android中和屏幕相关的操作

/**

* desc : 屏幕相关工具类

* 获取手机分辨率 getDeviceWidth、getDeviceHeight

* 设置透明状态栏(api大于19方可使用) setTransparentStatusBar

* 隐藏状态栏(注释萌萌哒) hideStatusBar

* 获取状态栏高度 getStatusBarHeight

* 判断状态栏是否存在 isStatusBarExists

* 获取ActionBar高度 getActionBarHeight

* 显示通知栏 showNotificationBar

* 隐藏通知栏 hideNotificationBar

* 设置屏幕为横屏(注释萌萌哒) setLandscape

* 获取屏幕截图 snapShotWithStatusBar、snapShotWithoutStatusBar

* 判断是否锁屏 isScreenLock

*/

public class ScreenUtils {

private ScreenUtils() {
}

/**
* 获取屏幕的宽度px
*
* @param context 上下文
* @return 屏幕宽px
*/
public static int getScreenWidth(Context context) {
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();// 创建了一张白纸
windowManager.getDefaultDisplay().getMetrics(outMetrics);// 给白纸设置宽高
return outMetrics.widthPixels;
}

/**
* 获取屏幕的高度px
*
* @param context 上下文
* @return 屏幕高px
*/
public static int getScreenHeight(Context context) {
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();// 创建了一张白纸
windowManager.getDefaultDisplay().getMetrics(outMetrics);// 给白纸设置宽高
return outMetrics.heightPixels;
}

/**
* 设置透明状态栏(api大于19方可使用)
* <p>可在Activity的onCreat()中调用</p>
* <p>需在顶部控件布局中加入以下属性让内容出现在状态栏之下</p>
* <p>android:clipToPadding="true"</p>
* <p>android:fitsSystemWindows="true"</p>
*
* @param activity activity
*/
public static void setTransparentStatusBar(Activity activity) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
//透明状态栏
activity.getWindow().addFlags(LayoutParams.FLAG_TRANSLUCENT_STATUS);
//透明导航栏
activity.getWindow().addFlags(LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
}
}

/**
* 隐藏状态栏
* <p>也就是设置全屏，一定要在setContentView之前调用，否则报错</p>
* <p>此方法Activity可以继承AppCompatActivity</p>
* <p>启动的时候状态栏会显示一下再隐藏，比如QQ的欢迎界面</p>
* <p>在配置文件中Activity加属性android:theme="@android:style/Theme.NoTitleBar.Fullscreen"</p>
* <p>如加了以上配置Activity不能继承AppCompatActivity，会报错</p>
*
* @param activity activity
*/
public static void hideStatusBar(Activity activity) {
activity.requestWindowFeature(Window.FEATURE_NO_TITLE);
activity.getWindow().setFlags(LayoutParams.FLAG_FULLSCREEN,
LayoutParams.FLAG_FULLSCREEN);
}

/**
* 获取状态栏高度
*
* @param context 上下文
* @return 状态栏高度
*/
public static int getStatusBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources()
.getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}

/**
* 判断状态栏是否存在
*
* @param activity activity
* @return {@code true}: 存在<br>{@code false}: 不存在
*/
public static boolean isStatusBarExists(Activity activity) {
LayoutParams params = activity.getWindow().getAttributes();
return (params.flags & LayoutParams.FLAG_FULLSCREEN) != LayoutParams.FLAG_FULLSCREEN;
}

/**
* 获取ActionBar高度
*
* @param activity activity
* @return ActionBar高度
*/
public static int getActionBarHeight(Activity activity) {
TypedValue tv = new TypedValue();
if (activity.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
return TypedValue.complexToDimensionPixelSize(tv.data, activity.getResources().getDisplayMetrics());
}
return 0;
}

/**
* 显示通知栏
* <p>需添加权限 {@code <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>}</p>
*
* @param context        上下文
* @param isSettingPanel {@code true}: 打开设置<br>{@code false}: 打开通知
*/
public static void showNotificationBar(Context context, boolean isSettingPanel) {
String methodName = (Build.VERSION.SDK_INT <= 16) ? "expand"
: (isSettingPanel ? "expandSettingsPanel" : "expandNotificationsPanel");
invokePanels(context, methodName);
}

/**
* 隐藏通知栏
* <p>需添加权限 {@code <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>}</p>
*
* @param context 上下文
*/
public static void hideNotificationBar(Context context) {
String methodName = (Build.VERSION.SDK_INT <= 16) ? "collapse" : "collapsePanels";
invokePanels(context, methodName);
}

/**
* 反射唤醒通知栏
*
* @param context    上下文
* @param methodName 方法名
*/
private static void invokePanels(Context context, String methodName) {
try {
Object service = context.getSystemService("statusbar");
Class<?> statusBarManager = Class.forName("android.app.StatusBarManager");
Method expand = statusBarManager.getMethod(methodName);
expand.invoke(service);
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 设置屏幕为横屏
* <p>还有一种就是在Activity中加属性android:screenOrientation="landscape"</p>
* <p>不设置Activity的android:configChanges时，切屏会重新调用各个生命周期，切横屏时会执行一次，切竖屏时会执行两次</p>
* <p>设置Activity的android:configChanges="orientation"时，切屏还是会重新调用各个生命周期，切横、竖屏时只会执行一次</p>
* <p>设置Activity的android:configChanges="orientation|keyboardHidden|screenSize"（4.0以上必须带最后一个参数）时
* 切屏不会重新调用各个生命周期，只会执行onConfigurationChanged方法</p>
*
* @param activity activity
*/
public static void setLandscape(Activity activity) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}

/**
* 获取当前屏幕截图，包含状态栏
*
* @param activity activity
* @return Bitmap
*/
public static Bitmap captureWithStatusBar(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 = 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
* <p>需要用到上面获取状态栏高度getStatusBarHeight的方法</p>
*
* @param activity activity
* @return Bitmap
*/
public static Bitmap captureWithoutStatusBar(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int statusBarHeight = getStatusBarHeight(activity);
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return bp;
}

/**
* 判断是否锁屏
*
* @param context 上下文
* @return {@code true}: 是<br>{@code false}: 否
*/
public static boolean isScreenLock(Context context) {
KeyguardManager km = (KeyguardManager) context
.getSystemService(Context.KEYGUARD_SERVICE);
return km.inKeyguardRestrictedInputMode();
}

}

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