Question

我正在努力学习，目前正试图通过The Big Nerd Ranch指南向我学习一些Android。但我很难理解我如何让应用程序重新排列“新片段”中的“详细视图”，将listview重叠到sidebyside视图（listview left，details right）。

我现在在网上尝试了很多不同的指南和教程，但我想我只是为了不稳定而真正弄明白了。因为所有这些都是这样或那样的结果只是最终成为零点等等。我猜测这与“书”构建它的方式与我见过的指南有关。所以希望这里有人可以给我一个提示。

下面的代码将显示和listview，当我点击一个项目时，它将用另一个基于点击的id显示该项目的片段替换列表片段。需要它在横向显示列表视图旁边的信息。

SignsMainActivity.class（首先开始于： Intent i = new Intent（getActivity（），SignsMainActivity.class）; startActivity（ⅰ））

public class SignsMainActivity extends SingleFragmentActivity {

@Override
protected Fragment createFragment() {
    return new SignsMainFragment();   }}

SignsMainFragment.class

public class SignsMainFragment extends ListFragment {

private ArrayList<Signs> storage;


@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    storage = SignStorage.get(getActivity()).getStorageOfSigns();
    SignAdapter adapter = new SignAdapter(storage);
    setListAdapter(adapter);
}

@Override
public void onResume() {
    super.onResume();
    ((SignAdapter)getListAdapter()).notifyDataSetChanged();
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    Signs signs = ((SignAdapter)getListAdapter()).getItem(position);

    Intent intent = new Intent(getActivity(), SignsActivity.class);
    intent.putExtra(SignsFragment.EXTRA_SIGNS_ID, signs.getId());
   startActivity(intent);}


private class SignAdapter extends ArrayAdapter<Signs> {

    public SignAdapter(ArrayList<Signs> sSigns){
        super(getActivity(), 0, sSigns);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        //If we were given a view, inflate one
        if(convertView ==null){
            convertView = getActivity().getLayoutInflater().inflate(R.layout.sign_row, null);
        }
        //Configure the view for this Crime
        Signs signs = getItem(position);
        TextView titleTextView = (TextView)convertView.findViewById(R.id.label);
        titleTextView.setText(signs.getName());

        return convertView;        }}}

SignsActivity.class

public class SignsActivity extends SingleFragmentActivity {

@Override
protected Fragment createFragment() {
    UUID signsId = (UUID) getIntent().getSerializableExtra(SignsFragment.EXTRA_SIGNS_ID);
    return SignsFragment.newInstance(signsId);}}

SignsFragment.class

public class SignsFragment extends Fragment{

public static final String EXTRA_SIGNS_ID = "signs_id";
private Signs mSign;
private TextView nameURLView;
private TextView imageURLView;
private TextView illustrationURLView;


@Override
public void onCreate(Bundle saveInstanceState){
    super.onCreate(saveInstanceState);
    UUID signsID = (UUID)getArguments().getSerializable(EXTRA_SIGNS_ID);
    mSign = SignStorage.get(getActivity()).getSign(signsID);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState){
    View view = inflater.inflate(R.layout.sign_details,parent,false);

    nameURLView = (TextView)view.findViewById(R.id.details);
    nameURLView.setText(mSign.getName());

    return view;
}

public static SignsFragment newInstance(UUID signsId){
    Bundle args = new Bundle();
    args.putSerializable(EXTRA_SIGNS_ID, signsId);

    SignsFragment fragment = new SignsFragment();
    fragment.setArguments(args);

    return fragment;
}}

SingleFragmentActivity.class（我猜这里是我需要调整魔法的地方吗？）

public abstract class SingleFragmentActivity extends FragmentActivity {

//Used to instanciate the fragment (subclasses of this class will implement the method to return an instance of the fragment that the activity is hosting)
protected abstract Fragment createFragment();
private FragmentManager fm;

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

    fm = getSupportFragmentManager();
    Fragment fragment = fm.findFragmentById(R.id.singleFragmentContainer);

    if(fragment == null){
        fragment = createFragment();
        fm.beginTransaction().add(R.id.singleFragmentContainer, fragment).commit();
    }

}}

存储标志对象：

public class SignStorage {

private static SignStorage mSignStorage;
private Context context;
private ArrayList<Signs> storageOfSigns;
private Signs signs;
private static final String TAG="xx";

private SignStorage(Context appContext){
    context = appContext;
    storageOfSigns = new ArrayList<Signs>();
    primitiveFix();
}

public static SignStorage get(Context c){
    if (mSignStorage == null){
        mSignStorage = new SignStorage(c.getApplicationContext());
    }
    return mSignStorage;
}

public ArrayList<Signs> getStorageOfSigns() {
    return storageOfSigns;
}

public void setStorageOfSigns(ArrayList<Signs> storageOfSigns) {
    this.storageOfSigns = storageOfSigns;
}

public Signs getSign(UUID id){
    for (Signs s : storageOfSigns){
        if (s.getId().equals(id))
            return s;
    }
    return null;
}

private void primitiveFix(){

    String basePath = Environment.getExternalStorageDirectory().toString()+"/PictureTalk/Signs/";
    String name;
    String imageURL;
    String videoUrl;
    String illuUrl;
    Signs s;

    name = "abonnere";
    imageURL = basePath+"picture/adresse.jpg";
    videoUrl = basePath+"video/adresse.mp4";
    illuUrl = basePath+"illustrative/adresse.jpg";
    s = new Signs(name,imageURL,videoUrl,illuUrl);
    storageOfSigns.add(s);
THIS LIST GOES ON DOWNWARDS to get some items to display, will be filled later in another    
way...

Signs.class

public class Signs {

UUID id;
String name;
String videoURL;
String imageURL;
String illustrativeURL;

public Signs(String name,String videoURL,String imageURL,String illustrativeURL){
    this.id = UUID.randomUUID();
    this.name = name;
    this.videoURL = videoURL;
    this.imageURL = imageURL;
    this.illustrativeURL = illustrativeURL;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getVideoURL() {
    return videoURL;
}

public void setVideoURL(String videoURL) {
    this.videoURL = videoURL;
}

public String getBitmapURL() {
    return imageURL;
}

public void setBitmapURL(String bitmapURL) {
    this.imageURL = bitmapURL;
}

public UUID getId() {
    return id;
}

}

acitivty_single_fragment.xml（第一个空白xml）

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/singleFragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>

sign_row.xml（列表视图的xml）

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

<TextView
    android:id="@+id/label"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@+id/label"
    android:textSize="20px" >
</TextView>

</LinearLayout>

sign_details.xml（要显示的对象的详细区域，没有添加更多文本框喷射......）

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

<TextView
    android:id="@+id/details"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@+id/label"
    android:textSize="20px" >
</TextView>

</LinearLayout>

Answer 1

要使用片段实现列表/详细信息屏幕，您希望拥有一个包含两个片段的活动，而不是两个单独的活动。通常，您可以将活动视为代表全屏。

换句话说，您不需要SingleFragmentActivity或SignsActivity。然后，您的SignsMainActivity布局XML可以将您的列表和详细信息片段并排放置。片段指南有一个很好的XML示例： http://developer.android.com/guide/components/fragments.html

复制该XML并更改名称会为您提供一个新的signs_main_activity.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <fragment android:name="SignsMainFragment"
            android:id="@+id/signs-main"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="match_parent" />
    <fragment android:name="SignsFragment"
            android:id="@+id/signs"
            android:layout_weight="2"
            android:layout_width="0dp"
            android:layout_height="match_parent" />
</LinearLayout>

然后将此XML设置为主要活动的内容视图：

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

如何解决列表视图与对象，纵向单窗格，横向双窗格

1 个答案: