[英]Populate Json to Spinner in Android
我正在嘗試將JSON填充到微調框,但是失敗了。 錯誤始終指向KatArtcAdapter- > getView,而致命錯誤始終顯示ArrayAdapter要求資源ID為TextView。 你能幫我發現我的錯誤嗎? 謝謝高級
KatArtcAdapter.java
public class KatArtcAdapter extends ArrayAdapter<KategoriArt> {
private Activity context;
ArrayList<KategoriArt> data = null;
public KatArtcAdapter(Activity context, int resource,ArrayList<KategoriArt> data) {
super(context, resource, data);
this.context = context;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
return super.getView(position, convertView, parent);
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = context.getLayoutInflater();
row = inflater.inflate(R.layout.spinner_item, parent, false);
}
KategoriArt item = data.get(position);
if (item != null) { // Parse the data from each object and set it.
TextView KatId = (TextView) row.findViewById(R.id.item_id);
TextView KatName = (TextView) row.findViewById(R.id.item_value);
if (KatId != null) {
KatId.setText(item.getIdKat());
}
if (KatName != null) {
KatName.setText(item.getName());
}
}
return row;
}
}
MainActivity.Java
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener,
RecyclerItemClickListener.OnItemClickListener{
artikelAdapter mGridadapter;
JSONParser jParser= new JSONParser();
JSONArray names=null;
private static final String URL_READ_KAT= "http://amobipets.azurewebsites.net/readKategoriArticle.php";
private static final String TAG_PESAN = "message";
private static final String TAG_HASIL = "result";
private static final String TAG_ID_KAT = "id";
private static final String TAG_KAT= "kategori";
Spinner katyField;
ArrayList<KategoriArt> katList = new ArrayList<KategoriArt>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
katyField =(Spinner) findViewById(R.id.spinner);
new buildKatDropDown().execute();
katyField.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
KategoriArt selectedKat=katList.get(position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public class buildKatDropDown extends AsyncTask<String,String,String> {
int sukses=0;
public buildKatDropDown() {
}
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
try
{
JSONObject json = jParser.makeHttpRequest(URL_READ_KAT, "GET", params);
if(json != null)
{
sukses = json.getInt(TAG_PESAN);
if(sukses == 1)
{
nameList = new ArrayList<HashMap<String,String>>();
Log.d("Semua Nama: ", json.toString());
names = json.getJSONArray(TAG_HASIL);
for(int i = 0; i < names.length();i++)
{
JSONObject c = names.getJSONObject(i);
String id = c.getString(TAG_ID_KAT);
String kategori = c.getString(TAG_KAT);
katList.add(new KategoriArt(id,kategori));
}
}
}
}catch(JSONException e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String s) {
if(sukses==1)
{
KatArtcAdapter ktAdapter=new KatArtcAdapter(MainActivity.this,R.layout.spinner_item,katList);
katyField.setAdapter(ktAdapter);
}
}
}
}
堆棧跟蹤
06-19 19:26:44.328 21749-21904 / com.amobi.newlomapodfix D / url: http ://amobipets.azurewebsites.net/readKategoriArticle.php嗎? 06-19 21:26:44.375 21749-21867 / com.amobi.newlomapodfix E /曲面:getSlotFromBufferLocked:未知緩沖區:0xaaaa97d0 06-19 21:26:44.428 21749-21749 / com.amobi.newlomapodfix W /設置:設置plane_mode_on已從android.provider.Settings.System移至android.provider.Settings.Global,返回只讀值。 06-19 21:26:44.493 21749-21904 / com.amobi.newlomapodfix I / info:org.apache.http.client.methods.HttpGet@b2b1a82 06-19 21:26:44.494 21749-21904 / com.amobi。 newlomapodfix D / Semua Nama :: {“結果”:[{“ id”:“ 11”,“ kategori”:“安井”},{“ id”:“ 21”,“ kategori”:“ Kucing”},{ “ id”:“ 31”,“ kategori”:“倉鼠”},{“ id”:“ 41”,“ kategori”:“ Reptil”}],“消息”:1} 06-19 21:26:44.704 21749-21749 / com.amobi.newlomapodfix E / ArrayAdapter:您必須提供TextView的資源ID 06-19 21:26:44.709 21749-21749 / com.amobi.newlomapodfix D / AndroidRuntime:關閉VM 06-19 21 :26:44.728 21749-21749 / com.amobi.newlomapodfix E / AndroidRuntime:致命例外:主進程:com.amobi.newlomapodfix,PID:21749 java.lang.IllegalStateException:ArrayAdapter要求資源ID為android上的TextView。在android.widget.ArrayAdapter.getView(ArrayAdapter.java:369)在com.amobi.newlomapodfix.adapter.KatArtcAdapter.getView(KatArtcAdapter.java:30)在android上的widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:393)。 android.widget中的widget.AbsSpinner.onMeasure(AbsSpinner.java:194)在android.view上android.support.v7.widget.AppCompatSpinner.onMeasure(AppCompatSpinner.java:418) android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)的android.widget.FrameLayout.onMeasure(FrameLayout.java:194)的.View.measure(View.java:18788)android.view.View.measure( android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)的android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)的android.view.View.measure(View.java:18788的View.java:18788) )在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)在android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:664)在android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior。 java:90)(在Android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1149)在androi) d.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:729)在android.view.View.measure(View.java:18788)在android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java: 1075),位於android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951),位於android.widget.FrameLayout.onMeasure(FrameLayout.java:194),位於android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)。在android.view.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)在android.view.View.measure(View.java:18788)在support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) android.widget處的.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465).android.widget.LinearLayout.measureVertical(LinearLayout.java:748)android.widget.LinearLayout.onMeasure(LinearLayout.java:630)android.view.View.measure( android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)位於android.widget.FrameLayout.onMeasure(FrameLayout.java:194)位於android.view.View.m處的View.java:18788) easure(View.java:18788)位於android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)位於android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)位於android.widget.LinearLayout.measureVertical(LinearLayout.java) :748)在android.widget.LinearLayout.onMeasure(LinearLayout.java:630)在android.view.View.measure(View.java:18788)在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)在android .widget.FrameLayout.onMeasure(FrameLayout.java:194)位於com.android.internal.policy.PhoneWindow $ DecorView.onMeasure(PhoneWindow.java:2643)位於android.view.View.measure(View.java:18788) android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)at android.view.ViewRootImpl .doTraversal(ViewRootImpl.java:1107)在android.view.ViewRootImpl $ TraversalRunnable.run(ViewRootImpl.java:6013)在android.view.Choreographer $ C android.view.Choreographer.doCallbacks(Choreographer.java:670:all)的allbackRecord.run(Choreographer.java:670)android.view.Choreographer $ FrameDisplayEventReceiver.run的android.view.Choreographer.doFrame(Choreographer.java:606) (Choreographer.java:844)在android.os.Handler.handleCallback(Handler.java:739)在android.os.Handler.dispatchMessage(Handler.java:95)在android.os.Looper.loop(Looper.java: 148),位於android.app.ActivityThread.main(ActivityThread.java:5417),位於java.lang.reflect.Method.invoke(本機方法),位於com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java: 726)
編輯
Spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1">
<TextView
android:id="@+id/item_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.43">
</TextView>
<TextView
android:id="@+id/item_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFFFFF"
android:layout_weight="0.10">
</TextView>
</LinearLayout>
正如您在評論中提到的那樣,即使只有一個TextView,它仍然在提高,然后您可以使用具有4個參數的constructor
函數和textViewResourceId
如下所示:
ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects)
不會有太大的變化,但是您的代碼看起來像這樣,
public KatArtcAdapter(Activity context, int resource,int textViewResourceId, ArrayList<KategoriArt> data) {
....
}
請參閱文檔以獲取更多信息,如果仍然出現錯誤,請嘗試不要在TextView
使用其他布局。
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