Android常用工具类

public class CommonUtil {

public static boolean hasSDCard() {

String status = Environment.getExternalStorageState();

return status.equals(Environment.MEDIA_MOUNTED);

}

/**

* 获取最大内存

*

* @return

*/

public static long getMaxMemory() {

return Runtime.getRuntime().maxMemory() / 1024;

}

/**

* 检查网络

*

* @param context

* @return

*/

public static boolean checkNetState(Context context) {

boolean netstate = false;

ConnectivityManager connectivity = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

if (connectivity != null) {

NetworkInfo[] info = connectivity.getAllNetworkInfo();

if (info != null) {

for (int i = 0; i < info.length; i++) {

if (info[i].getState() == NetworkInfo.State.CONNECTED) {

netstate = true;

break;

}

}

}

}

return netstate;

}

public static void showToast(Context context, String tip) {

Toast.makeText(context, tip, Toast.LENGTH_SHORT).show();

}

public static DisplayMetrics metric = new DisplayMetrics();

/**

* 得到屏幕高度

*

* @param context

* @return

*/

public static int getScreenHeight(Activity context) {

context.getWindowManager().getDefaultDisplay().getMetrics(metric);

return metric.heightPixels;

}

/**

* 得到屏幕宽度

*

* @param context

* @return

*/

public static int getScreenWidth(Activity context) {

context.getWindowManager().getDefaultDisplay().getMetrics(metric);

return metric.widthPixels;

}

/**

* 根据手机的分辨率从 dp 的单位 转成为 px(像素)

*/

public static int dip2px(Context context, float dpValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return (int) (dpValue * scale + 0.5f);

}

/**

* 根据手机的分辨率从 px(像素) 的单位 转成为 dp

*/

public static int px2dip(Context context, float pxValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return (int) (pxValue / scale + 0.5f);

}

/**

* 查询手机内非系统应用

*

* @param context

* @return

*/

public static List<PackageInfo> getAllApps(Context context) {

List<PackageInfo> apps = new ArrayList<PackageInfo>();

PackageManager pManager = context.getPackageManager();

// 获取手机内所有应用

List<PackageInfo> paklist = pManager.getInstalledPackages(0);

for (int i = 0; i < paklist.size(); i++) {

PackageInfo pak = (PackageInfo) paklist.get(i);

// 判断是否为非系统预装的应用程序

if ((pak.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) <= 0) {

// customs applications

apps.add(pak);

}

}

return apps;

}

public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {

int w = bitmap.getWidth();

int h = bitmap.getHeight();

Matrix matrix = new Matrix();

float scaleWidth = ((float) width / w);

float scaleHeight = ((float) height / h);

matrix.postScale(scaleWidth, scaleHeight);

Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

return newbmp;

}

/**

* 获取版本号和版本次数

*

* @param context

* @return

*/

public static String getVersionCode(Context context, int type) {

try {

PackageInfo pi = context.getPackageManager().getPackageInfo(

context.getPackageName(), 0);

if (type == 1) {

return String.valueOf(pi.versionCode);

} else {

return pi.versionName;

}

} catch (NameNotFoundException e) {

e.printStackTrace();

return null;

}

}

// 通过Service的类名来判断是否启动某个服务

public static boolean messageServiceIsStart(

List<ActivityManager.RunningServiceInfo> mServiceList,

String className) {

for (int i = 0; i < mServiceList.size(); i++) {

if (className.equals(mServiceList.get(i).service.getClassName())) {

return true;

}

}

return false;

}

}