我正在使用java和kotlin构建一个Android应用程序。我对kotlin很新，我的适配器出现问题。由于某种原因，似乎适配器ViewHolder没有正确绑定。我不知道该怎么办，因为我没有收到任何错误消息，我在调试时遇到了麻烦。这是我的适配器的代码：
data class NetworkTest(val addr: String, val port: String, val results: String, val protocol: String)
public class NetTestRecyclerAdapter(val netList: List<NetworkTest>, val context: Context): RecyclerView.Adapter<NetTestRecyclerAdapter.NetTestRecyclerHolder>(){
override fun onBindViewHolder(holder: NetTestRecyclerHolder, position: Int) {
holder.bindItems(netList[position])
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NetTestRecyclerHolder {
val v: View = LayoutInflater.from(context).inflate(R.layout.tested_list_item, parent, false)
return NetTestRecyclerHolder(v)
}
override fun getItemCount(): Int {
return netList.size
}
class NetTestRecyclerHolder(itemView: View): RecyclerView.ViewHolder(itemView){
fun bindItems(networkTest: NetworkTest){
val addrPortView = itemView.find<TextView>(R.id.addrPortView)
val resultsProtocolView = itemView.find<TextView>(R.id.resultProtocolView)
addrPortView.text = "Address: ${networkTest.addr} Port: ${networkTest.port}"
resultsProtocolView.text = "Results: ${networkTest.results} Protocol: ${networkTest.protocol}"
}
}
}
这是我主要活动的代码：
public class NetTestActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_net_test);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
mRecyclerView = (RecyclerView)findViewById(R.id.networkList);
List toolTestList = new ArrayList<>();
toolTestList.add(new NetworkTest("addr", "port", "results", "protocol"));
NetTestRecyclerAdapter adapter = new NetTestRecyclerAdapter(toolTestList, getApplicationContext()); //context may need to be changed
mRecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mRecyclerView.setAdapter(adapter);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.net_test, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
请帮助我找到我在这里做错了什么。提前感谢您的帮助。
继承我的浏览器的布局文件以及
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_item"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/addrPortView"
android:text="testing"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/resultProtocolView"
android:text="again"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
我的recyclerview布局如下所示：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/networkList"
android:layout_height="match_parent"
android:layout_width="match_parent">
</android.support.v7.widget.RecyclerView>
我应该包括这样的内容：
<include
layout="@layout/activity_net_test"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
这里是adb dumpsys top
adb shell dumpsys activity top
TASK com.example.zacharymcdaniel.nettest id=4928
ACTIVITY com.example.zacharymcdaniel.nettest/.NetTestActivity 2543227 pid=14548
Local Activity 5de3ad9 State:
mResumed=true mStopped=false mFinished=false
mChangingConfigurations=false
mCurrentConfig={1.0 311mcc870mnc en_US ldltr sw360dp w360dp h569dp 320dpi nrml port finger -keyb/v/h -nav/h s.73 fontTypeIndex0 forceEmbolden0}
mLoadersStarted=true
FragmentManager misc state:
mHost=android.app.Activity$HostCallbacks@86516d4
mContainer=android.app.Activity$HostCallbacks@86516d4
mCurState=5 mStateSaved=false mDestroyed=false
ViewRoot:
mAdded=true mRemoved=false
mConsumeBatchedInputScheduled=false
mConsumeBatchedInputImmediatelyScheduled=false
mPendingInputEventCount=0
mProcessInputEventsScheduled=false
mTraversalScheduled=false
android.view.ViewRootImpl$NativePreImeInputStage: mQueueLength=0
android.view.ViewRootImpl$ImeInputStage: mQueueLength=0
android.view.ViewRootImpl$NativePostImeInputStage: mQueueLength=0
Choreographer:
mFrameScheduled=false
mLastFrameTime=43338300 (43548 ms ago)
View Hierarchy:
com.android.internal.policy.PhoneWindow$DecorView{bf7807d V.E...... R....... 0,0-720,1280}
android.widget.LinearLayout{f35fb72 V.E...... ........ 0,0-720,1187}
android.view.ViewStub{8c4fbc3 G.E...... ......I. 0,0-0,0 #10203aa android:id/action_mode_bar_stub}
android.widget.FrameLayout{c66cc40 V.E...... ........ 0,0-720,1187}
android.support.v7.widget.FitWindowsLinearLayout{380a779 V.E...... ........ 0,0-720,1187 #7f0d0067 app:id/action_bar_root}
android.support.v7.widget.ViewStubCompat{1645cbe G.E...... ......I. 0,0-0,0 #7f0d0068 app:id/action_mode_bar_stub}
android.support.v7.widget.ContentFrameLayout{4f1911f V.E...... ........ 0,0-720,1187 #1020002 android:id/content}
android.support.v4.widget.DrawerLayout{20c6c6c VFED..... ........ 0,0-720,1187 #7f0d007b app:id/drawer_layout}
android.support.design.widget.CoordinatorLayout{fdb4235 V.E...... ........ 0,48-720,1187}
android.support.design.widget.AppBarLayout{90688e5 V.E...... ........ 0,0-720,112}
android.support.v7.widget.Toolbar{88586ca V.E...... ........ 0,0-720,112 #7f0d007d app:id/toolbar}
android.support.v7.widget.AppCompatTextView{a28203b V.ED..... ........ 144,29-283,83}
android.support.v7.widget.AppCompatImageButton{589e358 VFED..C.. ........ 0,0-112,112}
android.support.v7.widget.ActionMenuView{d0accb1 V.E...... ........ 640,0-720,112}
android.support.v7.widget.ActionMenuPresenter$OverflowMenuButton{9dd4596 VFED..CL. ........ 0,8-80,104}
android.support.v7.widget.RecyclerView{b9c3fba VFED..... .F...... 0,0-720,1139 #7f0d007f app:id/networkList}
android.widget.LinearLayout{66e8517 V.E...... ........ 0,0-720,76 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{5cc1647 V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{65dd04 V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.widget.LinearLayout{9ce82ed V.E...... ........ 0,76-720,152 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{e5ef9d V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{9202522 V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.widget.LinearLayout{84c5bb3 V.E...... ........ 0,152-720,228 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{fa9cfe3 V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{be5c570 V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.widget.LinearLayout{79d60e9 V.E...... ........ 0,228-720,304 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{b36e899 V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{ebf716e V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.widget.LinearLayout{527000f V.E...... ........ 0,304-720,380 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{81f873f V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{e39c89c V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.widget.LinearLayout{e6222a5 V.E...... ........ 0,380-720,456 #7f0d0050 app:id/list_item}
android.support.v7.widget.AppCompatTextView{4047555 V.ED..... ........ 0,0-720,38 #7f0d00a5 app:id/addrPortView}
android.support.v7.widget.AppCompatTextView{6f5367a V.ED..... ........ 0,38-720,76 #7f0d00a6 app:id/resultProtocolView}
android.support.design.widget.FloatingActionButton{cdfe6b VFED..C.. ........ 576,995-688,1107 #7f0d007e app:id/fab}
android.support.design.widget.NavigationView{95d8e2b I.ED..... ......ID -560,0-0,1187 #7f0d007c app:id/nav_view}
android.support.design.internal.NavigationMenuView{e68d288 VFED.V... ......ID 0,0-560,1187 #7f0d0087 app:id/design_navigation_view}
android.widget.LinearLayout{ff74421 V.E...... ......I. 0,0-560,336 #7f0d0086 app:id/navigation_header_container}
android.widget.LinearLayout{5904046 V.E...... ......ID 0,0-560,320}
android.support.v7.widget.AppCompatImageView{e24e207 V.ED..... ......ID 32,52-128,180 #7f0d008c app:id/imageView}
android.support.v7.widget.AppCompatTextView{afc8f34 V.ED..... ......ID 32,180-528,250}
android.support.v7.widget.AppCompatTextView{763015d V.ED..... ......ID 32,250-294,288 #7f0d008d app:id/textView}
android.support.design.internal.NavigationMenuItemView{a801ad2 VFED..C.. ......I. 0,336-560,432}
android.support.v7.widget.AppCompatCheckedTextView{12397a3 V.ED..... ......ID 32,0-528,96 #7f0d0088 app:id/design_menu_item_text}
android.view.ViewStub{f6d6aa0 G.E...... ......I. 0,0-0,0 #7f0d0089 app:id/design_menu_item_action_area_stub}
android.support.design.internal.NavigationMenuItemView{fd35659 VFED..C.. ......I. 0,432-560,528}
android.support.v7.widget.AppCompatCheckedTextView{321121e V.ED..... ......ID 32,0-528,96 #7f0d0088 app:id/design_menu_item_text}
android.view.ViewStub{9ce0aff G.E...... ......I. 0,0-0,0 #7f0d0089 app:id/design_menu_item_action_area_stub}
android.support.design.internal.NavigationMenuItemView{44e90cc VFED..C.. ......I. 0,528-560,624}
android.support.v7.widget.AppCompatCheckedTextView{f59ff15 V.ED..... ......ID 32,0-528,96 #7f0d0088 app:id/design_menu_item_text}
android.view.ViewStub{448322a G.E...... ......I. 0,0-0,0 #7f0d0089 app:id/design_menu_item_action_area_stub}
android.support.design.internal.NavigationMenuItemView{882581b VFED..C.. ......I. 0,624-560,720}
android.support.v7.widget.AppCompatCheckedTextView{639edb8 V.ED..... ......ID 32,0-528,96 #7f0d0088 app:id/design_menu_item_text}
android.view.ViewStub{1687791 G.E...... ......I. 0,0-0,0 #7f0d0089 app:id/design_menu_item_action_area_stub}
android.support.design.internal.NavigationMenuItemView{90f46f6 VFED..C.. ......I. 0,720-560,816}
android.support.v7.widget.AppCompatCheckedTextView{b645af7 V.ED..... ......ID 32,0-528,96 #7f0d0088 app:id/design_menu_item_text}
android.view.ViewStub{f7c2d64 G.E...... ......I. 0,0-0,0 #7f0d0089 app:id/design_menu_item_action_area_stub}
android.view.View{d0bfbcd V.ED..... ........ 0,1187-720,1280 #1020030 android:id/navigationBarBackground}
android.view.View{260dc82 V.ED..... ........ 0,0-720,48 #102002f android:id/statusBarBackground}
Looper (main, tid 1) {4f9af93}
(Total messages: 0, polling=false, quitting=false)
Local FragmentActivity 5de3ad9 State:
mCreated=truemResumed=true mStopped=false mReallyStopped=false
mLoadersStarted=true
FragmentManager misc state:
mHost=android.support.v4.app.FragmentActivity$HostCallbacks@80bbd0
mContainer=android.support.v4.app.FragmentActivity$HostCallbacks@80bbd0
mCurState=5 mStateSaved=false mDestroyed=false
答案 0 :(得分：0)
看起来你的适配器几乎没问题，但是你可以写你的视图持有人，这可能会有所帮助
class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
val addrPortView = view.findViewById(R.id.addrPortView) as TextView
fun bind(networkTest: NetworkTest){
addrPortView .text = "Address: ${networkTest.addr} Port:
${networkTest.port}"
}
}