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
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int width_px = Resources.getSystem().getDisplayMetrics().widthPixels;
int height_px =Resources.getSystem().getDisplayMetrics().heightPixels;
int pixeldpi = Resources.getSystem().getDisplayMetrics().densityDpi;
int width_dp = (width_px/pixeldpi)*160;
int height_dp = (height_px/pixeldpi)*160;
其他回答
用这个代替怎么样?
final DisplayMetrics displayMetrics=getResources().getDisplayMetrics();
final float screenWidthInDp=displayMetrics.widthPixels/displayMetrics.density;
final float screenHeightInDp=displayMetrics.heightPixels/displayMetrics.density;
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int width_px = Resources.getSystem().getDisplayMetrics().widthPixels;
int height_px =Resources.getSystem().getDisplayMetrics().heightPixels;
int pixeldpi = Resources.getSystem().getDisplayMetrics().densityDpi;
int width_dp = (width_px/pixeldpi)*160;
int height_dp = (height_px/pixeldpi)*160;
用kotlin回答:
context?.let {
val displayMetrics = it.resources.displayMetrics
val dpHeight = displayMetrics.heightPixels / displayMetrics.density
val dpWidth = displayMetrics.widthPixels / displayMetrics.density
}
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;
}
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();
