你好，我尝试使用自定义数组适配器设置旋转器的值，使用从web服务加载数据的webservices。
这是我的mainactivity，我调用并填充旋转器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_newsfeed);
txtdesc = (EditText) findViewById(R.id.txtdesc);
StrictMode.ThreadPolicy policy =
new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
categorySpinner = (Spinner) findViewById(R.id.category);
new getServices().execute();
}
这是我在textview上设置文本的适配器。
公共类Post_Service_Adapter扩展ArrayAdapter {
Context context;
public Post_Service_Adapter(Context context, int resource, List<post_service_entity> objects) {
super(context, resource, objects);
this.context = context;
}
private class ViewHolder {
TextView sid;
TextView sname;
TextView sdesc;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
post_service_entity chat = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.spinner_items,
null,false);
holder = new ViewHolder();
holder.sid = (TextView) convertView.findViewById(R.id.ser_id);
holder.sname = (TextView) convertView.findViewById(R.id.ser_name);
holder.sdesc = (TextView) convertView
.findViewById(R.id.ser_desc);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.sid.setText(chat.getServiceid());
holder.sname.setText(chat.getServicename());
holder.sdesc.setText(chat.getServicedetail());
return convertView;
}
}
这是我的spinner xml文件，我只是想显示名称。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/ser_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone" />
<TextView
android:id="@+id/ser_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="left"
android:padding="5dip"
android:textColor="@color/accentcolor"
android:textSize="15sp" />
<TextView
android:id="@+id/ser_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone" />
</LinearLayout>
这是我的服务，从web加载数据。我正在尝试使用此服务设置旋转器上的数据。
private class getServices extends AsyncTask<String, Void, String> {
ProgressDialog mProgressDialog;
@Override
protected void onPreExecute() {
res = null;
mProgressDialog = ProgressDialog.show(
Create_NewsFeed.this, "",
"Loading...");
mProgressDialog.setCancelable(true);
}
@Override
protected String doInBackground(String... params) {
PutUtility objClient = new PutUtility();
try {
res = objClient.getData("");
} catch (Exception e) {
Toast.makeText(Create_NewsFeed.this, String.valueOf(e.getMessage()), Toast.LENGTH_SHORT).show();
}
return res;
}
@Override
protected void onPostExecute(String ress) {
try {
if (ress == null) {
mProgressDialog.dismiss();
}
JSONArray jArray = new JSONArray(ress.toString());
if (jArray.length() == 0) {
mProgressDialog.dismiss();
} else {
Services = new ArrayList<post_service_entity>();
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
post_service_entity service = new post_service_entity();
service.setServiceid(json.getString("id"));
service.setServicename(json.getString("name"));
service.setServicedetail(json.getString("detail"));
Services.add(service);
}
post_service_adapter = new Post_Service_Adapter(getApplicationContext(), R.layout.spinner_items, Services);
/*categoryAdapter.setDropDownViewResource
(android.R.layout.simple_spinner_dropdown_item);*/
categorySpinner.setAdapter(post_service_adapter);
// post_service_adapter.notifyDataSetChanged();
}
mProgressDialog.dismiss();
} catch (Exception objEx) {
objEx.printStackTrace();
}
}
}
这是我的错误日志。
10-12 18:26:22.358 14556-14556/fourever.textile E/ArrayAdapter﹕ You must supply a resource ID for a TextView
10-12 18:26:22.359 14556-14556/fourever.textile D/AndroidRuntime﹕ Shutting down VM
10-12 18:26:22.359 14556-14556/fourever.textile W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40d479a8)
10-12 18:26:22.375 14556-14563/fourever.textile D/jdwp﹕ processIncoming
10-12 18:26:22.375 14556-14563/fourever.textile D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x400000E1, flags=0x0, dataLen=0x9
10-12 18:26:22.376 14556-14563/fourever.textile D/jdwp﹕ sendBufferedRequest : len=0x34
10-12 18:26:22.376 14556-14556/fourever.textile E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)
at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:193)
at android.widget.Spinner.onMeasure(Spinner.java:439)
at android.support.v7.widget.AppCompatSpinner.onMeasure(AppCompatSpinner.java:410)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1411)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:698)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15635)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1220)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.widget.ScrollView.onMeasure(ScrollView.java:321)
at android.view.View.measure(View.java:15635)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15635)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:393)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1411)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:698)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15635)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4919)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2200)
at android.view.View.measure(View.java:15635)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2165)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1249)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1443)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4872)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
at android.view.Choreographer.doCallbacks(Choreographer.java:579)
at android.view.Choreographer.doFrame(Choreographer.java:548)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
at android.os.Handler.handleCallback(Handler.java:800)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5410)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
at
首先，注意错误日志的第一行。
10-12 18:26:22.358 14556-14556/fourever.textile E/ArrayAdapter﹕ You must supply a resource ID for a TextView
查看你的代码:
post_service_adapter = new Post_Service_Adapter(getApplicationContext(), R.layout.spinner_items, Services);
查看ArrayAdapter.java的源代码
/**
* Constructor
*
* @param context The current context.
* @param textViewResourceId The resource ID for a layout file containing a TextView to use when
* instantiating views.
* @param objects The objects to represent in the ListView.
*/
public ArrayAdapter(Context context, int textViewResourceId, List<T> objects) {
init(context, textViewResourceId, 0, objects);
}
你必须传递一个包含单个TextView的textViewResourceId作为第二个参数，但是你传递了一个包含多个TextView的布局资源R.layout.spinner_items
Android官方文档:http://developer.android.com/reference/android/widget/ArrayAdapter.html
一个由任意数组支持的具体BaseAdapter对象。默认情况下，该类期望提供的资源id引用单个TextView。如果你想用一个更复杂的布局时，使用也接受字段id的构造函数。这个字段id应该在更大的布局资源中引用TextView。
然而，TextView被引用，它将被填充数组中每个对象的toString()。的列表或数组自定义对象。重写对象的toString()方法确定列表中的项目将显示什么文本。
使用textview以外的东西来显示数组，for实例，ImageViews，或者有一些数据除了toString()结果填充视图，重写getView(int, View, ViewGroup)到返回你想要的视图类型。
看ArrayAdapter.java的代码:
private View createViewFromResource(int position, View convertView, ViewGroup parent,
int resource) {
View view;
TextView text;
if (convertView == null) {
view = mInflater.inflate(resource, parent, false);
} else {
view = convertView;
}
try {
if (mFieldId == 0) {
// If no custom field is assigned, assume the whole resource is a TextView
text = (TextView) view;
} else {
// Otherwise, find the TextView field within the layout
text = (TextView) view.findViewById(mFieldId);
}
} catch (ClassCastException e) {
Log.e("ArrayAdapter", "You must supply a resource ID for a TextView");
throw new IllegalStateException(
"ArrayAdapter requires the resource ID to be a TextView", e);
}
T item = getItem(position);
if (item instanceof CharSequence) {
text.setText((CharSequence)item);
} else {
text.setText(item.toString());
}
return view;
}