如何在 Android 的不同活动中调用 FrameLayout 滑块

Question

我有 3 个活动，比如 first_activity,second_activity,third_activity。我使用 FrameLayout 打开了一个滑块。！

现在我想通过点击所有三个活动都可用的按钮打开滑块。

所以现在就像在测试 1 中一样，左侧有一个按钮，与我在所有三个活动中的方式相同，所以点击我想打开滑块。

这是我的滑块代码

public class MainActivity extends Activity {

    // Within which the entire activity is enclosed
    private DrawerLayout mDrawerLayout;

    // ListView represents Navigation Drawer
    private ListView mDrawerList;

    // ActionBarDrawerToggle indicates the presence of Navigation Drawer in the
    // action bar
    private ActionBarDrawerToggle mDrawerToggle;

    // Title of the action bar
    private String mTitle = "";

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitle = "Test App";
        getActionBar().setTitle(mTitle);

        // Getting reference to the DrawerLayout
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.drawer_list);

        // Getting reference to the ActionBarDrawerToggle
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, R.string.drawer_open,
                R.string.drawer_close) {

            /** Called when drawer is closed */
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu();
            }

            /** Called when a drawer is opened */
            public void onDrawerOpened(View drawerView) {
                // getActionBar().setTitle("Approval Status");
                invalidateOptionsMenu();
            }
        };

        // Setting DrawerToggle on DrawerLayout
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        // Creating an ArrayAdapter to add items to the listview mDrawerList
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getBaseContext(), R.layout.drawer_list_item, getResources()
                        .getStringArray(R.array.menus));

        // Setting the adapter on mDrawerList
        mDrawerList.setAdapter(adapter);

        // Enabling Home button
        getActionBar().setHomeButtonEnabled(true);

        // Enabling Up navigation
        getActionBar().setDisplayHomeAsUpEnabled(true);

        // Setting item click listener for the listview mDrawerList
        mDrawerList.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // Getting an array of rivers
                String[] menuItems = getResources().getStringArray(
                        R.array.menus);

                // Currently selected river
                mTitle = menuItems[position];

                // Creating a fragment object
                // WebViewFragment rFragment = new WebViewFragment();
                //
                // // Passing selected item information to fragment
                // Bundle data = new Bundle();
                // data.putInt("position", position);
                // data.putString("url", getUrl(position));
                // rFragment.setArguments(data);
                //
                //
                // // Getting reference to the FragmentManager
                // FragmentManager fragmentManager = getFragmentManager();
                //
                // // Creating a fragment transaction
                // FragmentTransaction ft = fragmentManager.beginTransaction();
                //
                // // Adding a fragment to the fragment transaction
                // ft.replace(R.id.content_frame, rFragment);
                //
                // // Committing the transaction
                // ft.commit();

                // Closing the drawer
                mDrawerLayout.closeDrawer(mDrawerList);

            }
        });
    }

    protected String getUrl(int position) {
        switch (position) {
        case 0:
            return "";
        case 1:
            return "";
        case 2:
            return "";
        case 3:
            return "";
        case 4:
            return "";
        case 5:
            return "";
        case 6:
            return "";
        default:
            return "";
        }
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mDrawerToggle.syncState();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /** Called whenever we call invalidateOptionsMenu() */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);

        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

Answer 1

除非您有用于该活动的抽屉，否则您无法在其他活动中打开抽屉。

我建议你使用片段。

在决定你的设计之前，我建议你先看看这个链接

http://developer.android.com/design/patterns/navigation.html

在oncreate

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

在onItemClick 拨打getUrl(position)

然后在getUrl

  protected String getUrl(int position) {

    FragmentTransaction fragTran = getFragmentManager()
                                 .beginTransaction();

    switch (position) {
    case 0:
            // make one a Fragment
            fragTran.replace(R.id.content_frame, fragment1);
        break;
    case 1:
           // second fragment
           fragTran.replace(R.id.content_frame, fragment2);

        break
    case 2:
          // third fragment
          fragTran.replace(R.id.content_frame, fragment3);  
        break;
    }
    // Commit the transaction and close the drawer
    fragTran.commit();  
    mDrawerList.setItemChecked(position, true);
    mDrawerLayout.closeDrawer(drawerList);

 }  

例子：

public class Fragment1 extends Fragment {
    String[] titles={"A","B","C"};
    @Override
    public View onCreateView(
            LayoutInflater inflater, 
            ViewGroup container, 
            Bundle savedInstanceState){
        View rootView = inflater.inflate(R.layout.fragment1, container, false);
        return rootView;
    }   
}

MainActivity.java

public class MainActivity extends Activity {

    // Fields -----------------------------------------------------------------
    private DrawerLayout drawerLayout;
    private ListView drawerList;
    private ActionBarDrawerToggle drawerToggle;
    private MenuListAdapter menuAdapter;
    private int[] icons;
    private Fragment fragment1;
    private Fragment fragment2;
    private Fragment fragment3;
    private CharSequence drawerTitle;
    private CharSequence title;
    private final String[] titles = new String[]{
            "Title Fragment #1",
            "Title Fragment #2",
            "Title Fragment #3"
    };
    private final String[] subtitles = new String[]{
            "Subtitle Fragment #1",
            "Subtitle Fragment #2",
            "Subtitle Fragment #3"
    };

    // Lifecycle Callbacks ----------------------------------------------------
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        // Base implemenation
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Instantiate the fragments
        fragment1 = new Fragment1();
        fragment2 = new Fragment2();
        fragment3 = new Fragment3();

        // Get the title from this activity
        title = drawerTitle = getTitle();

        // Get the icons from the drawables folder
        icons = new int[]{
                R.drawable.action_about,
                R.drawable.action_settings,
                R.drawable.collections_cloud
        };

        // Get the drawer layout from the XML file and the ListView inside it
        drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
        drawerList = (ListView)findViewById(R.id.listview_drawer);

        // Set a custom shadow over that overlays the main content
        // when the drawer opens
        drawerLayout.setDrawerShadow(
                R.drawable.drawer_shadow, GravityCompat.START);

        // Pass the string arrays to the MenuListAdapter, set the drawer
        // list adapter to it and set up its click listener
        menuAdapter = new MenuListAdapter(
                MainActivity.this, titles, subtitles, icons);
        drawerList.setAdapter(menuAdapter);
        drawerList.setOnItemClickListener(new DrawerItemClickListener());

        // Enable the action bar to have up navigation
        getActionBar().setHomeButtonEnabled(true);
        //getActionBar().setDisplayHomeAsUpEnabled(true);

        // Allow the the action bar to toggle the drawer
        drawerToggle = new ActionBarDrawerToggle(
                this,
                drawerLayout,
                R.drawable.ic_drawer,
                R.string.drawer_open,
                R.string.drawer_close){

            public void onDrawerClosed(View view){
                super.onDrawerClosed(view);
            }
            public void onDrawerOpened(View view){
                getSupportActionBar().setTitle(drawerTitle);
                super.onDrawerOpened(view);
            }
        };
        drawerLayout.setDrawerListener(drawerToggle);

        // If this is the first time opening this activity,
        // start with loading fragment #1
        if (savedInstanceState == null){
            selectItem(0);
        }       

    }

    // Methods ----------------------------------------------------------------
    @Override
    public boolean onOptionsItemSelected(MenuItem item){

        // If the user has pressed the action bar icon
        if (item.getItemId() == android.R.id.home){

            // If the drawer is open, close it; vice versa
            if (drawerLayout.isDrawerOpen(drawerList)){
                drawerLayout.closeDrawer(drawerList);
            } else {
                drawerLayout.openDrawer(drawerList);
            }
        }

        // Finish by letting the super class do the rest
        return super.onOptionsItemSelected(item);

    }
    @Override
    protected void onPostCreate(Bundle savedInstanceState){

        // Call the super implementation and synchronize the drawer
        super.onPostCreate(savedInstanceState);
        drawerToggle.syncState();

    }
    @Override
    public void onConfigurationChanged(Configuration newConfig){

        // Call the super implemenation on this activity
        // and the drawer toggle object
        super.onConfigurationChanged(newConfig);
        drawerToggle.onConfigurationChanged(newConfig);

    }
    private void selectItem(int position){

        // Create a new fragment transaction and start it
        FragmentTransaction fragTran = getFragmentManager()
                                       .beginTransaction();

        // Locate the position selected replace the content view
        // with the fragment of the number selected
        switch (position){
            case 0:{
                fragTran.replace(R.id.content_frame, fragment1);
                break;
            }
            case 1:{
                fragTran.replace(R.id.content_frame, fragment2);
                break;
            }
            case 2:{
                fragTran.replace(R.id.content_frame, fragment3);
                break;
            }
        }

        // Commit the transaction and close the drawer
        fragTran.commit();
        drawerList.setItemChecked(position, true);
        drawerLayout.closeDrawer(drawerList);

    }
    public void setTitle(CharSequence title){

        // Save the passed in title and set the action bar title
        this.title = title;
        getActionBar().setTitle(title);

    }

    // Classes ----------------------------------------------------------------
    private class DrawerItemClickListener 
    implements ListView.OnItemClickListener{

        @Override
        public void onItemClick(
                AdapterView<?> parent, 
                View view, 
                int position,
                long id) {

            // When clicked, select open the appropriate fragment
            selectItem(position);

        }

    }

}

Fragment2.java

public class Fragment2 extends Fragment {
    @Override
    public View onCreateView(
            LayoutInflater inflater,
            ViewGroup container,
            Bundle savedInstanceState){
        View rootView = inflater.inflate(R.layout.fragment2, container, false);
        return rootView;
    }
}

Fragment3.java

public class Fragment3 extends Fragment {
    @Override
    public View onCreateView(
            LayoutInflater inflater,
            ViewGroup container,
            Bundle savedInstanceState){
        View rootView = inflater.inflate(R.layout.fragment3, container, false);
        return rootView;
    }
}

activity_main.xml

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout 
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <ListView 
        android:id="@+id/listview_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#111"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"/>

</android.support.v4.widget.DrawerLayout>

drawer_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/darker_gray"
    android:orientation="horizontal"
    style="?attr/dropdownListPreferredItemHeight" >

    <ImageView
        android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"/>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="center_vertical|left"
        android:orientation="vertical">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:singleLine="true"
            style="?attr/spinnerDropDownItemStyle"/>
        <TextView 
            android:id="@+id/subtitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:singleLine="true"
            style="?attr/spinnerDropDownItemStyle"/>

    </LinearLayout>    

</LinearLayout>

拥有framen1.xml、framgent2.xml和fragment3.xml并自定义你想要的方式。