Android獲得螢幕解析度的兩種方法

package com.wufen.allapp;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.util.DisplayMetrics;import android.view.Display;import android.view.Menu;import android.view.WindowManager;import android.widget.TextView;import java.util.List;public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final PackageManager packageManager = this.getPackageManager();        final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);       // mainIntent.setPackage(packageName);               final List<ResolveInfo> apps = packageManager.queryIntentActivities(mainIntent, 0);                        // 方法1 Android獲得螢幕的寬和高          WindowManager windowManager = getWindowManager();          Display display = windowManager.getDefaultDisplay();          int screenWidth = screenWidth = display.getWidth();          int screenHeight = screenHeight = display.getHeight();                    // 方法2         DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        TextView tv = (TextView)this.findViewById(R.id.tv);        float width=dm.widthPixels*dm.density;         float height=dm.heightPixels*dm.density;         tv.setText("First method:"+dm.toString()+"\n"+"Second method:"+"Y="+screenWidth+";X="+screenHeight);         //dm.widthPixels,dm.heightPixels    }}