我想在我的MainActivity中使用getWindowManager(),但我不想直接在其中编写此方法.
这是我的MainActivity代码
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String d= new DisplayMessageActivity().getWeithAndHeight(d); }
这是我的DisplayMessageActivity代码
public class DisplayMessageActivity extends Activity { @SuppressLint("NewApi") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Intent intent = getIntent(); .... .... setContentView(textView); } public String getWeithAndHeight(String url) { DisplayMetrics dm = new DisplayMetrics(); *getWindowManager().getDefaultDisplay().getMetrics(dm);* int width = dm.widthPixels; int height = dm.heightPixels; String w=new String(""+width); String h=new String(""+height); url=url+"&23=w%3A"+w+"%20h%3A"+h+"%20d%3A"; return url; } }
我的代码在getWindowManager()中断,请告诉我原因.非常感谢你.
public String getWeithAndHeight(Context context, String url) { DisplayMetrics dm = new DisplayMetrics(); ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm); //.... }
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getWindowManager() is a method of Activity class翻译自:https://stackoverflow.com/questions/18225331/how-do-i-use-getwindowmanager-by-another-java-file