Question

web开发人员试图（并在努力）在这里进行android应用程序开发。我试图将侧面导航实施到登录系统中，以使UI看起来更好，并通常给我的应用程序更好的感觉。我遇到的问题是；

当前在应用程序的MainActivity（仪表板/主屏幕）上，我有一个按钮，该按钮基本上从正在使用以下代码的登录系统中注销用户。

    Button logoutBtn = findViewById(R.id.btnLogout);

    logoutBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            session.logoutUser();
            Intent i = new Intent(MainActivity.this, LoginActivity.class);
            startActivity(i);
            finish();

        }
    });

用户界面：

通过注销用户并将他们重定向到登录/注册页面，上述代码可以按预期工作。现在，我开始尝试实现我发现的（https://antonioleiva.com/materialize-app/）侧面导航，并且正在努力找出如何将上述按钮的功能赋予导航菜单项，如下所示；

我使用的侧面导航示例具有以下代码，该代码基本上呈现一条通知，以显示已选择了哪个侧面导航菜单项；

private void setupDrawerLayout() {
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    navigationView = (NavigationView) findViewById(R.id.navigation_view);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            Snackbar.make(content, menuItem.getTitle() + " pressed", Snackbar.LENGTH_LONG).show();
            menuItem.setChecked(true);
            drawerLayout.closeDrawers();
            return true;
        }
    });
}

这表示以下内容；

如果有人可以向我提供任何要点，提示或帮助，我可以为菜单选项提供退出按钮的功能，那么一旦我知道如何设置点击侦听器/运行代码的一部分，就可以完全理解。菜单选择，我可以继续加载不同的活动并继续构建我的应用程序。

非常感谢。

主屏幕（MainActivity.java）的完整代码如下；

package com.antonioleiva.materializeyourapp;

import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements 
RecyclerViewAdapter.OnItemClickListener {
private SessionHandler session;
private static List<ViewModel> items = new ArrayList<>();
private DrawerLayout drawerLayout;
private View content;
private RecyclerView recyclerView;
private NavigationView navigationView;

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

    session = new SessionHandler(getApplicationContext());
    User user = session.getUserDetails();
    TextView dashboardText = findViewById(R.id.dashboardText);
    dashboardText.setText("Welcome to gluca, " + user.getFullName() + "!");

    initRecyclerView();
    initFab();
    initToolbar();
    setupDrawerLayout();

    Button logoutBtn = findViewById(R.id.btnLogout);

    logoutBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            session.logoutUser();
            Intent i = new Intent(MainActivity.this, LoginActivity.class);
            startActivity(i);
            finish();

        }
    });

    content = findViewById(R.id.content);

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        setRecyclerAdapter(recyclerView);
    }
}

@Override
public void onEnterAnimationComplete() {
    super.onEnterAnimationComplete();
    setRecyclerAdapter(recyclerView);
    recyclerView.scheduleLayoutAnimation();
}

private void initRecyclerView() {
    recyclerView = (RecyclerView) findViewById(R.id.recycler);
    recyclerView.setLayoutManager(new GridLayoutManager(this, 2));

}

private void setRecyclerAdapter(RecyclerView recyclerView) {
    RecyclerViewAdapter adapter = new RecyclerViewAdapter(items);
    adapter.setOnItemClickListener(this);
    recyclerView.setAdapter(adapter);
}

private void initFab() {
    findViewById(R.id.fab).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Snackbar.make(content, "FAB Clicked", Snackbar.LENGTH_SHORT).show();
        }
    });
}

private void initToolbar() {
    final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    final ActionBar actionBar = getSupportActionBar();

    if (actionBar != null) {
        actionBar.setHomeAsUpIndicator(R.drawable.ic_menu_black_24dp);
        actionBar.setDisplayHomeAsUpEnabled(true);
    }
}

private void setupDrawerLayout() {
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    navigationView = (NavigationView) findViewById(R.id.navigation_view);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            Snackbar.make(content, menuItem.getTitle() + " pressed", Snackbar.LENGTH_LONG).show();
            menuItem.setChecked(true);
            drawerLayout.closeDrawers();
            return true;
        }
    });
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            drawerLayout.openDrawer(GravityCompat.START);
            return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onItemClick(View view, ViewModel viewModel) {
    DetailActivity.navigate(this, view.findViewById(R.id.image), viewModel);
}
}

Answer 1

如果将注销操作传递给新函数该怎么办，假设logout（）放在session.logoutUser(); Intent i = new Intent(MainActivity.this, LoginActivity.class); startActivity(i); finish();里面

然后，在onOptionsItemSelected函数内添加案例检查case (menuItem.getTitle =="Logout") {lougout();}

当然这只是一个主意，但您可以详细说明

Answer 2

下面是直接从菜单

注销的示例代码

注意：无需打开新的活动或片段即可注销。

以下是代码：

 @Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();
    if (id == R.id.nav_home) {
        fragment = new HomeFragment();
        title.setText(pref.getString(Constants.REGIS_FIRST_NAME, "")+" "+pref.getString(Constants.REGIS_LAST_NAME, ""));
    }
    if (id == R.id.nav_profile) {
        fragment = new ProfileFragment();
        title.setText("My Profile ");
    }
    if (id == R.id.nav_past) {
        fragment = new PastFragment();
        title.setText("Past Ceremony ");
    } 
     else if (id == R.id.nav_logout) {
        callLogout(); //logout here
    }

这是对话框代码：

 private void callLogout() {
    final Dialog dialog1;
    dialog1 = new Dialog(MainActivity.this);
    dialog1.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog1.setCancelable(false);
    dialog1.setContentView(R.layout.logout_dilaog);

    final TextView logoutTxt, yes, no;
    yes = dialog1.findViewById(R.id.yes);
    no = dialog1.findViewById(R.id.no);
    logoutTxt = dialog1.findViewById(R.id.logoutTxt);

    Log.e("NAME", "" + pref.getString("USER_NAME_LOGIN", ""));
    logoutTxt.setText("Are you sure to logout ?");

    yes.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            editor = pref.edit();
            editor.clear();
            editor.apply();
            // utils.showtoast("Logout");
            finish();

            Intent intent = new Intent(MainActivity.this, LoginActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
        }
    });

    no.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog1.dismiss();
        }
    });
    dialog1.show();
}

logout_dialog.xml

<?xml version="1.0" encoding="utf-8"?>

<TextView
    android:layout_marginTop="10dp"
    android:gravity="center_horizontal"
    android:textSize="16dp"
    android:fontFamily="@font/lato_semibold"
    android:id="@+id/logoutTxt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="@color/black" />

<LinearLayout
    android:gravity="right"
    android:layout_marginTop="15dp"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/yes"
        android:layout_marginRight="15dp"
        android:layout_width="90dp"
        android:layout_height="30dp"
        android:text="YES"
        android:fontFamily="@font/lato_regular"
        android:gravity="center"
        android:textColor="@color/white"
        android:textSize="14dp"
        android:background="@drawable/ripple_btn"
        />

    <TextView
        android:layout_marginRight="15dp"
        android:id="@+id/no"
         android:layout_width="90dp"
        android:layout_height="30dp"
         android:text="NO"
        android:fontFamily="@font/lato_regular"
        android:gravity="center"
         android:textColor="@color/white"
        android:textSize="14dp"
        android:background="@drawable/ripple_btn"
        />


</LinearLayout>

如何赋予导航菜单选择功能？

2 个答案: