Question

我的代码不断崩溃，并不是很确定我到底出了什么问题，我所知道的是arraylist的调用者没有收到它，我觉得它与适配器有关。 android studio中也不例外，因为它可以让应用程序运行并打开崩溃。这是调试器所说的。该应用程序将运行，直到该应用程序崩溃后该数组列表中的返回行。

 E/e.reportcardap: Invalid ID 0x00000041.
 D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.reportcardapp, PID: 8949
android.content.res.Resources$NotFoundException: String resource ID #0x41
    at android.content.res.Resources.getText(Resources.java:348)
    at android.widget.TextView.setText(TextView.java:5858)
    at com.example.reportcardapp.ReportCardAdapter.getView(ReportCardAdapter.java:45)
    at android.widget.AbsListView.obtainView(AbsListView.java:2373)
    at android.widget.ListView.makeAndAddView(ListView.java:2052)
    at android.widget.ListView.fillDown(ListView.java:786)
    at android.widget.ListView.fillFromTop(ListView.java:847)
    at android.widget.ListView.layoutChildren(ListView.java:1826)
    at android.widget.AbsListView.onLayout(AbsListView.java:2165)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:444)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
    at com.android.internal.policy.DecorView.onLayout(DecorView.java:792)
    at android.view.View.layout(View.java:20713)
    at android.view.ViewGroup.layout(ViewGroup.java:6197)
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2831)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2358)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1494)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7288)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
    at android.view.Choreographer.doCallbacks(Choreographer.java:761)
    at android.view.Choreographer.doFrame(Choreographer.java:696)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6936)
    at java.lang.reflect.Method.invoke(Native Method)
    at     com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:870)

//主要活动//

package com.example.reportcardapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.grade_list);


    ArrayList<Grade> grades = new ArrayList<Grade>();


    grades.add(new Grade("Name: Jake;", "Math;", 'A'));
    grades.add(new Grade("Name: Jake;", "Science", 'C'));
    grades.add(new Grade("Name: Jake;", "Gym", 'B'));
    grades.add(new Grade("Name: Jake;", "Web Design", 'c'));
    grades.add(new Grade("Name: Jake;", "Music", 'F'));

    ReportCardAdapter aadapter = new ReportCardAdapter(this, grades);

    // Find the {@link ListView} object in the view hierarchy of the {@link Activity}.
    // There should be a {@link ListView} with the view ID called list, which is declared in the
    // word_list.xml layout file.
    ListView listView = (ListView) findViewById(R.id.list);

    // Make the {@link ListView} use the {@link WordAdapter} we created above, so that the
    // {@link ListView} will display list items for each {@link Word} in the list.
    listView.setAdapter(aadapter);

}

}

//年级包com.example.reportcardapp;

public class Grade {
private String mname;
private String mclassName;
private char mgradeLetter;


public Grade(String name, String className, char gradeLetter) {
    mname = name;
    mclassName = className;
    mgradeLetter = gradeLetter;
}

public String getName() {
    return mname;
}

public String getClassName() {
    return mclassName;
}

public char getGradeLetter() {
    return mgradeLetter;
}
}

//报告卡适配器//

package com.example.reportcardapp;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;


import java.util.ArrayList;


 public class ReportCardAdapter extends ArrayAdapter<Grade> {


public ReportCardAdapter(Context context, ArrayList<Grade> grades) {
    super(context, 0, grades);
}

@Override
public View getView(int position, View convertView, ViewGroup parent)        {
    // Check if an existing view is being reused, otherwise inflate   the view
    View listItemView = convertView;
    if (listItemView == null) {
        listItemView = LayoutInflater.from(getContext()).inflate(
                R.layout.list_item, parent, false);
    }

    // Get the {@link Word} object located at this position in the   list
    Grade currentGrade = getItem(position);


    TextView nameTextView = listItemView.findViewById(R.id.name);
    nameTextView.setText(currentGrade.getName());


    TextView classNameTextView = listItemView.findViewById(R.id.className);
    classNameTextView.setText(currentGrade.getClassName());


    TextView gradeLetterTextView = listItemView.findViewById(R.id.letterGrade);
    gradeLetterTextView.setText(currentGrade.getGradeLetter());
    return listItemView;
}
}

Answer 1

看起来像R.id.name不存在。检查您的strings.xml文件

我的自定义数组列表每次启动时都会崩溃，因此不确定为什么会一直崩溃

1 个答案: