0

即使在编码之后，我也无法在预览中看到切换按钮。我错过了什么吗？

我想在该切换按钮上实现导航抽屉，它将从右到左打开，然后再次单击它将关闭。

下面是我的代码：

public class entryActivity extends ActionBarActivity {

    private String[] mMenuItems;
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle actionBarDrawerToggle;
    private CharSequence mDrawerTitle;
    private CharSequence mTitle;


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

        //https://developer.android.com/training/implementing-navigation/nav-drawer.html
        mMenuItems = getResources().getStringArray(R.array.menu_items);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        // Set the adapter for the list view
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, mMenuItems));
        ActionBar actionBar = getSupportActionBar();

        actionBar.setHomeButtonEnabled(true);


        actionBarDrawerToggle = new ActionBarDrawerToggle(
                this,
                mDrawerLayout,
                R.string.open,
                R.string.close
        ){
            public void onDrawerClosed(View view) {
                super.onDrawerClosed(view);
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }
        };

        mDrawerLayout.setDrawerListener(actionBarDrawerToggle);
    }


    @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.
        int id = item.getItemId();

        if(actionBarDrawerToggle.onOptionsItemSelected(item)){
            return true;
        }

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}

在此处输入图像描述

4

3 回答 3

0

在 onCreate 方法中设置它。

actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
于 2015-05-05T11:24:14.007 回答
0

尝试setDisplayHomeAsUpEnabled()按照您的方式添加setHomeButtonEnabled()

对于汉堡菜单选项：http ://codetheory.in/android-navigation-drawer/

于 2015-05-05T11:24:40.137 回答
0

您需要致电actionBarDrawerToggle.syncState()：

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

查看完整示例：https ://developer.android.com/training/implementing-navigation/nav-drawer.html

于 2015-05-05T11:39:42.673 回答