如何在应用中的所有活动中显示单个旋转器

Question

我正在创建旋转对话框，以关闭并重新启动我在键盘上显示的。问题是我不想在每个活动上创建旋转器。那么，如何在应用程序中的所有活动中调用单个旋转器呢？

           public class MainActivity extends Activity {
Spinner spinner;
 String[] strings = {"Power Options","Power off","Restart"};
  String[] subs = {"","Shut phone down","Close all apps and restart phone" };
    int arr_images[] = {R.drawable.ic_launcher, R.drawable.images1,
          R.drawable.images2};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    spinner = (Spinner)findViewById(R.id.spinner1); 
      spinner.setAdapter(new MyAdapter(this, R.layout.row, strings));


        spinner.setOnItemSelectedListener(new  AdapterView.OnItemSelectedListener() 
        { 
            public void onItemSelected(AdapterView<?> adapterView, 
           View view, int i, long l) { 
           // TODO Auto-generated method stub
                if (i == 1)
                {
                 Toast.makeText(MainActivity.this,"PowerOff 
                       Perform",Toast.LENGTH_SHORT).show();

                }

                if (i == 2)
                {

      Toast.makeText(MainActivity.this,"Reboot Perform",Toast.LENGTH_SHORT).show();
                }


             }
              // If no option selected
  public void onNothingSelected(AdapterView<?> arg0) {
   // TODO Auto-generated method stub
  } 
      });


     }

public class MyAdapter extends ArrayAdapter<String>{
      public MyAdapter(Context context, int textViewResourceId,   String[] objects) 
     {
          super(context, textViewResourceId, objects);
      }
      @Override
      public View getDropDownView(int position, View convertView,ViewGroup parent) {



          return getCustomView(position, convertView, parent);
      }
      @Override
      public View getView(int position, View convertView, ViewGroup parent) {


          return getCustomView(position, convertView, parent);
      }

      public View getCustomView(int position, View convertView, ViewGroup parent) {

          LayoutInflater inflater=getLayoutInflater();
          View row=inflater.inflate(R.layout.row, parent, false);
          TextView label=(TextView)row.findViewById(R.id.company);
          label.setText(strings[position]);
          TextView sub=(TextView)row.findViewById(R.id.sub);
          sub.setText(subs[position]);
          ImageView icon=(ImageView)row.findViewById(R.id.image);
          icon.setImageResource(arr_images[position]); 
          return row;
          }




@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
  if(KeyEvent.KEYCODE_PAGE_UP == event.getKeyCode() && isRooted()){
      spinner.performClick();


           return true;
  }
 return super.onKeyDown(keyCode, event);
}

Answer 1

创建一个名为baseeactivity的类，并将其扩展到活动。然后，您可以从baseeativitive类创建活动并在其中添加对话框。

编辑：

public class BaseActivity extends Activity {
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return super.onKeyDown(keyCode, event);
    }
}

，您的主要活性将扩展碱性。