注意,数据的获取应该在onWindowFocusChanged函数中进行,防止数据获取错误。 首先声明整个手机屏幕的获取:
activity.getWindowManager().getDefaultDisplay();
声明整个应用(除了状态栏之外的区域的获取):
Rect outRect = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);
得到除了状态栏和标题栏之外的View绘制的区域:
Rect outRect = new Rect();
activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getDrawingRect(outRect);
在得到了绘制的区域之后我们来得到所要计算的高度: 一、状态栏的高度:
Rect frame = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
另外常用的两种方式: 首先是反射的方式:
int statusBarHeight=0;
try {
Class clazz=Class.forName("com.android.internal.R$dimen");
Object object=clazz.newInstance();
Field field=clazz.getField("status_bar_height");
//反射出该对象中status_bar_height字段所对应的在R文件的id值
//该id值由系统工具自动生成,文档描述如下:
//The desired resource identifier, as generated by the aapt tool.
int id = Integer.parseInt(field.get(object).toString());
System.out.println("id="+id);
//依据id值获取到状态栏的高度,单位为像素
statusBarHeight = context.getResources().getDimensionPixelSize(id);
System.out.println("statusBarHeight="+statusBarHeight+"pixel");
} catch (Exception e) {
}
其次:
int result=0;
int resourceId=getResources().getIdentifier("status_bar_height","dimen","android");
if(resourceId>0){
result=getResources().getDimensionPixelSize(resourceId);
}
return result;
二、得到标题栏的高度:
int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
//statusBarHeight是上面所求的状态栏的高度
int titleBarHeight = contentTop - statusBarHeight
三、两种方式得到屏幕的高度:
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();
screenWidth = display.getWidth();
screenHeight = display.getHeight();
DisplayMetrics dm = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(dm);//this指当前activity
screenWidth =dm.widthPixels;
screenHeight =dm.heightPixels
补充使得屏幕横屏的代码:
setRequesteOrientation(ActivityInfo.SCREEN_ORIENTATION_LADSCAPE);
四:获取控件的宽高,一般来说,我们在onCreate里面得到的控件的宽高全是0.采用下面的方法,可以得到真实的宽高
//------------------------------------------------方法一
int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
imageView.measure(w, h);
int height =imageView.getMeasuredHeight();
int width =imageView.getMeasuredWidth();
textView.append("\n"+height+","+width);
此方法会加载onMeasure三次
//-----------------------------------------------方法二
ViewTreeObserver vto = imageView.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
int height = imageView.getMeasuredHeight();
int width = imageView.getMeasuredWidth();
textView.append("\n"+height+","+width);
return true;
}
});
此方法会加载onMeasure二次,但是回调函数会回调很多次
//-----------------------------------------------方法三
ViewTreeObserver vto2 = imageView.getViewTreeObserver();
vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth());
}
});