0

メイン アクティビティとリスト フラグメントの間で文字列を共有したいと考えていました。だから私はShared.Preferencesを使うことができると思った。私はアンドロイドが初めてで、共有設定を使い始めたばかりなので、この問題に直面しています。

これは私の共有設定クラスです

public class AppPrefs { 
    private static final String USER_PREFS = "USER_PREFS"; 
    private SharedPreferences appSharedPrefs;
    private SharedPreferences.Editor prefsEditor; 
    private String responseXml = "response_xml_prefs";  
    public AppPrefs(Context context){  
        this.appSharedPrefs = context.getSharedPreferences(USER_PREFS, Activity.MODE_PRIVATE); 
        this.prefsEditor = appSharedPrefs.edit();  
        } 
    public String getResponse_xml() {  
        return appSharedPrefs.getString(responseXml, "unknown");
        } 
    public void setResponse_xml(String _responser_xml) { 
        prefsEditor.putString(responseXml, _responser_xml).commit();
        }

    }

これは私のmainActivityにあります

Context context = getApplicationContext(); 
    AppPrefs appPrefs = new AppPrefs(context); 
    appPrefs.setResponse_xml(responseXml);

そしてこれは私のListFragmentにあります

Context context = this.getActivity(); 
    AppPrefs appPrefs = new AppPrefs(context); 
    String responseXml = appPrefs.getResponse_xml();

but when i do Log.e("responseXml", responseXml);

m getting a default string "unknown" which i have soted in the shared preference class. please let me know where have i gone wrong :(

Update 1 

public class TabActivity extends Activity {
MyTask myNewTask;
String responseXml;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent in = getIntent();
    String requestXml=in.getStringExtra("xml");
    myNewTask = new MyTask(requestXml);
    myNewTask.setOnResultListener(asynResult);
    myNewTask.execute();


    ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    actionBar.setDisplayShowTitleEnabled(true);

    /** Creating All Tab */
    Tab tab = actionBar.newTab()
            .setText("All")
            .setTabListener(new CustomTabListener<AllMsgFragment>(this, "All", AllMsgFragment.class,responseXml));
    //.setIcon(R.drawable.android);

    actionBar.addTab(tab);


    /** Creating Success Tab */
    tab = actionBar.newTab()
            .setText("Success")
            .setTabListener(new CustomTabListener<SuccessMsgFragment>(this, "Success", SuccessMsgFragment.class,responseXml));
    //.setIcon(R.drawable.apple);

I donno how to pass the bundle

}

OnAsyncResult asynResult = new OnAsyncResult() {

    @Override
    public void onResultSuccess(final int resultCode, final String responseXml) {

        runOnUiThread(new Runnable() {
            public void run() {
                storeData(responseXml);
            }


        });
    }


    @Override
    public void onResultFail(final int resultCode, final String errorMessage) {
        runOnUiThread(new Runnable() {
            public void run() {

            }
        });

    }



};

void storeData(String responseXml){
    //this.responseXml=responseXml;
    /*Context context = getApplicationContext(); 
    AppPrefs appPrefs = new AppPrefs(context); 
    appPrefs.setResponse_xml(responseXml);*/

    Fragment fragment = new Fragment();
    Bundle bundle = new Bundle();
    bundle.putString("responseXml", responseXml);
    fragment.setArguments(bundle);

}

}

its showing null pointer exception

Edit 2

Using a static variable solved my issue

4

1 に答える 1

1

バンドルを使用して文字列をフラグメントに渡すことをお勧めします。

Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putString(key, value);
fragment.setArguments(bundle);

およびフラグメント内 (つまり、onCreate())

Bundle bundle = this.getArguments();
String myString = bundle.getString(key, defaultValue);
于 2013-08-22T18:35:55.597 に答える