Android基础：Android中的Manager

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1 WindowManager

WindowManager manager = (WindowManager) getSystemService(this.WINDOW_SERVICE);int width = manager.getDefaultDisplay().getWidth();int height = manager.getDefaultDisplay().getHeight();

或者：

        //创建对象        DisplayMetrics metrics = new DisplayMetrics();        //将宽高信息存放在对象中        MainActivity.this.getWindowManager().getDefaultDisplay().getMetrics(metrics);        //取值        int width = (int) (metrics.widthPixels/2 + 0.5);        int height = (int) (metrics.heightPixels/5+0.5);

2 PackageManager

                       PackageManager pm = getPackageManager();PackageInfo packageInfo = pm.getPackageInfo("com.android.mobilesafe", 0);//??localVersionCode = packageInfo.versionCode;localVersionName = packageInfo.versionName;tv_version_name.setText(localVersionName);</span>

3 TelphoneManager

权限：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

// 获取服务 注意加权限TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);// 获取序列卡号String sim = tm.getSimSerialNumber();

4 SmsManager

权限：

<uses-permission android:name="android.permission.SEND_SMS"/>

/** * destinationAddress:目标号码 * scAddress：当前手机号码 * text:短信内容 * sentIntent：null * deliveryIntent:null */SmsManager smsManager = SmsManager.getDefault();smsManager.sendTextMessage(destinationAddress, null, text,null, null);

5 LocationManager

LocationManager locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); if(!locManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){     // 未打开位置开关，可能导致定位失败或定位不准，提示用户或做相应处理}

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