如何使用图像按钮从片段中打开 activity？

Question

我有一个包含四个不同片段的导航抽屉。在 Home Fragment Dashboard 上，我有八个不同的图像按钮，我想打开一个新的 activity I.E.当您单击图像按钮 TM 时，我希望它打开 TM activity。我也在用科特林。

我在 YouTube 上观看了很多视频和论坛，google 和 none 似乎对我正在做的事情有用。

// Dashboard.kt is where I have my ImageButtons, where I want each button to open a new activity.
package com.example.militarymainenance

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment


class Dashboard : Fragment() {
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_dashboard, container, false)
    }
}

// fragment_dashboard.xml is where I have my ImageButtons, where I want each button to open a new activity.

 <?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView
    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=".Dashboard">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">



        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="140dp"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="32dp"
            android:layout_marginRight="20dp">


            <ImageView
                android:id="@+id/txtdashboard"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:src="@drawable/dashboard3"
                android:textAlignment="center"
                android:textColor="#FFF" />


        </RelativeLayout>

        <GridLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:rowCount="3"
            android:columnCount="2"
            android:alignmentMode="alignMargins">


            <androidx.cardview.widget.CardView

                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:cardBackgroundColor="@color/material_on_surface_stroke"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardElevation="6dp"
                app:cardCornerRadius="12dp"
                android:layout_margin="12dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"
                    android:padding="16dp"
                    android:gravity="center">

                    <ImageButton
                        android:id="@+id/card1"
                        android:src="@drawable/folder3"
                        android:scaleType="centerCrop"
                        android:layout_width="130dp"
                        android:layout_height="130dp"/>

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="12dp"
                        android:textColor="@color/white"
                        android:text="@string/tm_s"/>


                </LinearLayout>

            </androidx.cardview.widget.CardView>

            <androidx.cardview.widget.CardView

                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardBackgroundColor="@color/material_on_surface_stroke"
                app:cardElevation="6dp"
                app:cardCornerRadius="12dp"
                android:layout_margin="12dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"
                    android:padding="16dp"
                    android:gravity="center">

                    <ImageButton
                        android:id="@+id/card2"
                        android:src="@drawable/circuit3"
                        android:scaleType="centerCrop"
                        android:layout_width="130dp"
                        android:layout_height="130dp"/>

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="12dp"
                        android:textColor="@color/white"
                        android:text="@string/schematics"/>


                </LinearLayout>

            </androidx.cardview.widget.CardView>

            <androidx.cardview.widget.CardView

                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardBackgroundColor="@color/material_on_surface_stroke"
                app:cardElevation="6dp"
                app:cardCornerRadius="12dp"
                android:layout_margin="12dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"
                    android:padding="16dp"
                    android:gravity="center">

                    <ImageButton
                        android:id="@+id/card3"
                        android:src="@drawable/parts3"
                        android:scaleType="centerCrop"
                        android:layout_width="130dp"
                        android:layout_height="130dp"/>

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="12dp"
                        android:textColor="@color/white"
                        android:text="@string/parts_cheat_sheet"/>


                </LinearLayout>

            </androidx.cardview.widget.CardView>

            <androidx.cardview.widget.CardView

                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardBackgroundColor="@color/material_on_surface_stroke"
                app:cardElevation="6dp"
                app:cardCornerRadius="12dp"
                android:layout_margin="12dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"
                    android:padding="16dp"
                    android:gravity="center">

                    <ImageButton
                        android:id="@+id/card4"
                        android:src="@drawable/load3"
                        android:scaleType="centerCrop"
                        android:layout_width="130dp"
                        android:layout_height="130dp"/>

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="12dp"
                        android:textColor="@color/white"
                        android:text="@string/generator_load_wiring"/>


                </LinearLayout>

            </androidx.cardview.widget.CardView>

        </GridLayout>

    </LinearLayout>

</androidx.core.widget.NestedScrollView>

// MainActivity.kt which controls my navigation drawer.

package com.example.militarymainenance

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.core.view.GravityCompat
import androidx.fragment.app.Fragment
import com.google.android.material.navigation.NavigationView
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.content_main.*

class MainActivity : AppCompatActivity(),NavigationView.OnNavigationItemSelectedListener {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        val toggle = ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.open,R.string.close)
        toggle.isDrawerIndicatorEnabled = true
        drawerLayout.addDrawerListener(toggle)
        toggle.syncState()

        nav_menu.setNavigationItemSelectedListener(this)

        setToolbarTitle("Dashboard")
        changeFragment(Dashboard())


    }

    override fun onNavigationItemSelected(item: MenuItem): Boolean {
        drawerLayout.closeDrawer(GravityCompat.START)


        when(item.itemId){
            R.id.dashboard -> {
                setToolbarTitle("Dashboard")
                changeFragment(Dashboard())
            }

            R.id.equipment_tracker -> {
                setToolbarTitle("Equipment Tracker")
                changeFragment(Equipment_tracker())
            }

            R.id.service_tracker -> {
                setToolbarTitle("Service Tracker")
                changeFragment(Service_tracker())
            }

            R.id.faults_tracker -> {
                setToolbarTitle("Faults Tracker")
                changeFragment(Faults_tracker())
            }

            R.id.share -> {
                setToolbarTitle("Service Tracker")
                changeFragment(Service_tracker())
            }

            R.id.rate_us -> {
                setToolbarTitle("Faults Tracker")
                changeFragment(Faults_tracker())
            }
        }
        return true
    }

    fun setToolbarTitle(title:String){
        supportActionBar?.title = title
    }

    fun changeFragment(frag:Fragment){
        val fragment = supportFragmentManager.beginTransaction()
        fragment.replace(R.id.fragment_container,frag).commit()
    }



}

// activity_main.xml which controls my navigation bar

    <?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:id="@+id/drawerLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#515050"
    tools:context=".MainActivity">

    <include layout="@layout/content_main" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/navigation_header"
        app:menu="@menu/navigation_menu" />

</androidx.drawerlayout.widget.DrawerLayout>

Answer 1

您应该在 xml 文件中创建 ImageButton 视图，然后将 onClickListener 绑定到它并在 onClick 触发时调用 startActivity。

举例说明：

public class TabFragment1 extends Fragment {

ImageButton imageButton;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view =  inflater.inflate(R.layout.fragment_tab_fragment1, container, false);
    imageButton = (ImageButton)view.findViewById(R.id.imageButton);
    imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            startActivity(getActivity(),NewActivity.class);
        }
    });
    return view;}

如何使用图像按钮从片段中打开 activity？

How to open an activity from a fragment using imagebutton?

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