我需要使用dip/dp(在java文件中)编码android小部件的布局。在运行时，如果我编码， .getWidth .getDefaultDisplay int像素= this.getWindowManager () () ();
返回屏幕宽度(像素)。为了将其转换为dp，我编写了如下代码: int dp =pixel/(int)getResources().getDisplayMetrics().density; 这似乎没有返回正确的答案。我做了WVGA800的模拟器，屏幕分辨率是480 * 800。当运行模拟器并让代码打印像素和dp值时，两者都是320。该模拟器为240 dpi，比例因子为0.75。
当前回答
在DP方面获得屏幕宽度和高度，并进行良好的装饰:
步骤1:创建接口
public interface ScreenInterface {
float getWidth();
float getHeight();
}
步骤2:创建实现者类
public class Screen implements ScreenInterface {
private Activity activity;
public Screen(Activity activity) {
this.activity = activity;
}
private DisplayMetrics getScreenDimension(Activity activity) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics;
}
private float getScreenDensity(Activity activity) {
return activity.getResources().getDisplayMetrics().density;
}
@Override
public float getWidth() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.widthPixels / getScreenDensity(activity);
}
@Override
public float getHeight() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.heightPixels / getScreenDensity(activity);
}
}
第三步:在活动中获取宽度和高度:
Screen screen = new Screen(this); // Setting Screen
screen.getWidth();
screen.getHeight();
其他回答
在DP方面获得屏幕宽度和高度，并进行良好的装饰:
步骤1:创建接口
public interface ScreenInterface {
float getWidth();
float getHeight();
}
步骤2:创建实现者类
public class Screen implements ScreenInterface {
private Activity activity;
public Screen(Activity activity) {
this.activity = activity;
}
private DisplayMetrics getScreenDimension(Activity activity) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics;
}
private float getScreenDensity(Activity activity) {
return activity.getResources().getDisplayMetrics().density;
}
@Override
public float getWidth() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.widthPixels / getScreenDensity(activity);
}
@Override
public float getHeight() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.heightPixels / getScreenDensity(activity);
}
}
第三步:在活动中获取宽度和高度:
Screen screen = new Screen(this); // Setting Screen
screen.getWidth();
screen.getHeight();
这是一个基于前面响应的复制/粘贴函数。
/**
* @param context
* @return the Screen height in DP
*/
public static float getHeightDp(Context context) {
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
float dpHeight = displayMetrics.heightPixels / displayMetrics.density;
return dpHeight;
}
/**
* @param context
* @return the screnn width in dp
*/
public static float getWidthDp(Context context) {
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
float dpWidth = displayMetrics.widthPixels / displayMetrics.density;
return dpWidth;
}
您缺少默认密度值160。
2 px = 3 dip if dpi == 80(ldpi), 320x240 screen
1 px = 1 dip if dpi == 160(mdpi), 480x320 screen
3 px = 2 dip if dpi == 240(hdpi), 840x480 screen
换句话说，如果你在纵向模式下设计宽度为160dip的布局，它将在所有ldpi/mdpi/hdpi设备上占屏幕的一半(我认为平板电脑除外)
正如@Tomáš Hubálek提到的; 试着这样做:
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
float dpHeight = displayMetrics.heightPixels / displayMetrics.density;
float dpWidth = displayMetrics.widthPixels / displayMetrics.density;
OR
试试老答案:
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics outMetrics = new DisplayMetrics ();
display.getMetrics(outMetrics);
float density = getResources().getDisplayMetrics().density;
float dpHeight = outMetrics.heightPixels / density;
float dpWidth = outMetrics.widthPixels / density;
2023答案简化Kotlin:
val widthDp = resources.displayMetrics.run { widthPixels / density }
val heightDp = resources.displayMetrics.run { heightPixels / density }
一行程序:
val (height, width) = resources.displayMetrics.run { heightPixels/density to widthPixels/density }
对于Jetpack撰写:
val (height, width) = LocalConfiguration.current.run { screenHeightDp.dp to screenWidthDp.dp }
