Question

我正在开发一个Android应用程序，它使用Fragment和listView在HomeActivity上生成两个列表，并且还可以自定义使用NavigationViewer作为菜单。

MainActivity：

public class Fragment1 extends ListFragment {
 PackageManager pm;
    ListView apList;
    int c = 1;

    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";


    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    public Fragment1() {

    }


    public static Fragment1 newInstance(String param1, String param2) {
        Fragment1 fragment = new Fragment1();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }

        apList=(ListView) getActivity().findViewById(R.id.listView);
        pm = getActivity().getPackageManager();
        List<PackageInfo> packageList = pm
                .getInstalledPackages(PackageManager.GET_PERMISSIONS);

        List<PackageInfo> packageList1 = new ArrayList<PackageInfo>();

        for (PackageInfo pi : packageList) {
            boolean b = isSystemPackage(pi);
            if (!b) {
                packageList1.add(pi);
            }

        }

        apList.setAdapter(new ApkAdapter(this, packageList1, pm, c));

    }
    private boolean isSystemPackage(PackageInfo pkgInfo) {
        if((pkgInfo.applicationInfo.flags & (ApplicationInfo.FLAG_SYSTEM|ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)) >0)
        {
            return true;
        }
        else{
            return true;
        }
 }
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_1, container, false);
    }

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {

        void onFragmentInteraction(Uri uri);
    }
}

片段1：

public class Fragment2 extends ListFragment {
    int c=0;
    String str[]= {"Wifi","Bluetooth"};

    public View onCreateView(LayoutInflater inflater, ViewGroup vg, Bundle s) {
        View view = inflater.inflate(R.layout.fragment_2, vg, false);

    List<String> l = new ArrayList<>();
    l.add("Wifi");
    l.add("Bluetooth");
    ApkAdapter ad = new ApkAdapter(this,l ,c);
    setListAdapter(ad);
    return view;
    }

    public void onCreate(Bundle s) {
        ListView l1;
        l1=(ListView)getActivity().findViewById(R.id.listView1);
        List<String> l=new ArrayList<>();
        l.add("Wifi");
        l.add("Bluetooth");
        ApkAdapter ad=new ApkAdapter(this,l,c);
        l1.setAdapter(ad);

    }
}

片段2：

public class ApkAdapter extends BaseAdapter {

    List<PackageInfo> packageList;
    List<String> s1;
    Fragment1 context;
    Fragment2 context1;
    PackageManager packageManager;
    Switch s;

    int c;
    String appName;
    String str[];
    int img[]={R.drawable.wifi,R.drawable.bluetooth};
    public ApkAdapter(Fragment1 context, List<PackageInfo> packageList,
                      PackageManager packageManager, int c) {
        super();
        this.context = context;
        this.packageList = packageList;
        this.packageManager = packageManager;
        this.c=c;
    }
    public ApkAdapter(Fragment2 context,List<String> s,int c)
    {
        super();
        this.context1=context;
        this.s1=s;
        this.c=c;
    }
    private class ViewHolder {
        TextView apkName;
        ImageView i;

    }

    public int getCount() {
        if (c == 1) {
            return packageList.size();
        }
        else if(c==0)
        {
            return str.length;
        }
        else return 0;
    }

    public Object getItem(int position) {
        if(c==1){
            return packageList.get(position);
        }
        else
            return position;
    }


    public long getItemId(int position) {
        return 0;
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder,h1;
        LayoutInflater inflater = context.getActivity().getLayoutInflater();
        LayoutInflater inflater1 = context1.getActivity().getLayoutInflater();
        ArrayList<String> ar = new ArrayList<String>();

        if (convertView == null) {
            if(c==0) {
                convertView = inflater.inflate(R.layout.apklist_item, null);
            }
            else if(c==1)
            {
                convertView = inflater1.inflate(R.layout.apklist_item, null);
            }
            holder = new ViewHolder();

            holder.apkName = (TextView) convertView.findViewById(R.id.appname);
            holder.i=(ImageView)convertView.findViewById(R.id.imageView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
try{
        if(c==0) {
            int j = 0;
            while (j < 2) {
                int ser=(Integer) getItem(position);
                appName=s1.get(ser);
                Drawable dr = context.getResources().getDrawable(img[j]);
                dr.setBounds(0,0,10,10);
                resize(dr);
                holder.apkName.setCompoundDrawablesWithIntrinsicBounds(img[j], 0, 0, 0);
                holder.apkName.setCompoundDrawablePadding(3);
                holder.apkName.setText("\n" + "  " + appName);
                j++;
            }
        }
        else if(c==1) {
            PackageInfo packageInfo = (PackageInfo) getItem(position);
            Drawable appIcon = packageManager
                    .getApplicationIcon(packageInfo.applicationInfo);
            appName = packageManager.getApplicationLabel(
                    packageInfo.applicationInfo).toString();
            appIcon.setBounds(0, 0, 100, 100);
            holder.apkName.setCompoundDrawables(appIcon, null, null, null);
            holder.apkName.setCompoundDrawablePadding(25);
            holder.apkName.setText("\n" + "  " + appName);
        }
    holder.i.setScaleY(0.5f);
         holder.i.setImageResource(R.drawable.images);
     }
     catch(Exception e) {
         e.printStackTrace();
     }
        return convertView;
    }
    public Drawable resize(Drawable i)
    {
        Bitmap b=((BitmapDrawable)i).getBitmap();
        Bitmap br=Bitmap.createScaledBitmap(b,10,10,false);
        return new BitmapDrawable(Resources.getSystem(),br);
    }
}

ApkAdapter：

getPackageInfo()

还有一个AppData类具有setPackageInfo()和<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:openDrawer="start"> <include layout="@layout/app_bar_main" android:layout_width="match_parent" android:layout_height="match_parent" /> <android.support.design.widget.NavigationView android:id="@+id/nav_view" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="start" android:fitsSystemWindows="true" app:headerLayout="@layout/nav_header_main" app:menu="@menu/activity_main_drawer" /> </android.support.v4.widget.DrawerLayout>方法。

activity_main.xml中：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">

    <fragment
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/fragment_2"
        android:name="com.example.sardwal.applock.Fragment2"
        tools:layout="@layout/fragment_2" />
    <fragment
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:id="@+id/fragment_1"
        android:name="com.example.sardwal.applock.Fragment1"
        tools:layout="@layout/fragment_1"
        android:layout_marginTop="30dp" />
</LinearLayout>

content_main.xml：

FATAL EXCEPTION: main
                                                   Process: com.example.sardwal.applock, PID: 21919
                                                   java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sardwal.applock/com.example.sardwal.applock.MainActivity}: android.view.InflateException: Binary XML file line #11: Binary XML file line #9: Error inflating class fragment
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2584)
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2666)
                                                       at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493)
                                                       at android.os.Handler.dispatchMessage(Handler.java:111)
                                                       at android.os.Looper.loop(Looper.java:207)
                                                       at android.app.ActivityThread.main(ActivityThread.java:5769)
                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
                                                    Caused by: android.view.InflateException: Binary XML file line #11: Binary XML file line #9: Error inflating class fragment
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
                                                       at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:267)
                                                       at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:129)
                                                       at com.example.sardwal.applock.MainActivity.onCreate(MainActivity.java:44)
                                                       at android.app.Activity.performCreate(Activity.java:6583)
                                                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1114)
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2531)
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2666) 
                                                       at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493) 
                                                       at android.os.Handler.dispatchMessage(Handler.java:111) 
                                                       at android.os.Looper.loop(Looper.java:207) 
                                                       at android.app.ActivityThread.main(ActivityThread.java:5769) 
                                                       at java.lang.reflect.Method.invoke(Native Method) 
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
                                                    Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
                                                       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
                                                       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
                                                       at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
                                                       at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                       at android.view.LayoutInflater.parseInclude(LayoutInflater.java:971)
                                                       at android.view.LayoutInflater.rInflate(LayoutInflater.java:831)
                                                       at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                       at android.view.LayoutInflater.parseInclude(LayoutInflater.java:971)
                                                       at android.view.LayoutInflater.rInflate(LayoutInflater.java:831)
                                                       at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
                                                       at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
                                                       at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:267) 
                                                       at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:129) 
                                                       at com.example.sardwal.applock.MainActivity.onCreate(MainActivity.java:44) 
                                                       at android.app.Activity.performCreate(Activity.java:6583) 
                                                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1114) 
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2531) 
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2666) 
                                                       at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493) 
                                                       at android.os.Handler.dispatchMessage(Handler.java:111) 
                                                       at android.os.Looper.loop(Looper.java:207) 
                                                       at android.app.ActivityThread.main(ActivityThread.java:5769) 
                                                       at java.lang.reflect.Method.invoke(Native Method) 
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)

fragment_1.xml和fragment_2.xml有listView和TextView，而前者使用的是frameLayout，后者使用的是linear.Both的id标签设置为android：idlist

apklist_item.xml：它有一个textview和ImageView。由于字数限制，无法放置他们的代码。我想它不会有任何区别。

我在logcat中遇到以下异常，并且不知道如何解决它们：

 E/AppOnlineConfigurationUpdateTask: Get app configuration fail. Target host must not be null, or set in parameters. scheme=null, host=null, path=/reaper/server/appparams
                                                                   java.lang.IllegalStateException: Target host must not be null, or set in parameters. scheme=null, host=null, path=/reaper/server/appparams
                                                                       at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:603)
                                                                       at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:299)
                                                                       at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:601)
                                                                       at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:519)
                                                                       at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:497)
                                                                       at com.lenovo.lps.reaper.sdk.i.b.a(Unknown)
                                                                       at com.lenovo.lps.reaper.sdk.i.a.run(Unknown)
                                                                       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
                                                                       at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                                                                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                                                                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                                       at java.lang.Thread.run(Thread.java:818)

E/ConfigurationUpdateTask: Same stuff IllegalStateException 

 E/SurfaceFlinger: strok layer name=none

 E/EventReportHandler: Same stuff IllegalStateException

 E/SurfaceFlinger: strok layer name=none

 E/WifiTrafficPoller: TRAFFIC_STATS_POLL true Token 1540 num clients 10
 E/WifiTrafficPoller:  packet count Tx=1476881 Rx=1685658
 E/InputMethodManagerService: Ignoring updateSystemUiLocked due to an invalid token. uid:1000 token:null
 E/SwitchMobileDataTile: mobile data not ready or disabled
 E/InputDispatcher: channel 'f377d75  (server)' ~ Channel is unrecoverably broken and will be disposed!
 E/MountService: setDefaultPath new path=/storage/emulated/0

除此之外，最近当我在我的lenovo设备上运行相同的代码时，我在logcat上遇到以下错误错误：

{{1}}

我遇到了这些错误而没有得到如何解决它们。感谢

Answer 1

应用程序崩溃，因为您正在片段中的onCreate方法中查找列表。你应该在片段中使用这样的东西：

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { ListView l1;
    l1=(ListView)view.findViewById(R.id.listView1);
    List<String> l=new ArrayList<>();
    l.add("Wifi");
    l.add("Bluetooth");
    ApkAdapter ad=new ApkAdapter(this,l,c);
    l1.setAdapter(ad);}

这是在Fragment的onCreateView方法之后调用的，因此你将设置Fragment的布局，你将不会寻找null ListView。

Answer 2

在您的情况下，为了工作，您必须具备以下条件：片段1 xml看起来应该是这样的：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

编辑：
片段2 xml应该几乎相同：

   <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

片段的创建应该是相同的：
onCreate当然来自Activity。

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

    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    Fragment1 f1 = new Fragment1();
    Fragment2 f2 = new Fragment2();

    ft.replace(R.id.fragment_1, f1);
    ft.replace(R.id.fragment_2, f2);

    ft.commit();
}

接下来在onCreateView中你应该有类似的东西：

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup vg, Bundle s) {
        View view = inflater.inflate(R.layout.fragment_2, vg, false);

        List<String> l = new ArrayList<>();
        l.add("Wifi");
        l.add("Bluetooth");
        ApkAdapter ad = //choose whichever constructor you want.
        setListAdapter(ad);
        return view;
    }

活动布局xml应如下所示：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="1">

    <fragment
        android:id="@+id/fragment_1"
        android:name="com.example.atstanescu.myapplication.Fragment1"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        tools:layout="@layout/fragment_2" />

    <fragment
        android:id="@+id/fragment_2"
        android:name="com.example.atstanescu.myapplication.Fragment2"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_marginTop="30dp"
        tools:layout="@layout/fragment_1" />
</LinearLayout>

One additional note, your adapter looks really buggy. I needed to reduce it a lot to see some issues. For example you check for c==0 and c==1 but what happens if you have 2, 3.

将片段用于自定义列表时出现InflateException和IllegalStateException

2 个答案: