導航菜單項單擊不起作用

Question

我為我的應用程序創建了一個側面菜單（導航菜單），並重寫了OnOptionsItemSelected（MenuItem item）方法，以便在單擊每個菜單項時添加一些自定義行為。 但是，在編寫了一些代碼后，當單擊第一個菜單項時（nav_home <-id）將顯示Toast，當我單擊它時什么也沒有發生，並且我無法在此處找出問題...

    @Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(mToggle.onOptionsItemSelected(item)) {
        return true;
    }
    // When a menu item is clicked, then depending on it's id start a new Activity
    switch (item.getItemId()) {
        case R.id.nav_home:
            Toast.makeText(this, "Clicked", Toast.LENGTH_SHORT).show();
            break;
        default:
            return super.onOptionsItemSelected(item);
    }
    return true;
}

這是我的整個MainActivity類：

package com.dcv.spdesigns.dokkancards;

import android.content.Intent;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.DisplayMetrics;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import com.dcv.spdesigns.dokkancards.model.ImageAdapter;
import com.dcv.spdesigns.dokkancards.ui.CardViewActivity;

public class MainActivity extends AppCompatActivity {
GridView gridView;

// NavMenu member vars
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle; // Button for toggling the side menu

private Toolbar mToolbar;

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

    // Get Screen Size Details
    DisplayMetrics displayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    int height = displayMetrics.heightPixels;
    final int width = displayMetrics.widthPixels;

    gridView = (GridView) findViewById(R.id.gridViewLayout);
    gridView.setAdapter(new ImageAdapter(this)); // used to set the contents of the GridView-in this case images-

    // When an item from the GridView gets clicked
    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            // Create a new Intent...
            Toast.makeText(MainActivity.this, "Position: " + position, Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(MainActivity.this,CardViewActivity.class);
            intent.putExtra("Card Index",position);
            intent.putExtra("SCREEN_WIDTH",width);
            startActivity(intent);
        }
    });

    mToolbar = (Toolbar) findViewById(R.id.navActionBar);
    setSupportActionBar(mToolbar); // check quick doq
    getSupportActionBar().setDisplayShowTitleEnabled(false);
    mToolbar.setTitle("");
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
    mToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.drawer_open,R.string.drawer_closed); // Instantiating our button

    mDrawerLayout.addDrawerListener(mToggle);
    mToggle.syncState();


}

// When an item from the Action Bar gets tapped, then...
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(mToggle.onOptionsItemSelected(item)) {
        return true;
    }
    // When a menu item is clicked, then depending on it's id start a new Activity
    switch (item.getItemId()) {
        case R.id.nav_home:
            Toast.makeText(this, "Clicked", Toast.LENGTH_SHORT).show();
            break;
        default:
            return super.onOptionsItemSelected(item);
    }
    return true;
}
}

主要xml文件：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary"
    tools:context="com.dcv.spdesigns.dokkancards.MainActivity"
    android:id="@+id/drawerLayout">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!-- Include the custom Action Bar we created -->

    <include layout="@layout/navigation_action_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>

    <GridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:columnWidth="90dp"
        android:numColumns="4"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:stretchMode="columnWidth"
        android:gravity="center"
        android:id="@+id/gridViewLayout"/>

    <!-- Add text & images -->
</LinearLayout>

<!-- The actual side menu Nav View -->
<android.support.design.widget.NavigationView
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:headerLayout="@layout/navigation_header"
    app:menu="@menu/navigation_menu">

</android.support.design.widget.NavigationView>

</android.support.v4.widget.DrawerLayout>

Answer 1

沒有完整的代碼很難說，但是這個問題的一個普遍根源是導航並不位於所有其他元素之上。 為了確保這一點，請將標題/導航參考放置在布局中的整個底部。 布局xml中的項目越低，其z-index越高。

布局的最后幾行應如下所示：

    ...
    <include layout="@layout/header" />
    <include layout="@layout/navigation" />
</android.support.v4.widget.DrawerLayout>

此外，我看不到您關閉DrawerLayout標簽。

我在導航中檢測點擊的方式通常也有所不同。 我實現了標題和導航，如下所示：

 protected void setUpHeader(int headerRequestingActivity) {
    setContentView(headerRequestingActivity);
    headerPresenter = new HeaderPresenterImpl(this);
    drawerHeaderView = findViewById(R.id.navigationheader);
    toolbar = (Toolbar) findViewById(R.id.tbHeader);
    setSupportActionBar(toolbar);

    final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer);
    final NavigationView navigationView = (NavigationView) findViewById(R.id.navigation);
    navigationView.setNavigationItemSelectedListener(this);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
        @Override
        public void onDrawerStateChanged(int newState) {
            if (drawer.isDrawerOpen(GravityCompat.START)) {
                //do something on opening the navigation
            } else {
                //optional actions when navigation menu closes
            }
        }
    };
    drawer.setDrawerListener(toggle);
    toggle.syncState();
}

並通過以下方法監聽點擊：

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case R.id.nav_changelanguage:
            //change language logic
            break;
        case R.id.nav_logout:
            //logout user
            break;
    }
    return true;
}

希望這可以幫助。