Android常用的几个系统参数相关代码片段

1.收集设备信息，用于信息统计分析

public static Properties collectDeviceInfo(Context context) {
Properties mDeviceCrashInfo = new Properties();
try {
PackageManager pm = context.getPackageManager();
PackageInfo packageInfo = pm.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);
if (packageInfo != packageInfo) {
mDeviceCrashInfo.put("VERSION_NAME", packageInfo.versionName == null ? "not set" : packageInfo.versionName);
mDeviceCrashInfo.put("VERSION_CODE", packageInfo.versionCode);
}
} catch (PackageManager.NameNotFoundException e) {
Log.e("demo0606", "Error while collect package info", e);
}
Field[] fields = Build.class.getDeclaredFields();
for (Field field : fields) {
try { field.setAccessible(true);
mDeviceCrashInfo.put(field.getName(), field.get(null));
} catch (Exception e) {
Log.e("demo0606", "Error while collect crash info", e);
}
} return mDeviceCrashInfo;
}
public static String collectDeviceInfoStr(Context context) {
Properties prop = collectDeviceInfo(context);
Set deviceInfos = prop.keySet();
StringBuilder deviceInfoStr = new StringBuilder("");
for (Iterator iter = deviceInfos.iterator(); iter.hasNext();) {
Object item = iter.next(); deviceInfoStr.append( item + ":" + prop.get(item) + "\n");
}
return deviceInfoStr.toString();
}

2.是否有SD卡

public static boolean haveSDCard() {
return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
}

3.动态隐藏软键盘

@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void hideSoftInput(Activity activity) {
View view = activity.getWindow().peekDecorView();
if (view != null) {
InputMethodManager inputmanger = (InputMethodManager) activity .getSystemService(Context.INPUT_METHOD_SERVICE);
inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void hideSoftInput(Context context, EditText edit) {
edit.clearFocus();
InputMethodManager inputmanger = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE);
inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0);
}

4动态显示软键盘

@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void showSoftInput(Context context, EditText edit) {
edit.setFocusable(true); edit.setFocusableInTouchMode(true);
edit.requestFocus();
InputMethodManager inputManager = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.showSoftInput(edit, 0);
}

5.回到桌面，程序后台运行

public static void goHome(Context context) {
Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);
mHomeIntent.addCategory(Intent.CATEGORY_HOME);
mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
context.startActivity(mHomeIntent);
}

6.获取状态栏和标题栏高度(注意，如果没有ActionBar，那么获取的高度将和上面的是一样的，只有状态栏的高度)

public static int getTopBarHeight(Activity activity) {
return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT) .getTop();
}

7.获取MCC+MNC代码 (SIM卡运营商国家代码和运营商网络代码) 仅当用户已在网络注册时有效, CDMA 可能会无效

（中国移动：46000 46002, 中国联通：46001,中国电信：46003）

public static String getNetworkOperator(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE);
return telephonyManager.getNetworkOperator();
}