android – 应用程序退出导航抽屉内的片段内的预定按钮

当我尝试从子片段移动到父片段时,我的应用程序退出(它不会崩溃).Hhere LandingActivity. java是我调用片段ChAnnelGrid.java的主要活动,它调用片段GridMain.java.当我按下后退按钮时片段中的移动设备GridMain应用程序退出而不是移动到ChAnnelGrid.java.I已经添加了addToBACkStack(“tag”)到片段并尝试使用onKey()..我在不同设备上测试了我的应用程序..我检查了其他解决方案有同样的问题并尝试过但没有任何作用..

Navigation Drawer-LandingActivity.java-ChaanelGrid.java(Fragment)-GridMain.java(Fragment)

LandingActivity.java

currentFragment = new ChaanelGrid();

                currentFragment.setArguments(args);
                frgManager = getFragmentManager();

                frgManager.begintransaction().add(R.id.content_frame,currentFragment).addToBACkStack("tag")
                        .commit();

ChaanelGrid.java

Fragment currentFragment = new GridMain();



                    FragmentManager frgManager;
                    frgManager = getFragmentManager();
                    frgManager.begintransaction().add(R.id.content_frame,currentFragment).addToBACkStack("GridMain")
                            .commit()

GridMain.java(我试过没有onKey()方法但也没用)

rootView.setOnKeyListener(new View.onKeyListener() {


   @Override
        public Boolean onKey(View v,int keyCode,KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK)
            {
                Fragment currentFragment = new ChaanelGrid();


                FragmentManager frgManager;
                frgManager = getFragmentManager();
                frgManager.begintransaction().replace(R.id.content_frame,currentFragment)
                        .commit();
                return true;
            }

logcat详细

10-31 21:46:57.954  24452-24452/D/ActivityThread﹕ ACT-AM_ON_PAUSE_CALLED ActivityRecord{41eb8b98 token=android.os.binderProxy@41bb9828 {xyz/xyz..activity.LandingActivity_}}
10-31 21:46:57.971  24452-24452/ D/ActivityThread﹕ ACT-PAUSE_ACTIVITY_FINISHING handled : 0 / android.os.binderProxy@41bb9828
10-31 21:46:58.007  24452-24452/ V/InputMethodManager﹕ focusOut: android.widget.GridView@41f06f40 mServedView=android.widget.GridView@41f06f40 winFocus=false
10-31 21:46:58.297  24452-24452/ I/SurfaCETextureClient﹕ [0x5143bc58] frames:44,duration:1.002000,fps:43.883736
10-31 21:46:58.350  24452-24452/ D/OpenGLRenderer﹕ Flushing caches (mode 0)
10-31 21:46:58.432  24452-24452/ D/OpenGLRenderer﹕ Flushing caches (mode 0)
10-31 21:46:58.753  24452-24452/ D/OpenGLRenderer﹕ Flushing caches (mode 0)
10-31 21:46:58.754  24452-24452/ D/OpenGLRenderer﹕ Flushing caches (mode 0)
10-31 21:46:58.755  24452-24452/ D/OpenGLRenderer﹕ Flushing caches (mode 2)
10-31 21:46:58.879  24452-24452/ D/ActivityThread﹕ ACT-DESTROY_ACTIVITY handled : 1 / android.os.binderProxy@41bb9828

我尝试在LandingActivity.java中添加以下内容

@Override

public void onBACkPressed() {
    FragmentManager frgManager;
    frgManager = getFragmentManager();

    Fragment fragment = fragmentManager.findFragmentByTag("GridMain");
    if (fragment != null) {
        GridMain gridMain = (GridMain) fragment;
        if (!gridMain.onBACkPressed()) {
            super.onBACkPressed();
        }
    }
    else {
        super.onBACkPressed();
    }
}

并在GridMain.java中跟随

protected Boolean onBACkPressed() {
        FragmentManager frgManager;
        frgManager = getFragmentManager();
        frgManager.popBACkStack();
        return true;
    }

使用Log我检查了LandingActivity.java的onBACkPressed(),但仍然是相同的输出..

// "State Machine" variables: to inDicate which is the active Fragment.
private static Boolean isHelpShown = false;
protected static Boolean isInfoShown = false;
protected static Boolean ismainShown = false;
private static Boolean isViewShown = false;

// Used to switch between Fragments.
private static enum Fragments
{
    MAIN,VIEW,HelP,INFO
}

@Override
public final void onBACkPressed()
{
    if (ismainShown)
    {
        // We're in the MAIN Fragment.
        finish();
    }
    else
    {
        // We're somewhere else,reload the MAIN Fragment.
        showFragment(Fragments.MAIN);
    }
}

private final void showFragment(final Fragments FragmentTypE)
{
    isViewShown = false;
    isHelpShown = false;
    isInfoShown = false;
    ismainShown = false;

    final Fragmenttransaction ft =
        getSupportFragmentManager().begintransaction();

    /*
    replace whatever is in the fragment_container view with this
    fragment,and add the transaction to the BACk stack so the user can
    navigate BACk.
    */
    switch(FragmentTypE)
    {
        case HelP:
        {
            ft.replace(R.id.frgMaster,new FRG_Help());
            isHelpShown = true;
            break;
        }
        case INFO:
        {
            ft.replace(R.id.frgMaster,new FRG_Info());
            isInfoShown = true;
            break;
        }
        case VIEW:
        {
            ft.replace(R.id.frgMaster,new FRG_View());
            isViewShown = true;
            break;
        }
        case MAIN:
        {
            ft.replace(R.id.frgMaster,new FRG_Main());
            ismainShown = true;
            break;
        }
    }

    ft.setTransition(Fragmenttransaction.TRANSIT_FRAGMENT_OPEN);

    // Finalize the transaction...
    ft.commit();

    getSupportFragmentManager().executePendingtransactions();
}