反射加载图片

转：http://wang-peng1.iteye.com/blog/566362

其实这个问题在我的以前的琐碎里已经记录过了

现在拿出来 免得到时候需要的人在找

int i=  getResources().getIdentifier("icon", "drawable", getPackageName()) ;
      if(i>0)
      {Log.i("aa","aa");}
      else
      {Log.i("vbv","aa");}

 

或者

 int resID = getResources().getIdentifier("org.loveandroid.androidtest:drawable/gallery_photo_1",null,null);

 

int resID = getResources ( ). getIdentifier ( "org.anddev.android.testproject:drawable/bug",  null,  null ); 
// or 
int resID = getResources ( ). getIdentifier ( "bug",  "drawable",  "org.anddev.android.testproject" );

第一个参数其实

full_package:type/filename_without_ending是这种格式 然后其他的可以为null

Java代码   

int idFlag = getResources().getIdentifier( getPackageName() + ":drawable/flag", null, null); // 或是 int idFlag = getResources().getIdentifier( "flag", "drawable", getPackageName());  

 

Java代码   

var Drawable[] dw = new Drawable[10]; for (int i = 1; i <= 10; i++) { int id = getResources().getIdentifier( "flag" + i, "drawable", getPackageName()); dw[i-1] = getResources().getDrawable(id); }  

 用反射发 可以得到 所有的资源

Java代码   

private void _DumpAllResourceIDs(Class<?> classType) throws IllegalArgumentException { Field[] fIDs = classType.getFields(); try { for (int i = 0; i < fIDs.length; i++) { Field fld = fIDs[i]; int nID = fld.getInt(null); Log.d("dbg", classType.getSimpleName() + " " + i + ": " + fld.getName() + "=" + nID); } } catch (Exception e) { throw new IllegalArgumentException(); } }  

 

Java代码   

import java.lang.reflect.Field; ... _DumpAllResourceIDs(R.layout.class); _DumpAllResourceIDs(R.drawable.class);   

 结果

Java代码   

R$layout 0: main=2130903040 R$layout 1: small_spinner_dropdown_item=2130903041 R$drawable 0: icon=2130837504