Question

我有：

popUp.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="fill_parent"

            ....
    <Button
        android:id="@+id/ok_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ok" 
        android:gravity="left"
        />
</LinearLayout>

main.java

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ListView listView = (ListView)findViewById(R.id.list);
    listView.setOnItemClickListener(new OnItemClickListener()
                {
                public void onItemClick(AdapterView<?> parent, View v,
                int position, long id)
                {
                    popUp();    

                }
       });

我强行关闭

public void popUp(){
            LayoutInflater inflater = (LayoutInflater) project.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            final PopupWindow pw = new PopupWindow(inflater.inflate(R.layout.popup,null, false),300,400,true);
            ok_button = (Button) findViewById(R.id.ok_button);
            pw.showAtLocation(findViewById(R.id.list), Gravity.BOTTOM, 0,10);
            ok_button.setOnClickListener(new OnClickListener() { //here I get FC
                @Override
               public void onClick(View v) {

                 pw.dismiss();

              }
    });
        }


    }

当我从main.xml而不是popUp.xml使用按钮（在popUp（）;中）时，一切正常。使用非main.xml中的按钮有什么问题

Answer 1

我认为问题在于：

ok_button = (Button) findViewById(R.id.ok_button);

它正在寻找主要布局内的按钮视图，而不是在弹出布局中查找。所以ok_button可能是null。

尝试从构造函数中移出inflate调用，如下所示：

View v = inflater.inflate(R.layout.popup,null, false);
final PopupWindow pw = new PopupWindow(v,300,400,true);

然后：

ok_button = (Button) v.findViewById(R.id.ok_button);

Android：popUp和按钮解雇不起作用

1 个答案: