Question

尝试使用tutsplus教程实现导航抽屉，但导航抽屉不起作用。切换按钮未显示。使用两个变量mDrawerLayout和mActionBarDrawToggle实现抽屉布局。

public class MainActivity extends AppCompatActivity {

    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle mActionBarDrawToggle;
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mActionBarDrawToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_opened, R.string.drawer_closed) {


            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (getSupportActionBar() != null)
                    getSupportActionBar().setTitle(R.string.drawer_opened);
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if (getSupportActionBar() != null)
                    getSupportActionBar().setTitle(R.string.drawer_closed);

            }


        };
        mDrawerLayout.setDrawerListener(mActionBarDrawToggle);


        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }



    @Override
    public void onPostCreate(Bundle savedInstanceState) {

        super.onPostCreate(savedInstanceState);
        mActionBarDrawToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mActionBarDrawToggle.onConfigurationChanged(newConfig);
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.

        return mActionBarDrawToggle.onOptionsItemSelected(item);

    }

Answer 1

您的问题是您没有提供ActionBarDrawerToggle工具栏。

在代码中查看此行

mActionBarDrawToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_opened, R.string.drawer_closed);

您应该将工具栏作为参数传递，如下所示

mActionBarDrawToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.drawer_opened, R.string.drawer_closed)

导航抽屉不工作tutsplus教程

1 个答案: