Question

我实际上有一个包含多个活动的应用程序（对于我的工具栏的每个图标都有），如果用户之前已经打开它，我还希望能够从堆栈中显示这些活动的最后一个片段。正如您在下面的BaseActivity类中所看到的（我为所有活动扩展），我已经将片段添加到堆栈中。

这是我的班级：

public class BaseActivity extends AppCompatActivity {

private final String TAG = "BaseActivity";

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    return false;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    return super.onOptionsItemSelected(item);
}

public void setImageLoaderConfig(Context context) {
    DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
            .cacheInMemory(true).cacheOnDisk(true)
            .resetViewBeforeLoading(true)
            .build();
    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context)
            .defaultDisplayImageOptions(defaultOptions)
            .build();
    ImageLoader.getInstance().init(config);
}

public void initToolBar() {
    LinearLayout linearLayout = (LinearLayout) findViewById(R.id.toolbar_layout);
    Toolbar toolbar = (Toolbar) linearLayout.findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    if (toolbar != null) {
        initToolbarOnClickListener();
    }
}

private void initToolbarOnClickListener() {

    (findViewById(R.id.toolbar_relativelayout_news)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showActivity(ArticlesActivity.class);
        }
    });
    (findViewById(R.id.toolbar_relativelayout_toilettes)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showActivity(ToilettesActivity.class);
        }
    });
    (findViewById(R.id.toolbar_relativelayout_practice)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showActivity(PratiquesActivity.class);
        }
    });
    (findViewById(R.id.toolbar_relativelayout_diary)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showActivity(AgendaActivity.class);
        }
    });
    (findViewById(R.id.toolbar_relativelayout_forum)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showActivity(ForumActivity.class);
        }
    });
}

public void updateToolbarIcons(Integer position) {
    ImageView imageViewIcon;
    Integer[] activeDrawableIds = {R.drawable.menu_actu_hover_320, R.drawable.menu_toilette_hover_320,
            R.drawable.menu_pratiques_hover_320, R.drawable.menu_agenda_hover_320, R.drawable.menu_forum_hover_320};
    Integer[] inactiveDrawableIds = {R.drawable.menu_actu_160, R.drawable.menu_toilette_320,
            R.drawable.menu_pratiques_320, R.drawable.menu_agenda_320, R.drawable.menu_forum_320};
    Integer[] imageviewIds = {R.id.toolbar_imageview_news, R.id.toolbar_imageview_bathroom,
            R.id.toolbar_imageview_practice, R.id.toolbar_imageview_diary, R.id.toolbar_imageview_forum};
    for (int i = 0; i < imageviewIds.length; i++) {
        Log.d(TAG, i + " " + imageviewIds[i]);
        imageViewIcon = (ImageView) findViewById(imageviewIds[i]);
        if (i == position) {
            imageViewIcon.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), activeDrawableIds[i]));
        } else {
            imageViewIcon.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), inactiveDrawableIds[i]));
        }

    }
    if (AfamiciApp.isConnected()) {
        ImageView imageViewUser = (ImageView) findViewById(R.id.toolbar_imageview_user);
        imageViewUser.setVisibility(View.VISIBLE);
    }
}

public void showActivity(Class activityClass) {
    Intent intent = new Intent(this, activityClass);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}

public void initIsConnected() {
    if (AfamiciApp.getMail() != null && AfamiciApp.getPassword() != null) {
        AfamiciApp.setIsConnected(true);
    }
}

public void showConnexionFragment(Integer layoutId, Integer id) {
    Bundle args = new Bundle();
    args.putInt("id", id);
    args.putInt("containerId", layoutId);
    ConnexionFragment connexionFragment = new ConnexionFragment();
    connexionFragment.setArguments(args);
    getSupportFragmentManager()
            .beginTransaction()
            .replace(layoutId, connexionFragment, null)
            .addToBackStack(null)
            .commit();
}

public void showCreationCommentaireFragment(Integer layoutId, Integer id, Boolean isFromConnection) {
    if (isFromConnection) {
        getSupportFragmentManager().popBackStack();
    }
    Bundle args = new Bundle();
    args.putInt("id", id);
    CommentaireFragment commentaireFragment = new CommentaireFragment();
    commentaireFragment.setArguments(args);
    getSupportFragmentManager()
            .beginTransaction()
            .replace(layoutId, commentaireFragment, null)
            .addToBackStack(null)
            .commit();
}

public void showCreationCompteFragment(Integer layoutId, Integer id) {
    Bundle args = new Bundle();
    args.putInt("id", id);
    CreationCompteFragment creationCompteFragment = new CreationCompteFragment();
    creationCompteFragment.setArguments(args);
    getSupportFragmentManager()
            .beginTransaction()
            .replace(layoutId, creationCompteFragment, null)
            .addToBackStack(null)
            .commit();
}

}

预先感谢您的回复：）

Answer 1

您可以使用以下内容获取FrameLayout中的当前片段（添加最后一个片段）

Fragment fragment = getSupportFragmentManager().findFragmentById(layoutId); //layoutId is id of FrameLayout

Android应用程序 - 如果已加载，则为每个活动获取最后一个片段

1 个答案: