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私はアンドロイドで新しく、これをやりたいのですが問題があります。 私は任意のListViewに読み込むことができ、私はAsyncTaskでこれをやりたいだけの多くのadaperを持っています。私はAsyncTaskでこれを行うクラスを持っており、これはクラスでのListViewへの負荷データのasynctaskクラスのlistViewに設定
package com.example.mohammad.workclock;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.example.mohammad.workclock.Tbls.Projects;
import java.util.ArrayList;
import java.util.List;
public class projectAdapter extends BaseAdapter {
private Context context;
private LayoutInflater layoutInflater;
private List<Projects> listProject = new ArrayList<>();
private ListView listView;
public projectAdapter(Context context) {
this.context = context;
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return listProject.size();
}
@Override
public Object getItem(int i) {
return listProject.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
View Row = layoutInflater.inflate(R.layout.itemsproject, parent, false);
listView = (ListView) parent;
TextView Txt_Title = (TextView) Row.findViewById(R.id.txt_Title);
Projects P = (Projects) getItem(position);
Txt_Title.setText(P.getTitle());
return Row;
}
public void upDateInputData(List<Projects> listProject) {
this.listProject = listProject;
notifyDataSetChanged();
}
}
：：私がしたいとき
class loadAsyncTaskToListView extends AsyncTask<Void, Void, ArrayList<T>> {
private SQLiteDatabase db;
private Context context;
private T adapter;
private ProgressDialog progressDialog;
private String tableName;
private N object_;
public loadAsyncTaskToListView(Context context, T adapter, N object, String tableName){
this.context = context;
db = getReadableDatabase();
this.adapter = adapter;
this.tableName = tableName;
this.object_ = object;
}
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(this.context, "","در حال بارگذاری");
}
@Override
protected ArrayList doInBackground(Void... voids) {
String Query = " SELECT * FROM " + tableName;
List<N> ListTobject = new ArrayList<>();
Cursor cursor = db.rawQuery(Query, null);
if (cursor.moveToFirst())
do {
N object = this.object_;
for (Field field : listField) {
Annotation AnnotationF = field.getAnnotation(AnnotationPartialClass.field.class);
AnnotationPartialClass.field fieldAnnotation = (AnnotationPartialClass.field) AnnotationF;
field.setAccessible(true);
setvalueToobject(object, field, cursor.getString(cursor.getColumnIndex(fieldAnnotation.NameField())));
}
}
while (cursor.moveToNext());
return (ArrayList<T>) ListTobject;
}
@Override
protected void onPostExecute(ArrayList<T> inputObjects) {
((projectAdapter)adapter).upDateInputData((List<Projects>) inputObjects);
progressDialog.dismiss();
}
public <N>void setvalueToobject(N object, Field field, Object fieldValue){
field.setAccessible(true);
try {
field.set(object, fieldValue);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
は知っている私のすべてのアダプタは、このようなものですこのメソッドを使用する私の活動でこのコードを書いてください：
projectAdapter dd = new projectAdapter(this);
LV.setAdapter(dd);
// LV is my ListView
LoadToListView(LV,dd, new Projects(),"");
私はエラーリストを持っていますこれは：
08-18 13:18:28.999 26047-26163/com.example.mohammad.workclock
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.mohammad.workclock, PID: 26047
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:325)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.IllegalArgumentException: field com.example.mohammad.workclock.Tbls.Projects.ID has type int, got java.lang.String
at java.lang.reflect.Field.set(Native Method)
at com.example.mohammad.workclock.AsyncTask.WholeWorWithDb$1loadAsyncTaskToListView.setvalueToobject(WholeWorWithDb.java:383)
at com.example.mohammad.workclock.AsyncTask.WholeWorWithDb$1loadAsyncTaskToListView.doInBackground(WholeWorWithDb.java:357)
at com.example.mohammad.workclock.AsyncTask.WholeWorWithDb$1loadAsyncTaskToListView.doInBackground(WholeWorWithDb.java:306)
at android.os.AsyncTask$2.call(AsyncTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
どのように修正できますか？
私のエラーは、この行のsetvalueToobjectメソッドにあります。field.set（object、fieldValue）; – user2591714