenWidth;
     private TextView tvScreenWidth;
     private TextView tvScreenDensity;
     private TextView tvScreenDensityDPI;
     private TextView tvScreenDensity;
     private TextView tvScreenDensityDPI;
     private TextView tvScreenWidth;
     private TextView tvScreenHeight;
     public PlaceholderFragment() {
     }
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
tvModel = (TextView) rootView.findViewById(R.id.tv_model);
tvScreenHeight = (TextView) rootView.findViewById(R.id.tv_screen_height);
tvScreenHeight = (TextView) rootView.findViewById(R.id.tv_screen_height);
tvScreenHeight = (TextView) rootView.findViewById(R.id.tv_screen_height);
tvScreenHeight = (TextView) rootView.findViewById(R.id.tv_screen_height);
tvScreenWidth = (TextView) rootView.findViewById(R.id.tv_screen_width);
tvScreenWidth = (TextView) rootView.findViewById(R.id.tv_screen_width);
tvScreenWidth = (TextView) rootView.findViewById(R.id.tv_screen_width);
tvScreenWidth = (TextView) rootView.findViewById(R.id.tv_screen_width);
tvScreenDensity = (TextView) rootView.findViewById(R.id.tv_screen_density);
tvScreenDensityDPI = (TextView) rootView.findViewById(R.id.tv_screen_densityDPI);
tvScreenDensity = (TextView) rootView.findViewById(R.id.tv_screen_density);
tvScreenDensityDPI = (TextView) rootView.findViewById(R.id.tv_screen_densityDPI);
tvModel.setText(android.os.Build.MODEL);
// 获取屏幕密度（方法）
int screenWidth = getActivity().getWindowManager().getDefaultDisplay().getWidth(); // 屏幕宽（像素，如：px）
int screenHeight = getActivity().getWindowManager().getDefaultDisplay().getHeight(); // 屏幕高（像素，如：p）
tvScreenHeight.setText(screenHeight + " px");
tvScreenWidth.setText(screenWidth + " px");
// 获取屏幕密度（方法）
DisplayMetrics dm = getResources().getDisplayMetrics();
float density = dm.density; // 屏幕密度（像素比例：./././.）
int densityDPI = dm.densityDpi; // 屏幕密度（每寸像素：///）
float xdpi = dm.xdpi;
float ydpi = dm.ydpi;
int screenWidth = dm.widthPixels; // 屏幕宽（像素，如：px）
int screenHeight = dm.heightPixels; // 屏幕高（像素，如：px）
tvScreenHeight.setText(screenHeight + " px");
tvScreenWidth.setText(screenWidth + " px");
tvScreenDensity.setText(density + "");
tvScreenDensityDPI.setText(densityDPI + "");
// 获取屏幕密度（方法）
DisplayMetrics dm = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
density = dm.density; // 屏幕密度（像素比例：./././.）
densityDPI = dm.densityDpi; // 屏幕密度（每寸像素：///）
xdpi = dm.xdpi;
ydpi = dm.ydpi;
tvScreenDensity.setText(density + "");
tvScreenDensityDPI.setText(densityDPI + "");
int screenWidth = dm.widthPixels; // 屏幕宽（px，如：px）
int screenHeight = dm.heightPixels; // 屏幕高（px，如：px）
tvScreenHeight.setText(screenHeight + " px");
tvScreenWidth.setText(screenWidth + " px");
float screenWidthDip = (dm.widthPixels / density); // 屏幕宽（dip，如：dip）
float screenHeightDip = (dm.heightPixels / density); // 屏幕宽（dip，如：dip）
tvScreenHeight.setText(screenHeightDip + " dip");
tvScreenWidth.setText(screenWidthDip + " dip");
return rootView;
     }
   }
 } 

 activity_main.xml：

ps：在 Activity 中获得屏幕的宽和高

 int srceenW = this.getWindowManager().getDefaultDisplay().getWidth(); 
 int screenH = this.getWindowManager().getDefaultDisplay().getHeight(); 

如果需要适应不同分辨率的屏幕，则按照以下方式操作：

准备多套不同的图片：

分别放hdpi、mdpi、ldp文件夹中；

摆放控件的时候要得到屏幕宽高度，然后在程序中设定控件的百分乘屏幕的宽和高。