java - 如何使我的 ActionBar DrawerToggle 按钮正常工作？

Question

public class MainActivity extends ActionBarActivity {
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.drawable.ic_launcher, R.string.drawer_open, R.string.drawer_close) {
            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);

                invalidateOptionsMenu();
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                Log.d(TAG, "onDrawerClosed: " + getTitle());

                invalidateOptionsMenu();
            }
        };

        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }

这里我使用了DrawerToggle并为其定义了一个函数，但它不起作用。

我应该在 invalidateOptionsMenu() 方法中定义什么？

Answer 1

用于启用操作栏切换按钮

// enabling action bar app icon and behaving it as toggle button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
        R.drawable.drawer, //nav menu toggle icon
        R.string.app_name // nav drawer open - description for accessibility
    ) {
    public void onDrawerClosed(View view) {
        // calling onPrepareOptionsMenu() to show action bar icons
        invalidateOptionsMenu();
        super.onDrawerClosed(view);
    }

    public void onDrawerOpened(View drawerView) {
        // calling onPrepareOptionsMenu() to hide action bar icons
        invalidateOptionsMenu();
        super.onDrawerOpened(drawerView);
    }
};

mDrawerLayout.setDrawerListener(mDrawerToggle);


/**
 * When using the ActionBarDrawerToggle, you must call it during
 * onPostCreate() and onConfigurationChanged()...
 */

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

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

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // toggle nav drawer on selecting action bar app icon/title
        /*if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }*/
        switch (item.getItemId()) {
        case android.R.id.home:
             if(mDrawerLayout.isDrawerOpen(mDrawer))
             {
                 mDrawerLayout.closeDrawer(mDrawer);
             }
             else {
                 mDrawerLayout.openDrawer(mDrawer);
            }
            break;

        default:
            break;
        }
        return super.onOptionsItemSelected(item);

    }

/* *
     * Called when invalidateOptionsMenu() is triggered
     */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // if nav drawer is opened, hide the action items
    //boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawer);
    //menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}