android - onClickListener 不适用于抽屉导航

Question

我正在尝试在抽屉导航项目上设置一个 OnClickListener，但我似乎无法绕过。从抽屉中单击一个项目时，应该会打开一个新的 Intent 。我什至试着一步步跟着这个视频看，问题仍然存在。

https://www.youtube.com/watch?v=M_4Oh2FeRYs

我是 android 的新手，所以我似乎找不到错误。

这是我的java代码:

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
    private ActionBarDrawerToggle mToggle;
    private DrawerLayout mDrawerLayout;
    private NavigationView navView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gv = findViewById(R.id.gridView);
        //Drawer
        DrawerLayout mDrawerLayout = findViewById(R.id.drawerLayout);
        mToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.string.drawer_open,R.string.drawer_close);
        mDrawerLayout.addDrawerListener(mToggle);
        mToggle.syncState();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        navView = findViewById(R.id.navView);
        navView.setNavigationItemSelectedListener(this);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(mToggle.onOptionsItemSelected(item)){
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    }
  
    @Override
    public void onBackPressed() {
        if(mDrawerLayout.isDrawerOpen(GravityCompat.START)){
            mDrawerLayout.closeDrawer(GravityCompat.START);
        }
        else {
            super.onBackPressed();
        }
    }


    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();

        switch (id) {
            case R.id.nav2:
                Toast.makeText(MainActivity.this, "nav1 selected", Toast.LENGTH_SHORT).show();
                Intent i = new Intent(MainActivity.this, new.class);
                startActivity(i);
                break;

            case R.id.nav1:
                Toast.makeText(MainActivity.this, "nav2 selected", Toast.LENGTH_SHORT).show();
                Intent j = new Intent(MainActivity.this, new.class);
                startActivity(j);
                break;
        }
            mDrawerLayout.closeDrawer(GravityCompat.START);
            return true;

    }

}

这是 navigation_menu 布局文件:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/nav1"
        android:title="@string/nav1"
        android:icon="@mipmap/nav2"
        />
    <item
        android:id="@+id/nav2"
        android:title="@string/nav2"
        android:icon="@mipmap/nav1"/>
</menu>

这是 mainactivity.xml:

   <?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawerLayout"
    android:nestedScrollingEnabled="true"
    tools:context="com.example.xxx.xxx.MainActivity"
    app:layout_behavior="android.support.design.widget.AppBarLayout.ScrollingViewBehaviour">
<LinearLayout
    android:orientation="vertical"
    android:background="#ffff"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:fitsSystemWindows="true"
    android:layout_height="match_parent"
    tools:context="com.example.xxx.xxx.MainActivity"
    android:isScrollContainer="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="75dp"
        android:background="#ff77"
        android:layout_marginTop="5dp">
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/banner1"
            android:src="@drawable/banner1"
            android:scaleType="fitXY"
            android:layout_marginLeft="0dp"
            android:layout_marginRight="0dp"/>
    </LinearLayout
        <GridView
            android:id="@+id/gridView"
            android:nestedScrollingEnabled="false"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="#ffff"
            android:numColumns="3"
            android:padding="2dp"
            android:gravity="center"
            android:horizontalSpacing="2dp"
            android:stretchMode="columnWidth"
            android:verticalSpacing="2dp">
        </GridView>
</LinearLayout>
    <android.support.design.widget.NavigationView
        android:id="@+id/navView"
        android:layout_width="200dp"
        android:layout_height="match_parent"
        app:menu="@menu/navigation_menu"
        android:layout_gravity="start"
        android:alpha="0.4"
        android:fitsSystemWindows="true"/>
</android.support.v4.widget.DrawerLayout>

Answer 1

试试这个

public class Main extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
    private ActionBarDrawerToggle mToggle;
    private DrawerLayout mDrawerLayout;
    private NavigationView navView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //Drawer
    mDrawerLayout = findViewById(R.id.drawer_layout);
    mToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.string.navigation_drawer_open,R.string.navigation_drawer_close);
    mDrawerLayout.addDrawerListener(mToggle);
    mToggle.syncState();
//        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    navView = findViewById(R.id.nav_view);
    navView.setNavigationItemSelectedListener(this);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(mToggle.onOptionsItemSelected(item)){
        return true;
    }
    return super.onOptionsItemSelected(item);
}


@Override
public void onBackPressed() {
    if(mDrawerLayout.isDrawerOpen(GravityCompat.START)){
        mDrawerLayout.closeDrawer(GravityCompat.START);
    }
    else {
        super.onBackPressed();
    }
}


@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    int id = item.getItemId();

    switch (id) {
        case R.id.nav_camera:
            Toast.makeText(Main.this, "nav1 selected", Toast.LENGTH_SHORT).show();
            Intent i = new Intent(Main.this, test.class);
            startActivity(i);
            break;

        case R.id.nav_gallery:
          /*  Toast.makeText(Main.this, "nav2 selected", Toast.LENGTH_SHORT).show();
            Intent j = new Intent(Main.this, new.class);
            startActivity(j);*/
            break;
    }
    mDrawerLayout.closeDrawer(GravityCompat.START);
    return true;

}

}

为我工作或者转到文件>新建> Activity (最后一部分)>抽屉导航 Activity 这将为您的项目添加一个抽屉导航类