android – 如何使用微调

概述我很新的 android.我想在我的应用程序中使用2个旋转器,一个显示国家列表,当选择任何国家时,其他微调器应该显示该国家/地区的城市列表.当选择城市时,执行一些动作. plz帮我一些示例代码.感谢预期 这里是我们可以用来添加spinner2 w.r.t到spinner 1的选项的东西. public class Activity extends Activity implements View. 我很新的 android.我想在我的应用程序中使用2个旋转器,一个显示国家列表,当选择任何国家时,其他微调器应该显示该国家/地区的城市列表.当选择城市时,执行一些动作. plz帮我一些示例代码.感谢预期解决方法 这里是我们可以用来添加spinner2 w.r.t到spinner 1的选项的东西.

public class Activity extends Activity implements VIEw.OnClickListener{    private Spinner spinner0,spinner1,spinner2,spinner3;    private button submit,cancel;    private String country[],state[],city[],area[];    Australia aus = new Australia();    Object object;    /** Called when the activity is first created. */    @OverrIDe    public voID onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.main);        spinner0 = (Spinner)findVIEwByID(R.ID.spinnerCountry);        spinner1 = (Spinner)findVIEwByID(R.ID.spinnerQ1);        spinner2 = (Spinner)findVIEwByID(R.ID.spinnerQ2);        spinner3 = (Spinner)findVIEwByID(R.ID.spinnerQ3);        submit = (button)findVIEwByID(R.ID.btnsubmit);        cancel = (button)findVIEwByID(R.ID.btnCancel);        submit.setonClickListener(this);        cancel.setonClickListener(this);        country = new String[] {"Select Country","Australia","USA","UK","New Zealand","EU","Europe","China","Hong Kong","India","Malaysia","Canada","International","Asia","Africa"};        ArrayAdapter<String> adapter0 = new ArrayAdapter<String>(Activity.this,androID.R.layout.simple_spinner_item,country);        adapter0.setDropDownVIEwResource(androID.R.layout.simple_dropdown_item_1line);        spinner0.setAdapter(adapter0);        Log.i("AAA","spinner0");        spinner0.setonItemSelectedListener(new OnItemSelectedListener()        {                       @OverrIDe            public voID onItemSelected(AdapterVIEw<?> arg0,VIEw vIEw1,int pos,long ID)            {                Log.i("AAA","OnItemSelected");                int loc;                loc = pos;                switch (loc)                {                case 1:                    state = aus.getState();                    object = aus;                    Log.i("AAA","ArrayAdapter1");                                       ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(Activity.this,state);                    adapter1.setDropDownVIEwResource(androID.R.layout.simple_dropdown_item_1line);                    spinner1.setAdapter(adapter1);          Log.i("AAA","spinner1");                    break;                default:                    Log.i("AAA","default 0");                    break;                }                                           }                   @OverrIDe            public voID onnothingSelected(AdapterVIEw<?> arg1)            {                Log.i("AAA","nothing S0");            }        });       spinner1.setonItemSelectedListener(new OnItemSelectedListener()       {            @OverrIDe            public voID onItemSelected(AdapterVIEw<?> arg0,long ID)             {                Log.i("AAA","OnItemSelected S1");                int loc = pos;                switch(loc)                {                    case 1:                        Log.i("AAA","Australia");                        if(object.equals(aus))                        {                            city = aus.getType(loc);                        }                        else                        {                            break;                        }                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(Activity.this,city);                        adapter.setDropDownVIEwResource(androID.R.layout.simple_dropdown_item_1line);                        spinner2.setAdapter(adapter);           Log.i("AAA","spinner2");                        break;                    default:                            Log.i("AAA","default 1");                        break;                }            }            @OverrIDe            public voID onnothingSelected(AdapterVIEw<?> arg0)            {                Log.i("AAA","nothing S1");                          }        });        spinner2.setonItemSelectedListener(new OnItemSelectedListener()       {        @OverrIDe        public voID onItemSelected(AdapterVIEw<?> arg0,VIEw arg1,long ID)        {            int loc = pos;            switch (loc)            {            case 1:                if(object.equals(aus))                {                    area = aus.getTitle(loc);                }                ArrayAdapter<String> adapter = new ArrayAdapter<String>(Activity.this,area);                adapter.setDropDownVIEwResource(androID.R.layout.simple_dropdown_item_1line);                spinner3.setAdapter(adapter);           Log.i("","spinner3");                               break;            default:                break;            }        }        @OverrIDe        public voID onnothingSelected(AdapterVIEw<?> arg0)         {            // Todo auto-generated method stub                  }       });    }// on-create    @OverrIDe    public voID onClick(VIEw v)    {        switch (v.getID())        {        case R.ID.btnsubmit:            break;        case R.ID.btnCancel:            finish();            break;        default:            break;        }           }   }

如果你觉得这很有用,那就放弃投票,让别人可以很容易地找到一个很好的答案.

对于每个国家,你必须为它创建一个课程,只需添加州,城市&区.这样一来,它就不会变成一个单一的网格.

玩的开心.

问候,

HAPS.

总结

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