如何使Cardview消失？

时间：2019-06-05 07:01:19

标签： android android-fragments navigation-drawer android-cardview

当我单击导航抽屉中的任何菜单项时，菜单项的内容将显示在卡的下方。卡应该消失，然后在其位置上显示菜单项的内容。菜单项的内容以片段形式编写。有人可以帮我解决吗？在下面附加代码...

这是MainActivity Java文件

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
    actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close);
    drawerLayout.setDrawerListener(actionBarDrawerToggle);
    ////////////////////////////////////////////////////////////////////
    navigationView = (NavigationView)findViewById(R.id.navigation_view);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            switch (menuItem.getItemId())
            {
                case R.id.menu_profile:
                    fragmentTransaction=getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new ProfileFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Profile");
                    menuItem.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;
                case R.id.menu_language:
                    fragmentTransaction=getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new LanguageFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Set Language");
                    menuItem.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;
                case R.id.menu_tutorial:
                    fragmentTransaction=getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new TutorialFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Tutorial");
                    menuItem.setChecked(true);
                    drawerLayout.closeDrawers();
                    break;

            }
            return true;
        }
    });
}

这是XML文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:id="@+id/drawer_layout"
    >
     <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
         android:id="@+id/main_container">
        <include
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            layout="@layout/toolbar_layout"
            />
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:id="@+id/card_fixed"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            card_view:cardCornerRadius="10dp"
            card_view:cardBackgroundColor="@android:color/background_light">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/card_fixed_heading"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:text="Sensor Details"
                    android:fontFamily="serif"
                    android:textSize="24sp"
                    android:textStyle="bold"
                    android:textColor="#000"/>
                <TextView
                    android:id="@+id/card_fixed_details"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:padding="5dp"
                    android:text="pH Level - \nTemperature - \nMoisture -"
                    android:fontFamily="serif"
                    android:textSize="16sp"
                    android:textColor="#000"/>
            </LinearLayout>
        </android.support.v7.widget.CardView>
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:id="@+id/card_notification"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            card_view:cardCornerRadius="10dp"
            card_view:cardBackgroundColor="@android:color/background_light">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/card_notification_heading"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Water The Plants!"
                    android:fontFamily="serif"
                    android:textSize="24sp"
                    android:layout_gravity="center"
                    android:textStyle="bold"
                    android:textColor="#000"/>
                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Done"
                    android:layout_marginTop="5dp"
                    android:layout_marginBottom="5dp"
                    android:textStyle="bold"
                    android:fontFamily="serif"
                    android:layout_gravity="center_horizontal"
                    />
            </LinearLayout>
        </android.support.v7.widget.CardView>
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:id="@+id/card_prediction"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            card_view:cardCornerRadius="10dp"
            card_view:cardBackgroundColor="@android:color/background_light">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/card_market_heading"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Market Prediction"
                    android:fontFamily="serif"
                    android:textSize="24sp"
                    android:layout_gravity="center"
                    android:textStyle="bold"
                    android:textColor="#000"/>
                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Click Here!"
                    android:layout_marginTop="5dp"
                    android:layout_marginBottom="5dp"
                    android:textStyle="bold"
                    android:fontFamily="serif"
                    android:layout_gravity="center_horizontal"
                    android:onClick="marketPrediction"
                    />
            </LinearLayout>
        </android.support.v7.widget.CardView>
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:id="@+id/card_pest"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="5dp"
            card_view:cardCornerRadius="10dp"
            card_view:cardBackgroundColor="@android:color/background_light">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/card_pest_heading"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Pest Details"
                    android:fontFamily="serif"
                    android:textSize="24sp"
                    android:layout_gravity="center"
                    android:textStyle="bold"
                    android:textColor="#000"/>
                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Click Here!"
                    android:layout_marginTop="5dp"
                    android:layout_marginBottom="5dp"
                    android:textStyle="bold"
                    android:fontFamily="serif"
                    android:layout_gravity="center_horizontal"
                    android:onClick="pestDetails"
                    />
            </LinearLayout>
        </android.support.v7.widget.CardView>
     </LinearLayout>
    <android.support.design.widget.NavigationView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/navigation_view"
        android:layout_gravity="start"
        app:menu="@menu/drawer_menu"
        app:headerLayout="@layout/navigation_drawer_header"
        >
    </android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>

2 个答案:

答案 0 :(得分：0)

每个Android View都有出现和消失的能力。只需在Java代码中使用setVisibility()并将其设置为View.GONE

示例：

CardView cardView1 = findViewById(R.id.card_pest);

cardView1.setVisibility(View.GONE)

答案 1 :(得分：0)

  1. 您需要获取CardView的ID并将其存储在变量中。

    CardView cardView = findViewById（R.id.card_fixed）;

  2. 这样做之后，您需要setVisibility至GONE来隐藏CardView所在的位置。

    cardView.setVisibility（View.GONE）;

  3. 每当您setVisibility到View时，都有三种选择，

View.VISIBLE，View.INVISIBLE，View.GONE。

  1. 您可以setVisibility(View.VISIBLE)使CardView或其他任何Views出现。

  2. View.INVISIBLE占用空间用于布局，但是View.GONE不会占用任何空间。

（由于某些原因，我无法格式化代码以使CardView对GONE可见。）

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