java - 如何在可搜索字典示例中 putExtra()

Question

基于 Searchable Dictionary示例 我尝试将额外的数据放入不同的 Activity 中。

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

    Spinner distance = (Spinner) findViewById(R.id.distanceSpinner);
    ArrayAdapter<CharSequence> adapterDistance = ArrayAdapter.createFromResource(
                this, R.array.distance, android.R.layout.simple_spinner_item);
    adapterDistance.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    distance.setAdapter(adapterDistance);
    Intent intent = getIntent();

    if (Intent.ACTION_VIEW.equals(intent.getAction())) {         
            // handles a click on a search suggestion; launches activity to show word
         mapIntent = new Intent(this, Map.class);
         mapIntent.setData(intent.getData());         
         mapIntent.putExtra("Distance", distance.getSelectedItemPosition());
            startActivity(mapIntent);
            finish();
        }
}

在我的 map 类中，距离始终为零，因为 distance.getSelectedItemPostion() 获取初始化值。如何通过点击搜索建议来添加额外数据？谢谢

Answer 1

您必须注册距离微调器值更改的回调，并从那里调用启动 Map 类 Activity 的 Intent 。

private OnItemSelectedListener itemSelectedListener = new OnItemSelectedListener() {
  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
    if (parent.getId() == R.id.distanceSpinner) {
      mapIntent = new Intent(this, Map.class);
      mapIntent.setData(intent.getData());         
      mapIntent.putExtra("Distance", pos);
      startActivity(mapIntent);
      finish();      
    }
  }
}