android-navigation 抽屉在活动更改时未打开

Posted 2023-04-18

【中文标题】android-navigation 抽屉在活动更改时未打开

【英文标题】：android-navigation drawer not open on activity change

【发布时间】：2014-11-17 05:57:10

【问题描述】：

这很奇怪，我花了最后 5 个小时在上面，没有任何效果。问题是这样的，当我从活动 a 转到活动 b，然后按返回按钮并返回活动 a 时，导航抽屉没有打开。 这是代码：

public abstract class DrawerActivity extends ActionBarActivity 
static LinearLayout fullLayout;
static FrameLayout actContent;
static DrawerLayout mDrawerLayout;
static ListView mDrawerList;
static ActionBarDrawerToggle mDrawerToggle;
static LinearLayout mDrawer;
List<HashMap<String, String>> mList;
SimpleAdapter mAdapter;
final private String COUNTRY = "country";
final private String FLAG = "flag";
final private String COUNT = "count";
@Override
public void setContentView(final int layoutResID) 
    fullLayout= (LinearLayout) getLayoutInflater().inflate(R.layout.act_layout, null); // Your base layout here
    actContent= (FrameLayout) fullLayout.findViewById(R.id.act_content);
    getLayoutInflater().inflate(layoutResID, actContent, true); // Setting the content of layout your provided to the act_content frame
    super.setContentView(fullLayout);
        makelist();
    
        mTitle = (String) getTitle();

        // Getting a reference to the drawer listview
        mDrawerList = (ListView) findViewById(R.id.drawer_list);

        // Getting a reference to the sidebar drawer ( Title + ListView )
        mDrawer = (LinearLayout) findViewById(R.id.drawer);

        // Each row in the list stores country name, count and flag
        mList = new ArrayList<HashMap<String, String>>();
        for (int i = 0; i < mCountries.length; i++) 
            HashMap<String, String> hm = new HashMap<String, String>();
            hm.put(COUNTRY, mCountries[i]);
            hm.put(FLAG, Integer.toString(mFlags[i]));
            mList.add(hm);
        
        String[] from =  FLAG, COUNTRY ;
        int[] to =  R.id.flag, R.id.country ;
        mAdapter = new SimpleAdapter(this, mList, R.layout.drawer_layout, from,to);

        // Getting reference to DrawerLayout
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.drawable.ic_navigation_drawer, R.string.drawer_open,R.string.drawer_close) 

            /** Called when drawer is closed */
            public void onDrawerClosed(View view) 
                highlightSelectedCountry();
                supportInvalidateOptionsMenu();
            

            /** Called when a drawer is opened */
            public void onDrawerOpened(View drawerView) 
                supportInvalidateOptionsMenu();
            

            @Override
            public boolean onOptionsItemSelected(MenuItem item) 
                if (item != null && item.getItemId() == android.R.id.home) 
                    if (mDrawerLayout.isDrawerOpen(Gravity.RIGHT)) 
                        mDrawerLayout.closeDrawer(Gravity.RIGHT);
                        Log.v("this","close");
                     else 
                        mDrawerLayout.openDrawer(Gravity.RIGHT);
                    
                
                return false;
            


        ;

        // Setting event listener for the drawer
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        mDrawerList.setAdapter(mAdapter);
    
    public static boolean open() 
        if (mDrawerLayout.isDrawerOpen(mDrawer)) 
             mDrawerLayout.closeDrawer(Gravity.RIGHT);
             return true;
          else 
             mDrawerLayout.openDrawer(Gravity.RIGHT);
             return true;
         
    

这是 MainActivity 类：

public class MainActivity extends DrawerActivity implements OnClickListener  

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

    //suppose this is the imageview on the actionbar
        ImageView img=(ImageView)dialogg.findViewById(R.id.img);
        dateup.img(new OnClickListener() 
            @Override
            public void onClick(View v) 
                  DrawerActivity.open();                
            
        );

我要注意一件事，mainActivity 扩展了 DrawerActivity 类。

你能帮我解决这个问题吗？

谢谢你

【问题讨论】：

尝试在onRestart() of ActivityA 中打开抽屉

它可能有效，但我不希望每次有人来活动时都打开它

我试过你说的，当我回到活动a时，它会立即打开和关闭。我删除了 mainactivity 中的所有代码，但同样的情况发生了

将你的 onOptionsItemSelected 方法从 ActionBarDrawerToggle 移到活动类中

您不应该对 UI 组件使用静态属性。尝试使它们成为标准实例属性。

【参考方案1】：

这个

尝试使用 Abstract 类中的方法 open() 并且您使用“mDrawerLayout”，我认为此时它必须为 null

public void onClick(View v) 
     DrawerActivity.open();                

也许你会使用

public void onClick(View v) 
     this.open();                

然后你将使用你当前Activity的open-Method

而且你必须在Activity中实现onClickListener

错误消息会很高兴获得有关错误的更多信息

【讨论】：

感谢回复，我调用 DrawerActivity.open();在 mainAcitivty 上，我确定不是 this.open();没有错误，就是打不开菜单