Android-在片段之間傳遞參數

Question

如上圖所示，我開發了一個android應用程序，

我使用了sherlock操作欄進行搜索，唯一的問題是，如果用戶要在Web選項卡中搜索某項內容，如果他/她想查看圖像結果，則他應該在“圖像”選項卡中鍵入並再次搜索，是否有任何方法可以傳遞edittext參數設置為其他選項卡，並在用戶更改選項卡時進行搜索？

主要活動：

public class MainActivity extends SherlockFragmentActivity implements
    TabListener {

private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private com.actionbarsherlock.app.ActionBar actionBar;
private String[] tabs = { "Sound", "Image", "Web" };

@Override
protected void onCreate(Bundle savedInstanceState) {        
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.activity_main);
    viewPager = (ViewPager) findViewById(R.id.pager);
    actionBar = getSupportActionBar();
    actionBar.setDisplayShowTitleEnabled(false);  
    actionBar.setDisplayShowHomeEnabled(false);
    mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
    actionBar.setHomeButtonEnabled(false);
    viewPager.setAdapter(mAdapter);
    viewPager.setOffscreenPageLimit(3);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    actionBar.addTab(actionBar.newTab().setText(tabs[0])
            .setTabListener(this), false);
    actionBar.addTab(actionBar.newTab().setText(tabs[1])
            .setTabListener(this), false);
    actionBar.addTab(actionBar.newTab().setText(tabs[2])
            .setTabListener(this), true);

    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    });
}

@Override
public void onTabSelected(com.actionbarsherlock.app.ActionBar.Tab tab,
        android.support.v4.app.FragmentTransaction ft) {
    viewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(com.actionbarsherlock.app.ActionBar.Tab tab,
        android.support.v4.app.FragmentTransaction ft) {
}

@Override
public void onTabReselected(com.actionbarsherlock.app.ActionBar.Tab tab,
        android.support.v4.app.FragmentTransaction ft) {
}
}

適配器：

public class TabsPagerAdapter extends FragmentPagerAdapter {

public TabsPagerAdapter(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int index) {

    switch (index) {
    case 0:
        return new Sound();
    case 1:
        return new Image();
    case 2:
        return new Search();
    }

    return null;
}

@Override
public int getCount() {
    return 3;
}

}

聲音片段：

public class Sound extends Fragment {

private String URL_ADDRESS, Servlet;
private ListView listview;
private ListViewAdapter adapter;
private List<Spanned> numberlist = new ArrayList<Spanned>();
private List<Ava2> avaList = new ArrayList<Ava2>();
private Boolean isInternetPresent = false;
private ConnectionDetector detector;
private View rootView;
private RelativeLayout loading, layout;
private int counter = 10;
private EditText editText;
private String a = "http://***";

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.ava, container, false);
    ImageButton voiceSearch = (ImageButton) rootView
            .findViewById(R.id.imageButton2);
    ImageButton buttonSearch = (ImageButton) rootView
            .findViewById(R.id.imageButton1);
    listview = (ListView) rootView.findViewById(R.id.listview);
    loading = (RelativeLayout) rootView.findViewById(R.id.loading);
    layout = (RelativeLayout) rootView.findViewById(R.id.layout);
    editText = (EditText) rootView.findViewById(R.id.editText1);
    editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId,
                KeyEvent event) {
            if (actionId == EditorInfo.IME_ACTION_SEARCH) {
                search();
                return true;
            }
            return false;
        }

    });
    buttonSearch.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            search();
        }
    });

    listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view,
                int position, long l) {
                try {
                    Intent i = new Intent(getActivity(), Play.class);

                    startActivity(i);
                } catch (Exception e) {
                }
            }
        }
    });

    return rootView;
}

Answer 1

首先，您可以編寫一個接口：

public interface OnProfileDataPass {
      public String getCurrentSearchword();
      public void setCurrentSearchword(String searchword);
}

然后在您的片段中：

public class WebFragment extends Fragment {
    private OnProfileDataPass dataPasser;

    @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        dataPasser = (OnProfileDataPass) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement OnProfileDataPass");
    }
    searchword = dataPasser.getCurrentSearchword();
    }
}

在您的活動中：

  public class MainActivity implements OnProfileDataPass {
     String currentSearchword;

 @Override
    public String getCurrentSearchword() {
        return currentSearchword;
    }

 @Override
    public String setCurrentSearchword(String searchword) {
        this.currentSearchword = searchword;
    }


}

這是我的solution.When你改變了水龍頭，你可以聽正確的事件，並與字getActivity.setCurrentSearchword(String newword)那么你就可以得到newword在片段的dataPasser變量的方法getCurrentSearchword()來獲取搜索詞。 我已經在我的應用程序中對其進行了測試。 希望對您有所幫助。

Answer 2

您應該在活動中保存editText的值，然后在調用片段時使用與此處所述相同的技術將其作為參數傳遞： http : //developer.android.com/reference/android/app/ Fragment.html