Android的后退按钮与Fragment和他的活动不同的动作

Posted 2023-04-15

【中文标题】Android的后退按钮与Fragment和他的活动不同的动作

【英文标题】：Android Back button not the same action from Fragment and his activity

【发布时间】：2015-06-27 21:18:13

【问题描述】：

我有这个：

MainActivity.java：

package activity;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;

import com.example.pierre.tan.R;

import adapter.FragmentDrawer;
import hotchemi.android.rate.AppRate;
import hotchemi.android.rate.OnClickButtonListener;
import model.Arrets;


public class MainActivity extends ActionBarActivity implements FragmentDrawer.FragmentDrawerListener 

private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
public static Arrets arrets = null;






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

    AppRate.with(this)
            .setInstallDays(5) // default 10, 0 means install day.
            .setLaunchTimes(10) // default 10
            .setRemindInterval(1) // default 1
            .setShowNeutralButton(true) // default true
            .setDebug(false) // default false
            .setOnClickButtonListener(new OnClickButtonListener()  // callback listener.
                @Override
                public void onClickButton(int which) 
                    Log.d(MainActivity.class.getName(), Integer.toString(which));
                
            )
            .monitor();

    // Show a dialog if meets conditions
    AppRate.showRateDialogIfMeetsConditions(this);


    arrets = new Arrets();

    mToolbar = (Toolbar) findViewById(R.id.toolbar);



    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);


    View searchContainer = findViewById(R.id.search_container);




    drawerFragment = (FragmentDrawer)
            getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
    drawerFragment.setDrawerListener(this);
    drawerFragment.setFocusableInTouchMode(false);

    // display the first navigation drawer view on app launch
    displayView(0);








@Override
public void onBackPressed() 
    super.onBackPressed();
    new AlertDialog.Builder(this)
            .setMessage("Voulez-vous quitter l\'application ?")
            .setPositiveButton("oui", new DialogInterface.OnClickListener() 
                @Override
                public void onClick(DialogInterface dialog, int which) 

                    Intent intent = new Intent(Intent.ACTION_MAIN);
                    intent.addCategory(Intent.CATEGORY_HOME);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(intent);
                    finish();
                
            ).setNegativeButton("non", null).show();






@Override
public void onDrawerItemSelected(View view, int position) 
    displayView(position);


private void displayView(int position) 
    Fragment fragment = null;
    String title = getString(R.string.app_name);
    switch (position) 
        case 0:
            fragment = new HomeFragment();
            title = getString(R.string.title_home);
            break;
        case 1:
            fragment = new ArretsFragment();
            title = "Arrets";
            break;
        case 2:
            fragment = new AboutFragment();
            title = "A propos";
            break;
        case 3:
            fragment = new SettingsFragment();
            title = "Paramètres";
            break;
        default:
            break;
    

    if (fragment != null) 
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_body, fragment);
        fragmentTransaction.commit();

        // set the toolbar title
        getSupportActionBar().setTitle(title);
    

我有 HomeFragment.java ：

package activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.pierre.tan.R;

import java.util.List;

import adapter.CustomListAdapter;
import model.Arrets;
import util.Spfav;


public class HomeFragment extends Fragment 

ListView favoriteList;
Spfav sharedPreference;
List<Arrets> favorites;

Activity activity;
CustomListAdapter productListAdapter;

public HomeFragment() 
    // Required empty public constructor


@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);

    activity = getActivity();



@Override
public void onActivityCreated(Bundle savedInstanceState) 
    super.onActivityCreated(savedInstanceState);








@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 






    View view = inflater.inflate(R.layout.fragment_home, container, false);
    View searchContainer = getActivity().findViewById(R.id.search_container);
    final EditText toolbarSearchView = (EditText) getActivity().findViewById(R.id.search);
    ImageView searchClearButton = (ImageView) getActivity().findViewById(R.id.search_clear);
    searchClearButton.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            toolbarSearchView.setText("");
        
    );
    searchContainer.setVisibility(View.GONE);


    sharedPreference = new Spfav();
    favorites = sharedPreference.getFavorites(activity);

    if (favorites == null) 
        Toast.makeText(getActivity(), "Null", Toast.LENGTH_SHORT).show();
     else 

        if (favorites.size() == 0) 
            Toast.makeText(getActivity(), "Null", Toast.LENGTH_SHORT).show();


        


        favoriteList = (ListView) view.findViewById(R.id.list);
        if (favorites != null) 
            productListAdapter = new CustomListAdapter(activity, favorites);
            favoriteList.setAdapter(productListAdapter);
        


        favoriteList.setOnItemClickListener(new AdapterView.OnItemClickListener() 


            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) 


                TextView textView = (TextView) view.findViewById(R.id.lieu);
                String text = textView.getText().toString();


                TextView textView2 = (TextView) view.findViewById(R.id.arret);
                String libelle = textView2.getText().toString();

                Intent i = new Intent(getActivity(), TempsActivity.class);
                i.putExtra("text", text);
                i.putExtra("libelle", libelle);
                startActivity(i);


            
        );


        favoriteList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() 

            @Override
            public boolean onItemLongClick(
                    AdapterView<?> parent, View view,
                    int position, long id) 

                ImageView button = (ImageView) view
                        .findViewById(R.id.imgbtn_favorite);

                String tag = button.getTag().toString();

                    sharedPreference.removeFavorite(activity,
                            favorites.get(position));
                    button.setTag("grey");
                    button.setImageResource(R.drawable.ic_heart_white);
                   favorites.remove(favorites.get(position));
                    Toast.makeText(
                            activity,
                            activity.getResources().getString(
                                    R.string.remove_favr),
                            Toast.LENGTH_SHORT).show();
                sharedPreference.saveFavorites(activity, favorites);

                productListAdapter.notifyDataSetChanged();

 return true;
            

        );

        // Inflate the layout for this fragment

    

    return view;



public void onAttach(Activity activity) 
    super.onAttach(activity);



public void onDetach() 
    super.onDetach();

而且我不知道该怎么做：当我在片段中（只是 Homefragment）时，将一个新功能设置为后按，并且不执行活动的功能（谁为其他片段工作） .

对不起，我的英语不好，如果有人可以帮助我，那就太好了！

【参考方案1】：

在你的活动中试试这个：

public boolean onKeyDown(int keyCode, KeyEvent event) 
        Log.d(TAG, "onkeydown");
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) 

            //your code here

            return true;
        
        return super.onKeyDown(keyCode,event);
    

片段有自己的onBackPressed() 处理程序，它被调用而不是活动的处理程序。这样做是为了返回之前显示的片段，例如按下返回。