如何检测导航抽屉是否打开？

Question 1

标题说明了一切。我要做的就是知道导航抽屉是否打开。我在网上进行了很多搜索，找到了该方法，isDrawerOpen(int drawerGravity)但找不到令人满意的答案来说明如何在方法中使用它。如果有人向我解释，我将不胜感激。

提前致谢！

Question 2

假设您已在xml中定义了一个抽屉布局：

DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
...
if(mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
  //drawer is open
}

Question 3

 mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            mDrawerLayout,         /* DrawerLayout object */
            R.drawable.ic_drawer,  /* nav drawer icon to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description */
            R.string.drawer_close  /* "close drawer" description */
            ) {

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            getActionBar().setTitle(mTitle);
        }

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

    // Set the drawer toggle as the DrawerListener
    mDrawerLayout.setDrawerListener(mDrawerToggle);

该听众使用：）

Question 4

用：

mDrawerLayout.isDrawerOpen（）方法

例：

    if(mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
        mDrawerLayout.closeDrawer(Gravity.LEFT); //CLOSE Nav Drawer!
    }else{
        mDrawerLayout.openDrawer(Gravity.LEFT); //OPEN Nav Drawer!
    }

Question 5

通过以下方式，您可以发现抽屉处于打开或关闭状态。

 public class YourActivity extends AppCompatActivity implements  DrawerLayout.DrawerListener {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dash_board);

        DrawerLayout drawer=(DrawerLayout)findViewById(R.id.container);
        drawer.setDrawerListener(this);
    }//onCreate()

    @Override
    public void onDrawerOpened(View arg0) {
      //write your code
    }

    @Override
    public void onDrawerClosed(View arg0) {
        //write your code
    }

    @Override
    public void onDrawerSlide(View arg0, float arg1) {
        //write your code
    }

    @Override
    public void onDrawerStateChanged(int arg0) {
        //write your code
    }
}//class

Question 6

shakeJ的答案是正确的，请记住您可以使用onDrawerSlide来触发其他功能……例如，我使用它来更改StatusBar颜色。

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            isOpen = false;
        }

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            isOpen = true;
        }
        public void onDrawerSlide(View drawerView,float slideOffset){
            super.onDrawerSlide(drawerView,slideOffset);
            if(!isOpen){
                setStatusBarColor("#00102b");
            }
            if(isOpen){
                setStatusBarColor("#EFEFF0");
            }
        }

Question 7

检测DrawerLayout打开，关闭，滑动DrawerLayout.DrawerListener

DrawerLayout drawerLayout:
drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
    /**
     * Called when a drawer's position changes.
     *
     * @param slideOffset The new offset of this drawer within its range, from 0-1
     *                    Example when you slide drawer from left to right, slideOffset will increase from 0 - 1 (0 when drawer closed and 1 when drawer display full)
     */
    @Override
    public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {

    }

    @Override
    public void onDrawerOpened(@NonNull View drawerView) {
        // do something when drawer opened
    }

    @Override
    public void onDrawerClosed(@NonNull View drawerView) {
        // do something when drawer closed
    }

    /**
     * Called when the drawer motion state changes. The new state will
     * be one of {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
     */
    @Override
    public void onDrawerStateChanged(int newState) {

    }
});

检查抽屉已打开

if(drawerLayout.isDrawerOpen(GravityCompat.START)) // or  GravityCompat.END

Question 8

该方法在Kotlin中相同。

初始化DrawerLayout视图

val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
检查抽屉是否打开

if(drawerLayout.isDrawerOpen(GravityCompat.START)){ Log.d("Drawer","open") }

如果要在打开或关闭抽屉时自动采取措施，则可以执行以下操作。

在您的主要活动中，创建一个内部类，该内部类是DrawerLayout.DrawerListener的子类。DrawerLayout类实现DrawerListener接口。

inner class CustomDrawer : DrawerLayout.DrawerListener{
  override fun onDrawerStateChanged(newState: Int) {
  }

  override fun onDrawerSlide(drawerView: View, slideOffset: Float) {
    imm.hideSoftInputFromWindow(drawerView?.getWindowToken(), 0)
  }

  override fun onDrawerClosed(drawerView: View) {
    imm.hideSoftInputFromWindow(drawerView?.getWindowToken(), 0)
  }

  override fun onDrawerOpened(drawerView: View) {
    imm.hideSoftInputFromWindow(drawerView?.getWindowToken(), 0)
  }
}

将动作放在要使用的功能中。在我的示例中，如果用户与导航抽屉进行交互，则我将关闭软键盘。在您的主要活动中这样声明InputMethodManager：

var imm: InputMethodManager = this.getSystemService(Activity.INPUT_METHOD_SERVICE)
将您的自定义DrawerListener添加到抽屉布局（我将其放在onCreate方法中）

var drawerListener = CustomDrawer() drawerLayout.addDrawerListener(drawerListener)

Question 9

可能是，我迟到了，但是我可以分享新的更新信息。在给定的代码中，我在onclick函数中设置了打开/关闭抽屉。如果抽屉是打开的，那么它将被关闭，否则将打开。此解决方案基于RXava DrawerLayout (androidx.drawerlayout.widget.DrawerLayout)。在我的代码中，我从右到左打开抽屉式布局。

 @Override
    public void onClick(View view) {

  if (drawerLayout.isDrawerVisible(GravityCompat.END)) {
                    drawerLayout.closeDrawer(GravityCompat.END);
  }else {
                    drawerLayout.openDrawer(GravityCompat.END);
  }

}

注意：如果从右侧打开抽屉式布局，请使用“ GravityCompat.END”，从左侧打开，而不是使用“ GravityCompat.START”。享受编码。