导航抽屉图标替换为后退图标时出错

Question

我刚刚创建了一个自定义导航抽屉，它运行良好，但我找到了这个图标而不是导航抽屉图标 我怎么能解决这个案子，因为这是我的 主要活动

package abtech.waiteriano.com.dineinpos;

import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

import abtech.waiteriano.com.dineinpos.adapters.CustomDrawerAdapter;
import abtech.waiteriano.com.dineinpos.fragments.FragmentOne;
import abtech.waiteriano.com.dineinpos.fragments.FragmentThree;
import abtech.waiteriano.com.dineinpos.fragments.FragmentTwo;
import abtech.waiteriano.com.dineinpos.gettersandsetter.DrawerItem;

public class MainActivity extends AppCompatActivity {

    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    private CharSequence mDrawerTitle;
    private CharSequence mTitle;
    CustomDrawerAdapter adapter;

    List<DrawerItem> dataList;

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

        // Initializing
        dataList = new ArrayList<DrawerItem>();
        mTitle = mDrawerTitle = getTitle();
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

//        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
//                GravityCompat.START);

        // Add Drawer Item to dataList
        dataList.add(new DrawerItem("Order Staion", R.mipmap.ic_launcher));
        dataList.add(new DrawerItem("Delivery", R.mipmap.ic_launcher));
        dataList.add(new DrawerItem("Example 1", R.mipmap.ic_launcher));
        dataList.add(new DrawerItem("Example 2", R.mipmap.ic_launcher));

        adapter = new CustomDrawerAdapter(this, R.layout.custom_drawer_item,
                dataList);

        mDrawerList.setAdapter(adapter);

        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(
                this,
                mDrawerLayout,
                R.drawable.list,  /* nav drawer icon to replace 'Up' caret */
                R.string.drawer_open,
                R.string.drawer_close) {
            public void onDrawerClosed(View view) {
                getSupportActionBar().setTitle(mTitle);
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView) {
                getSupportActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu();
            }
        };

        mDrawerLayout.setDrawerListener(mDrawerToggle);


        if (savedInstanceState == null) {
            SelectItem(0);
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
//        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void SelectItem(int possition) {

        Fragment fragment = null;
        Bundle args = new Bundle();
        switch (possition) {
            case 0:
                fragment = new FragmentOne();
                args.putString(FragmentOne.ITEM_NAME, dataList.get(possition)
                        .getItemName());
                args.putInt(FragmentOne.IMAGE_RESOURCE_ID, dataList.get(possition)
                        .getImgResID());
                break;
            case 1:
                fragment = new FragmentTwo();
                args.putString(FragmentTwo.ITEM_NAME, dataList.get(possition)
                        .getItemName());
                args.putInt(FragmentTwo.IMAGE_RESOURCE_ID, dataList.get(possition)
                        .getImgResID());
                break;
            case 2:
                fragment = new FragmentThree();
                args.putString(FragmentThree.ITEM_NAME, dataList.get(possition)
                        .getItemName());
                args.putInt(FragmentThree.IMAGE_RESOURCE_ID, dataList.get(possition)
                        .getImgResID());
                break;
            case 3:
                fragment = new FragmentOne();
                args.putString(FragmentOne.ITEM_NAME, dataList.get(possition)
                        .getItemName());
                args.putInt(FragmentOne.IMAGE_RESOURCE_ID, dataList.get(possition)
                        .getImgResID());
        }

        fragment.setArguments(args);
        FragmentManager frgManager = getFragmentManager();
        frgManager.beginTransaction().replace(R.id.content_frame, fragment)
                .commit();

        mDrawerList.setItemChecked(possition, true);
        setTitle(dataList.get(possition).getItemName());
        mDrawerLayout.closeDrawer(mDrawerList);

    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getSupportActionBar().setTitle(mTitle);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggles
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // The action bar home/up action should open or close the drawer.
        // ActionBarDrawerToggle will take care of this.
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }

        return false;
    }

    private class DrawerItemClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                                long id) {
            SelectItem(position);

        }
    }

}

............................................... ........................

Answer 1

只需从代码中删除getSupportActionBar().setHomeButtonEnabled(true)即可。

仅供参考，在ActionBarDrawerToggle中，您使用的是启动器图标R.mipmap.ic_launcher，而不是抽屉图标。

试试这个：

    ......................
    ...........................
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    mDrawerToggle = new ActionBarDrawerToggle(
                        this,                         
                        mDrawerLayout,                
                        R.drawable.YOUR_DRAWER_ICON,  /* nav drawer icon to replace 'Up' caret */
                        R.string.drawer_open,         
                        R.string.drawer_close) {
        public void onDrawerClosed(View view) {
            getSupportActionBar().setTitle(mTitle);
            invalidateOptionsMenu(); 
        }

        public void onDrawerOpened(View drawerView) {
            getSupportActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu(); 
        }
    };

    mDrawerLayout.setDrawerListener(mDrawerToggle);

    ...............................
    .............................................

希望这会有所帮助〜