在之前的 Android 开发过程中，总结了许多的工具类，像类似的工具类其实有很多，这里罗列出一些自己常用到的。其中有些是别人写的，有些是自己总结的，抱歉，有些我实在找不到谁才是原创，下面这些工具类当中，有单位换算 (DensityUtils)，屏幕宽高获取(ScreenUtils)，新式吐司交互类(SnackbarUtil)，SharedPreferences 持久化常用方法的封装(SPUtils)，状态栏的设置(StatusBarUtil)，日志工具类(LogUtils)，Toast 封装(ToastUtils)，这里面的大多数自己都用过，谁用谁知道！
DensityUtils.java
public class DensityUtils { //利用 Android 自带 API public static int dp2px(Context context, float dpVal){ return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal, context.getResources().getDisplayMetrics()); } public float dp2px(float dp) { final float scale = getResources().getDisplayMetrics().density; return dp * scale + 0.5f; } //利用 Android 自带 API public static int sp2px(Context context, float spVal){ return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, context.getResources().getDisplayMetrics()); } public float sp2px(float sp) { final float scale = getResources().getDisplayMetrics().scaledDensity; return sp * scale; } //利用 Android 自带 API px converteTo dp public static float px2dp(Context context, float pxVal) { final float scale = context.getResources().getDisplayMetrics().density; return (pxVal / scale); } //利用 Android 自带 API px converteTo sp public static float px2sp(Context context, float pxVal) { return (pxVal / context.getResources().getDisplayMetrics().scaledDensity); } }复制代码 项目中经常要用到 单位转换，这个可以说是必备的
SPUtils.java
public class SPUtils { public static final String PREF_NMAE = "config"; public static boolean getBoolan(Context context, String key, boolean defaultVal) { SharedPreferences sp = context.getSharedPreferences(PREF_NMAE, Context.MODE_PRIVATE); return sp.getBoolean(key, defaultVal); } public static void setBoolean(Context context, String key, boolean defaultVal) { SharedPreferences sp = context.getSharedPreferences(PREF_NMAE, Context.MODE_PRIVATE); sp.edit().putBoolean(key, defaultVal).commit(); } public static String getString(Context context, String key, String defaultVal) { SharedPreferences sp = context.getSharedPreferences(PREF_NMAE, Context.MODE_PRIVATE); return sp.getString(key, defaultVal); } public static void setString(Context context, String key, String defaultVal) { SharedPreferences sp = context.getSharedPreferences(PREF_NMAE, Context.MODE_PRIVATE); sp.edit().putString(key, defaultVal).commit(); }}复制代码 ToastUtils.java
public class ToastUtils { public static Toast mToast; //单例的吐司 public static void singleTanceToast(Context context,String msg){ if (mToast == null) { mToast = Toast.makeText(context, "", Toast.LENGTH_SHORT); } mToast.setText(msg); mToast.show(); } //短显示toast public static void shortShowToast(Context context,String message){ if (mToast == null){ mToast = Toast.makeText(context,message,Toast.LENGTH_SHORT); } mToast.show(); } //长显示toast public static void longShowToast(Context context, String message) { if (mToast == null) { mToast = Toast.makeText(context, message, Toast.LENGTH_LONG); } mToast.show(); } //自定义时长显示toast public static void customShowToast(Context context,String message,int duration){ if (mToast == null){ mToast = Toast.makeText(context,message,Toast.LENGTH_LONG); } mToast.setDuration(duration); mToast.show(); } /* * 带图片的吐司 * backgroud 图片id * msg 显示的字符 * mContext 上下文 */ public static void showToastWithImage(Context mContext, int background, String msg) { if (mToast == null) { //mToast = Toast.makeText(mContext, "", Toast.LENGTH_SHORT); mToast = new Toast(mContext); } LinearLayout mLinearLayout = new LinearLayout(mContext); TextView mTextView = new TextView(mContext); mTextView.setText(msg); mTextView.setGravity(Gravity.CENTER_VERTICAL);// 设置文字居中 mTextView.setTextSize(16); mTextView.setTextColor(Color.WHITE);// 字体大小和颜色 mTextView.setCompoundDrawablesWithIntrinsicBounds(background, 0, 0, 0); mLinearLayout.setBackgroundResource(android.R.drawable.toast_frame);//Android自带的背景色 mLinearLayout.addView(mTextView); mToast.setView(mLinearLayout); mToast.setGravity(Gravity.CENTER, 0, 0); mToast.show(); }}复制代码 LogUtils.java
public class LogUtils { public static final int VERBOSE = 1; public static final int DEBUG = 2; public static final int INFO = 3; public static final int WARN = 4; public static final int ERROR = 5; public static final int NOTHING = 6; public static final int LEVEL = VERBOSE; public static void v(String tag, String msg) { if (LEVEL <= VERBOSE) { Log.v(tag, msg); } } public static void d(String tag, String msg) { if (LEVEL <= DEBUG) { Log.d(tag, msg); } } public static void i(String tag, String msg) { if (LEVEL <= INFO) { Log.i(tag, msg); } } public static void w(String tag, String msg) { if (LEVEL <= WARN) { Log.w(tag, msg); } } public static void e(String tag, String msg) { if (LEVEL <= ERROR) { Log.e(tag, msg); } }}复制代码 这个不错，记得在郭神的书里面有介绍
StatusBarUtil.java
public class StatusBarUtil { /** * 修改状态栏为全透明 * @param activity */ @TargetApi(19) public static void transparencyBar(Activity activity) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Window window = activity.getWindow(); window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION); window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE); window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); window.setStatusBarColor(Color.TRANSPARENT); window.setNavigationBarColor(Color.TRANSPARENT); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { Window window = activity.getWindow(); window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); } } /** * 修改状态栏颜色，支持4.4以上版本 * @param activity * @param colorId */ public static void setStatusBarColor(Activity activity, int colorId) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { Window window = activity.getWindow();// window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); window.setStatusBarColor(activity.getResources().getColor(colorId)); } } /** * 设置状态栏黑色字体图标， * 适配4.4以上版本MIUIV、Flyme和6.0以上版本其他Android * * @param activity * @return 1:MIUUI 2:Flyme 3:android6.0 */ public static int StatusBarLightMode(Activity activity) { int result = 0; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { if (MIUISetStatusBarLightMode(activity.getWindow(), true)) { result = 1; } else if (FlymeSetStatusBarLightMode(activity.getWindow(), true)) { result = 2; } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); result = 3; } } return result; } /** * 已知系统类型时，设置状态栏黑色字体图标。 * 适配4.4以上版本MIUIV、Flyme和6.0以上版本其他Android * @param activity * @param type 1:MIUUI 2:Flyme 3:android6.0 */ public static void StatusBarLightMode(Activity activity, int type) { if (type == 1) { MIUISetStatusBarLightMode(activity.getWindow(), true); } else if (type == 2) { FlymeSetStatusBarLightMode(activity.getWindow(), true); } else if (type == 3) { activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); } } /** * 清除MIUI或flyme或6.0以上版本状态栏黑色字体 */ public static void StatusBarDarkMode(Activity activity, int type) { if (type == 1) { MIUISetStatusBarLightMode(activity.getWindow(), false); } else if (type == 2) { FlymeSetStatusBarLightMode(activity.getWindow(), false); } else if (type == 3) { activity.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE); } } /** * 设置状态栏图标为深色和魅族特定的文字风格 * 可以用来判断是否为Flyme用户 * @param window 需要设置的窗口 * @param dark 是否把状态栏字体及图标颜色设置为深色 * @return boolean 成功执行返回true */ public static boolean FlymeSetStatusBarLightMode(Window window, boolean dark) { boolean result = false; if (window != null) { try { WindowManager.LayoutParams lp = window.getAttributes(); Field darkFlag = WindowManager.LayoutParams.class.getDeclaredField("MEIZU_FLAG_DARK_STATUS_BAR_ICON"); Field meizuFlags = WindowManager.LayoutParams.class.getDeclaredField("meizuFlags"); darkFlag.setAccessible(true); meizuFlags.setAccessible(true); int bit = darkFlag.getInt(null); int value = meizuFlags.getInt(lp); if (dark) { value |= bit; } else { value &= ~bit; } meizuFlags.setInt(lp, value); window.setAttributes(lp); result = true; } catch (Exception e) { e.printStack(); } } return result; } /** * 设置状态栏字体图标为深色，需要MIUIV6以上 * @param window 需要设置的窗口 * @param dark 是否把状态栏字体及图标颜色设置为深色 * @return boolean 成功执行返回true */ public static boolean MIUISetStatusBarLightMode(Window window, boolean dark) { boolean result = false; if (window != null) { Class clazz = window.getClass(); try { int darkModeFlag = 0; Class layoutParams = Class.forName("android.view.MiuiWindowManager$LayoutParams"); Field field = layoutParams.getField("EXTRA_FLAG_STATUS_BAR_DARK_MODE"); darkModeFlag = field.getInt(layoutParams); Method extraFlagField = clazz.getMethod("setExtraFlags", int.class, int.class); if (dark) { extraFlagField.invoke(window, darkModeFlag, darkModeFlag);//状态栏透明且黑色字体 } else { extraFlagField.invoke(window, 0, darkModeFlag);//清除黑色字体 } result = true; } catch (Exception e) { } } return result; }}复制代码 SnackbarUtil.java
public class SnackbarUtil { public static final int Info = 1; public static final int Confirm = 2; public static final int Warning = 3; public static final int Alert = 4; public static int red = 0xfff44336; public static int green = 0xff4caf50; public static int blue = 0xff2195f3; public static int orange = 0xffffc107; /** * 短显示Snackbar，自定义颜色 * @param view * @param message * @param messageColor * @param backgroundColor * @return */ public static Snackbar ShortSnackbar(View view, String message, int messageColor, int backgroundColor){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_SHORT); setSnackbarColor(snackbar,messageColor,backgroundColor); return snackbar; } /** * 长显示Snackbar，自定义颜色 * @param view * @param message * @param messageColor * @param backgroundColor * @return */ public static Snackbar LongSnackbar(View view, String message, int messageColor, int backgroundColor){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_LONG); setSnackbarColor(snackbar,messageColor,backgroundColor); return snackbar; } /** * 自定义Snackbar显示时长，自定义颜色 * @param view * @param message * @param messageColor * @param backgroundColor * @return */ public static Snackbar IndefiniteSnackbar(View view, String message, int duration, int messageColor, int backgroundColor){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_INDEFINITE).setDuration(duration); setSnackbarColor(snackbar,messageColor,backgroundColor); return snackbar; } /** * 短显示Snackbar，可选预设类型 * @param view * @param message * @param type * @return */ public static Snackbar ShortSnackbar(View view, String message, int type){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_SHORT); switchType(snackbar,type); return snackbar; } /** * 长显示Snackbar，可选预设类型 * @param view * @param message * @param type * @return */ public static Snackbar LongSnackbar(View view, String message, int type){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_LONG); switchType(snackbar,type); return snackbar; } /** * 自定义时常显示Snackbar，可选预设类型 * @param view * @param message * @param type * @return */ public static Snackbar IndefiniteSnackbar(View view, String message, int duration, int type){ Snackbar snackbar = Snackbar.make(view,message, Snackbar.LENGTH_INDEFINITE).setDuration(duration); switchType(snackbar,type); return snackbar; } //选择预设类型 private static void switchType(Snackbar snackbar, int type){ switch (type){ case Info: setSnackbarColor(snackbar,blue); break; case Confirm: setSnackbarColor(snackbar,green); break; case Warning: setSnackbarColor(snackbar,orange); break; case Alert: setSnackbarColor(snackbar, Color.YELLOW,red); break; } } /** * 设置Snackbar背景颜色 * @param snackbar * @param backgroundColor */ public static void setSnackbarColor(Snackbar snackbar, int backgroundColor) { View view = snackbar.getView(); if(view!=null){ view.setBackgroundColor(backgroundColor); } } /** * 设置Snackbar文字和背景颜色 * @param snackbar * @param messageColor * @param backgroundColor */ public static void setSnackbarColor(Snackbar snackbar, int messageColor, int backgroundColor) { View view = snackbar.getView(); if(view!=null){ view.setBackgroundColor(backgroundColor); ((TextView) view.findViewById(R.id.snackbar_text)).setTextColor(messageColor); } } /** * 向Snackbar中添加view * @param snackbar * @param layoutId * @param index 新加布局在Snackbar中的位置 */ public static void SnackbarAddView(Snackbar snackbar, int layoutId, int index) { View snackbarview = snackbar.getView(); Snackbar.SnackbarLayout snackbarLayout=(Snackbar.SnackbarLayout)snackbarview; View add_view = LayoutInflater.from(snackbarview.getContext()).inflate(layoutId,null); LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); p.gravity= Gravity.CENTER_VERTICAL; snackbarLayout.addView(add_view,index,p); }}复制代码 这个是从一个大神的项目中拿出来的，也挺不错的，现在还没用过 SnackBar 就真说不过去了！
ScreenUtils.java
public class ScreenUtils { /** * 获得屏幕高度 * @param context * @return */ 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; } /** * 获得屏幕宽度 * @param context * @return */ 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; } /** * 获得状态栏的高度 * @param context * @return */ 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; } /** * 获取当前屏幕截图，包含状态栏 * @param activity * @return */ 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; } /** * 获取当前屏幕截图，不包含状态栏 * @param activity * @return */ 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; } }复制代码