Question

我是android开发的初学者我正在使用parse.com从服务器和列表视图中检索数据，以在活动主页中显示数据。
但是，当我打开我的应用程序时，它会崩溃。

我已正确初始化所有内容，但仍然以某种方式无效。
出于安全原因，我已从此代码中删除了parse.initialize(keys)。

package com.example.sangram.nearbyapp;

import android.app.Activity;
import android.app.ListActivity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

import com.parse.FindCallback;

import com.parse.Parse;
import com.parse.ParseException;

import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseUser;

import java.util.List;


public class HomepageActivity extends ListActivity {
    protected List<ParseObject> mprofessional;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_homepage);

        ParseUser currentUser = ParseUser.getCurrentUser();
        if(currentUser!=null)
        {
            //show user homepage
            ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Professionals");
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(List<ParseObject> professional, ParseException e) {
                    if(e==null)
                    {
                        //success
                        mprofessional = professional;
                        ProfessionalAdaptor adaptor = new ProfessionalAdaptor(getListView().getContext(),mprofessional);
                        setListAdapter(adaptor);
                    }
                    else
                    {
                        //there is a problem
                    }
                }
            });
        }
        else
        {    
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

professionaladapter.java

package com.example.sangram.nearbyapp;

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 com.parse.Parse;
import com.parse.ParseObject;

import java.util.List;

/**
 * Created by SANGRAM on 12/04/2015.
 */
public class ProfessionalAdaptor extends ArrayAdapter <ParseObject> {
    protected Context mcontext;
    protected List<ParseObject> mProfessionals;

    public ProfessionalAdaptor(Context context, List<ParseObject> professionals )
    {
        super(context, R.layout.homepagecustomlayout, professionals );
        mcontext= context;
        mProfessionals=professionals;
    }

    public View getView(final  int position, View convertView, ViewGroup parent)
    {
        ViewHolder holder;
        if(convertView==null)
        {
            convertView = LayoutInflater.from(mcontext).inflate(R.layout.homepagecustomlayout, null);
            holder = new ViewHolder();
            holder.namehomepage = (TextView) convertView.findViewById(R.id.userhp);
            holder.prohomepage = (TextView) convertView.findViewById(R.id.prohp);
            convertView.setTag(holder);
        }
        else
        {
            holder = (ViewHolder) convertView.getTag();
        }

        ParseObject statusObject =  mProfessionals.get(position);
        String pname = statusObject.getString("Name");
        holder.namehomepage.setText(pname);

        String ppro = statusObject.getString("Profession");
        holder.prohomepage.setText(ppro);
        return  convertView;
    }

    public static class ViewHolder
    {
        TextView namehomepage; // name of professional from parse database
        TextView prohomepage; // name of profession from parse
    }
}

清单

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.example.sangram.nearbyapp" >

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".HomepageActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".RegisterActivity"
            android:label="@string/title_activity_login" >
        </activity>
        <activity
            android:name=".LoginActivity"
            android:label="@string/title_activity_login" >
        </activity>

    </application>

</manifest>

logcat的

04-15 12：52：22.287 1784-1784 / com.example.sangram.nearbyapp E / ResourceType：样式包含输入错误的键：0x01010479 04-15 12：52：32.707 1784-1784 / com.example.sangram.nearbyapp E / ResourceType：样式包含带有错误条目的键：0x01010479 04-15 12：52：32.757 1784-1784 / com.example.sangram.nearbyapp E / AndroidRuntime：FATAL EXCEPTION：main java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.sangram.nearbyapp / com.example.sangram.nearbyapp.HomepageActivity}：java.lang.RuntimeException：您的内容必须具有其属性为“android”的ListView。 R.id.list” 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2180）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2230）在android.app.ActivityThread.access $ 600（ActivityThread.java:141）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1234）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:137）在android.app.ActivityThread.main（ActivityThread.java:5039） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:511）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:793）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:560） at dalvik.system.NativeStart.main（Native Method）引起：java.lang.RuntimeException：您的内容必须具有一个ListView，其id属性为'android.R.id.list' 在android.app.ListActivity.onContentChanged（ListActivity.java:243）在com.android.internal.policy.impl.PhoneWindow.setContentView（PhoneWindow.java:273）在android.app.Activity.setContentView（Activity.java:1881）在com.example.sangram.nearbyapp.HomepageActivity.onCreate（HomepageActivity.java:26）在android.app.Activity.performCreate（Activity.java:5104）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1080）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2144）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2230）在android.app.ActivityThread.access $ 600（ActivityThread.java:141）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1234）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:137）在android.app.ActivityThread.main（ActivityThread.java:5039） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:511）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:793）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:560） at dalvik.system.NativeStart.main（Native Method） 04-15 12：53：18.019 1865-1865 / com.example.sangram.nearbyapp E / ResourceType：样式包含带有错误条目的键：0x01010479

Answer 1

检查您的activity_homepage.xml布局。由于您使用ListActivity，因此它必须具有ID为list的ListView。

但是不要在id之前添加+，列表视图应该有这个id：

    android:id="@android:id/list"

当我打开应用程序时，我的Android应用程序崩溃（不幸的是应用已经停止）

1 个答案: