Android获取常用辅助方法(获取屏幕高度、宽度、密度、通知栏高度、截图)

我们需要获取Android手机或Pad的屏幕的物理尺寸，以便于界面的设计或是其他功能的实现。下面就分享一下Android中常用的一些辅助方法：

获取屏幕高度：

/**
* 获得屏幕高度
* @param context
* @return
* by Hankkin at:2015-10-07 21:15:59
*/
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;
}

获取屏幕宽度：

/**
* 获得屏幕宽度
* @param context
* @return
* by Hankkin at:2015-10-07 21:16:13
*/
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;
}

获取屏幕密度：

/**
* 获取屏幕密度
* @param context
* @return
* by Hankkin at:2015-10-07 21:16:29
*/
public static float getScreenDensity(Context context) {
return context.getResources().getDisplayMetrics().density;
}

dip转px：

/**
* dip转px像素
* @param context
* @param px
* @return
* by Hankkin at:2015-10-07 21:16:43
*/
public static int dip2px(Context context, float px) {
final float scale = getScreenDensity(context);
return (int) (px * scale + 0.5);
}

获取状态栏高度：

/**
* 获得状态栏的高度
* @param context
* @return
* by Hankkin at:2015-10-07 21:16:43
*/
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;
}

获取屏幕当前截图：

/**
* 获取当前屏幕截图，包含状态栏
* @param activity
* @return
* by Hankkin at:2015-10-07 21:16:43
*/
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
* by Hankkin at:2015-10-07 21:16:43
*/
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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