[英]What does String.valueOf(View) returns?
I was using some Logs to debug some issues in my app, and when I used String.valueOf(view)
in a onClick(View view)
. 当我在onClick(View view)
使用String.valueOf(view)
时,我正在使用一些Logs调试应用程序中的某些问题。
I logged Log.d("Values", "HomeFragment: onClick. view = " + String.valueOf(view));
我记录了Log.d("Values", "HomeFragment: onClick. view = " + String.valueOf(view));
The result of the Log was: D/Values: HomeFragment: onClick. view = android.widget.RelativeLayout{cca8bb VE..C.. ...P.... 0,512-1080,1024 #7f0c0079 app:id/button_2}
日志的结果是: D/Values: HomeFragment: onClick. view = android.widget.RelativeLayout{cca8bb VE..C.. ...P.... 0,512-1080,1024 #7f0c0079 app:id/button_2}
D/Values: HomeFragment: onClick. view = android.widget.RelativeLayout{cca8bb VE..C.. ...P.... 0,512-1080,1024 #7f0c0079 app:id/button_2}
I would like to know what that means. 我想知道那是什么意思。 I have been trying to get the information from the Android Developers reference , but the closest was the deffinition of valueOf (Object value)
that is too generic. 我一直在尝试从Android开发者参考中获取信息,但最接近的是太普通的valueOf (Object value)
。
Where should I go to get the information returned for a specific object by String.valueOf()
? 我应该去哪里获取String.valueOf()
为特定对象返回的信息?
String.valueOf(object)
just calls the toString
method of the object. String.valueOf(object)
只是调用String.valueOf(object)
的toString
方法。 If you decompile the View
class, you get: 如果反编译View
类,则会得到:
// toString method of the View class
public String toString() {
StringBuilder out = new StringBuilder(128);
out.append(getClass().getName());
out.append('{');
out.append(Integer.toHexString(System.identityHashCode(this)));
out.append(' ');
switch (mViewFlags&VISIBILITY_MASK) {
case VISIBLE: out.append('V'); break;
case INVISIBLE: out.append('I'); break;
case GONE: out.append('G'); break;
default: out.append('.'); break;
}
out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.');
out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.');
out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D');
out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.');
out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.');
out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.');
out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.');
out.append((mViewFlags&CONTEXT_CLICKABLE) != 0 ? 'X' : '.');
out.append(' ');
out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.');
out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.');
out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.');
if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) {
out.append('p');
} else {
out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.');
}
out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.');
out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.');
out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.');
out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.');
out.append(' ');
out.append(mLeft);
out.append(',');
out.append(mTop);
out.append('-');
out.append(mRight);
out.append(',');
out.append(mBottom);
final int id = getId();
if (id != NO_ID) {
out.append(" #");
out.append(Integer.toHexString(id));
final Resources r = mResources;
if (Resources.resourceHasPackage(id) && r != null) {
try {
String pkgname;
switch (id&0xff000000) {
case 0x7f000000:
pkgname="app";
break;
case 0x01000000:
pkgname="android";
break;
default:
pkgname = r.getResourcePackageName(id);
break;
}
String typename = r.getResourceTypeName(id);
String entryname = r.getResourceEntryName(id);
out.append(" ");
out.append(pkgname);
out.append(":");
out.append(typename);
out.append("/");
out.append(entryname);
} catch (Resources.NotFoundException e) {
}
}
}
out.append("}");
return out.toString();
}
So, in your example: 因此,在您的示例中:
android.widget.RelativeLayout
= class name android.widget.RelativeLayout
=类名 cca8bb
= identity hashcode (in hex) cca8bb
=身份哈希码(十六进制) VE..C.. ...P....
= View is visible, mask enabled, clickable, button pressed VE..C.. ...P....
=视图可见,启用遮罩,可单击,按下按钮 0,512-1080,1024
= left, top - right, bottom distancs in pixels from the edges of this view's parent to the edges of this view. 0,512-1080,1024
=从该视图的父视图的边缘到该视图的边缘的像素上下左右偏移。 #7f0c0079
= id of the view, in hex #7f0c0079
=视图的ID,以十六进制表示 app:id/button_2
= the string id of this view (in your layout file) app:id/button_2
=此视图的字符串ID(在布局文件中)
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