向(打开/关闭)导航抽屉的活动添加(打开/关闭)按钮

Question

我目前正在从android站点了解导航抽屉,我正在使用他们的示例http://developer.android.com/training/implementing-navigation/nav-drawer.html

我想要的是在MainActivity其中添加一个能够打开的按钮NavigationDrawer.我需要以编程方式,而不是XML.我怎样才能做到这一点？

Answer 1

创建一个MainActivity包含drawerLayout 的方法.

public void open()
{
    mDrawerLayout.openDrawer(Gravity.LEFT);
}

来自你的片段在oncreateView()方法中你想要新的Button按编程方式在你的Root膨胀布局中添加Button.你的片段有按钮,
我修改了片段试试

 public static class PlanetFragment extends Fragment {
    public static final String ARG_PLANET_NUMBER = "planet_number";

    public PlanetFragment() {
        // Empty constructor required for fragment subclasses
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
        int i = getArguments().getInt(ARG_PLANET_NUMBER);
        String planet = getResources().getStringArray(R.array.planets_array)[i];

        int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                        "drawable", getActivity().getPackageName());
        ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
        getActivity().setTitle(planet);
        RelativeLayout root=(RelativeLayout)rootView.findViewById(R.id.root);
        Button button=new Button(getActivity());            
        LayoutParams params=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
        button.setLayoutParams(params);
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        button.setText("openDrawer");
        root.addView(button);

        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                ((MainActivity)getActivity()).open();
            }
        });
        return rootView;
    }
    }
 }

您可以在片段中尝试此代码..

Answer 2

在onCreate(Bundle)方法中创建Button :

Button button = new Button(this);

找到你的DrawerLayout:

mDrawerLayout = (DrawerLayout) findViewById(R.id.my_drawer_layout_id);

OnClickListener在此按钮上设置:

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        mDrawerLayout.openDrawer(Gravity.LEFT);   
    }
)

这会给你一个空的抽屉.如果您View想要放入抽屉内,请更换:

mDrawerLayout.openDrawer(Gravity.LEFT);

有:

mDrawerLayout.openDrawer(myCustomView);

如果您希望按钮切换抽屉(如果抽屉打开则关闭抽屉,或者如果抽屉关闭则打开抽屉)使用以下内容OnClickListener:

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        if (mDrawerLayout.isDrawerOpen(Gravity.LEFT)) {
            mDrawerLayout.closeDrawer(Gravity.LEFT);
        } else {
            mDrawerLayout.openDrawer(Gravity.LEFT); 
        }  
    }
)

如果您使用的是自定义视图,请使用以下命令OnClickListener:

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        if (mDrawerLayout.isDrawerOpen(myCustomView)) {
            mDrawerLayout.closeDrawer(myCustomView);
        } else {
            mDrawerLayout.openDrawer(myCustomView); 
        }  
    }
)