我创建了一些自定义元素，并希望以编程方式将它们放置在右上角（距离上边缘n个像素，距离右边缘m个像素）。因此，我需要获得屏幕宽度和屏幕高度，然后设置位置：
int px = screenWidth - m;
int py = screenHeight - n;
如何在主活动中获取screenWidth和screenHeight？
当前回答
我尝试了所有可能的“解决方案”，但都失败了，我注意到Elliott Hughes的“Dalvik Explorer”应用程序在任何Android设备/操作系统版本上都始终显示正确的维度。我最后看了他的开源项目，可以在这里找到：https://code.google.com/p/enh/
以下是所有相关代码：
WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
try {
// used when 17 > SDK_INT >= 14; includes window decorations (statusbar bar/menu bar)
widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
try {
// used when SDK_INT >= 17; includes window decorations (statusbar bar/menu bar)
Point realSize = new Point();
Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
widthPixels = realSize.x;
heightPixels = realSize.y;
} catch (Exception ignored) {
}
EDIT：略有改进的版本（避免在不受支持的OS版本上触发异常）：
WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 14 && Build.VERSION.SDK_INT < 17)
try {
widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 17)
try {
Point realSize = new Point();
Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
widthPixels = realSize.x;
heightPixels = realSize.y;
} catch (Exception ignored) {
}
其他回答
我有两个函数，一个用于发送上下文，另一个用于获取像素的高度和宽度：
public static int getWidth(Context mContext){
int width=0;
WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
if(Build.VERSION.SDK_INT>12){
Point size = new Point();
display.getSize(size);
width = size.x;
}
else{
width = display.getWidth(); // Deprecated
}
return width;
}
and
public static int getHeight(Context mContext){
int height=0;
WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
if(Build.VERSION.SDK_INT>12){
Point size = new Point();
display.getSize(size);
height = size.y;
}
else{
height = display.getHeight(); // Deprecated
}
return height;
}
我尝试了所有可能的“解决方案”，但都失败了，我注意到Elliott Hughes的“Dalvik Explorer”应用程序在任何Android设备/操作系统版本上都始终显示正确的维度。我最后看了他的开源项目，可以在这里找到：https://code.google.com/p/enh/
以下是所有相关代码：
WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
try {
// used when 17 > SDK_INT >= 14; includes window decorations (statusbar bar/menu bar)
widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
try {
// used when SDK_INT >= 17; includes window decorations (statusbar bar/menu bar)
Point realSize = new Point();
Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
widthPixels = realSize.x;
heightPixels = realSize.y;
} catch (Exception ignored) {
}
EDIT：略有改进的版本（避免在不受支持的OS版本上触发异常）：
WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 14 && Build.VERSION.SDK_INT < 17)
try {
widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 17)
try {
Point realSize = new Point();
Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
widthPixels = realSize.x;
heightPixels = realSize.y;
} catch (Exception ignored) {
}
以下是低于/高于API 30代码的Kotlin扩展函数：
fun Activity.getScreenWidth(): Int {
return if (Build.VERSION.SDK_INT < 30) {
val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)
displayMetrics.widthPixels
} else {
val metrics = windowManager.currentWindowMetrics
val insets = metrics.windowInsets
.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars())
metrics.bounds.width() - insets.left - insets.right
}
}
fun Activity.getScreenHeight(): Int {
return if (Build.VERSION.SDK_INT < 30) {
val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)
displayMetrics.heightPixels
} else {
val metrics = windowManager.currentWindowMetrics
val insets = metrics.windowInsets
.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars())
metrics.bounds.height() - insets.top - insets.bottom
}
}
对应的Java助手方法：
public int getScreenWidth(Activity activity) {
if (Build.VERSION.SDK_INT < 30) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics.widthPixels;
} else {
WindowMetrics metrics = activity.getWindowManager().getCurrentWindowMetrics();
Insets insets = metrics.getWindowInsets()
.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars());
return metrics.getBounds().width() - insets.left - insets.right;
}
}
public int getScreenHeight(Activity activity) {
if (Build.VERSION.SDK_INT < 30) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics.heightPixels;
} else {
WindowMetrics metrics = activity.getWindowManager().getCurrentWindowMetrics();
Insets insets = metrics.getWindowInsets()
.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars());
return metrics.getBounds().height() - insets.bottom - insets.top;
}
}
现在在Api 30级别上，应该这样做
final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
// Gets all excluding insets
final WindowInsets windowInsets = metrics.getWindowInsets();
Insets insets = windowInsets.getInsetsIgnoreVisibility(WindowInsets.Type.navigationBars()
| WindowInsets.Type.displayCutout());
int insetsWidth = insets.right + insets.left;
int insetsHeight = insets.top + insets.bottom;
// Legacy size that Display#getSize reports
final Rect bounds = metrics.getBounds();
final Size legacySize = new Size(bounds.width() - insetsWidth,
bounds.height() - insetsHeight);
科特林
fun getScreenHeight(activity: Activity): Int {
val metrics = DisplayMetrics()
activity.windowManager.defaultDisplay.getMetrics(metrics)
return metrics.heightPixels
}
fun getScreenWidth(activity: Activity): Int {
val metrics = DisplayMetrics()
activity.windowManager.defaultDisplay.getMetrics(metrics)
return metrics.widthPixels
}
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