本文实例讲述了Android开发中4个常用的工具类。分享给大家供大家参考，具体如下：
1、土司工具类（Toast管理）
public class ToastUtil {
private ToastUtil() {
throw new UnsupportedOperationException("cannot be instantiated");
}
public static boolean isShow = true;
public static void show(Context context, CharSequence message) {
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
public static void showShort(Context context, int message) {
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
public static void showLong(Context context, CharSequence message) {
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
public static void showLong(Context context, int message) {
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
public static void show(Context context, CharSequence message, int duration) {
if (isShow)
Toast.makeText(context, message, duration).show();
}
public static void show(Context context, int message, int duration) {
if (isShow)
Toast.makeText(context, message, duration).show();
}
}
2、SharedPreferences工具类
public class SPUtils {
public static final String FILE_NAME = "share_data";
public static void put(Context context, String key, Object object) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
if (object instanceof String) {
editor.putString(key, (String) object);
} else if (object instanceof Integer) {
editor.putInt(key, (Integer) object);
} else if (object instanceof Boolean) {
editor.putBoolean(key, (Boolean) object);
} else if (object instanceof Float) {
editor.putFloat(key, (Float) object);
} else if (object instanceof Long) {
editor.putLong(key, (Long) object);
} else {
editor.putString(key, object.toString());
}
SharedPreferencesCompat.apply(editor);
}
public static Object get(Context context, String key, Object defaultObject) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
if (defaultObject instanceof String) {
return sp.getString(key, (String) defaultObject);
} else if (defaultObject instanceof Integer) {
return sp.getInt(key, (Integer) defaultObject);
} else if (defaultObject instanceof Boolean) {
return sp.getBoolean(key, (Boolean) defaultObject);
} else if (defaultObject instanceof Float) {
return sp.getFloat(key, (Float) defaultObject);
} else if (defaultObject instanceof Long) {
return sp.getLong(key, (Long) defaultObject);
}
return null;
}
public static void remove(Context context, String key) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
}
public static void clear(Context context) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
}
public static boolean contains(Context context, String key) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.contains(key);
}
public static Map getAll(Context context) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.getAll();
}
private static class SharedPreferencesCompat {
private static final Method sApplyMethod = findApplyMethod();
@SuppressWarnings({ "unchecked", "rawtypes" })
private static Method findApplyMethod() {
try {
Class clz = SharedPreferences.Editor.class;
return clz.getMethod("apply");
} catch (NoSuchMethodException e) {
}
return null;
}
public static void apply(SharedPreferences.Editor editor) {
try {
if (sApplyMethod != null) {
sApplyMethod.invoke(editor);
return;
}
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
editor.commit();
}
}
}
3、网络工具类
public class NetUtils {
private NetUtils() {
throw new UnsupportedOperationException("cannot be instantiated");
}
public static boolean isConnected(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null != connectivity) {
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (null != info && info.isConnected()) {
if (info.getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
return false;
}
public static boolean isWifi(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null)
return false;
return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
}
public static void openSetting(Activity activity) {
Intent intent = new Intent("/");
ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
intent.setComponent(cm);
intent.setAction("android.intent.action.VIEW");
activity.startActivityForResult(intent, 0);
}
}
4、获得屏幕相关的辅助类
public class ScreenUtils {
private ScreenUtils() {
throw new UnsupportedOperationException("cannot be instantiated");
}
public static int getScreenWidth(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
public static int getScreenHeight(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
public static int getStatusHeight(Context context) {
int statusHeight = -1;
try {
Class clazz = Class.forName("com.android.internal.R$dimen");
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField("status_bar_height").get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e) {
e.printStackTrace();
}
return statusHeight;
}
public static Bitmap snapShotWithStatusBar(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
view.destroyDrawingCache();
return bp;
}
public static Bitmap snapShotWithoutStatusBar(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayframe(frame);
int statusBarHeight = frame.top;
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return bp;
}
}
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希望本文所述对大家Android程序设计有所帮助。
