新 activity 在点击导航抽屉后不会启动

Question

我知道这个问题存在，但答案不适用于我的情况。我有一个包含四个项目的导航抽屉，但是当我点击第一个（我现在正在处理的那个）时，我创建的新 activity 没有打开，我已经查看并尝试了我所做的一切在互联网上找到，但似乎没有任何效果。我是 android 工作室的新手，所以我真的不知道如何解决这个问题。我使用的 android studio 版本是 3.0。这是我的菜单 xml:

<?xml version="1.0" encoding="utf-8"?>
<!--Icons made by http://www.freepik.com
from "https://www.flaticon.com
is licensed by http://creativecommons.org/licenses/by/3.0/-->
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/m1" android:title="Agora Mall"
      android:icon="@drawable/ic_ammunition"/>
<item android:id="@+id/m2" android:title="Downtown Center"
      android:icon="@drawable/ic_ammunition"/>
<item android:id="@+id/m3" android:title="Galeria 360"
      android:icon="@drawable/ic_ammunition"/>
<item android:id="@+id/m4" android:title="Sambil"
      android:icon="@drawable/ic_ammunition"/>
</menu>

这是主要的activityclass代码：

package com.example.arlet.storemaps;

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.view.MenuItem;
import android.view.Window;

public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
    mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.open,  R.string.close);
    mDrawerLayout.addDrawerListener(mToggle);
    mToggle.syncState();
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

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

    switch(item.getItemId()){
        case R.id.m1:
            Intent intent = new Intent(MainActivity.this, AgoraActivity.class);
            startActivity(intent);
            return true;
    }

    return super.onOptionsItemSelected(item);
}

}

Answer 1

您必须为抽屉式导航菜单实施 onNavigationItemSelected()。
onOptionsItemSelected() 与工具栏选项菜单项有关。
如果您创建一个新项目并选择

，您可以找到所有必要的代码

Navigation Drawer Activity

作为您的 MainActivity 的类型。

Answer 2

您可以通过以下方式处理导航抽屉项目点击：

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {

        // This method will trigger on item Click of navigation menu
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {

            //Check to see which item was being clicked and perform appropriate action
            switch (menuItem.getItemId()) {
                //Replacing the main content with ContentFragment Which is our Inbox View;
                case R.id.m1:
                    Intent intent = new  Intent(MainActivity.this, AgoraActivity.class);
                    startActivity(intent);
                    return true;
                    break;
                case R.id.m2:

                    break;
                case R.id.m3:

                    break;
                case R.id.m4:

                    break;

            }


            menuItem.setChecked(true);

            return true;
        }
    });

Answer 3

您必须实施 NavigationView.OnNavigationItemSelectedListener 抽屉项目才能完美运行

将此添加到您的 class 声明中

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
// then overide this method to
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {        
        int id = item.getItemId();
        switch(id){
            case R.id.m1:
                Intent intent = new Intent(MainActivity.this, AgoraActivity.class);
                startActivity(intent);
                return true;
            //other cases goes here
        }
        return super.onOptionsItemSelected(item);
    }
    //you might want to ovewrite this method too
    @Override
    public void onBackPressed() {
        if (mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
            mDrawerLayout.closeDrawer(GravityCompat.START);
        } else {
        super.onBackPressed();
    }
}

新 activity 在点击导航抽屉后不会启动

new activity won't start after clicked navigation drawer

android

android-studio

android-studio-3.0