无法在ListView android中查看项目
我想在列表视图中动态显示项目。在我的例子中，项目来自服务。服务广播该项，活动接收该项并填充该项的数组，我使用该数组填充列表视图 你能帮我知道我做错了什么吗 这是我的密码：无法在ListView android中查看项目,android,android-layout,listview,broadcastreceiver,android-service,Android,Android Layout,Listview,Broadcastreceiver,Android Service,我想在列表视图中动态显示项目。在我的例子中，项目来自服务。服务广播该项，活动接收该项并填充该项的数组，我使用该数组填充列表视图 你能帮我知道我做错了什么吗 这是我的密码： public class MacaddressInfo extends AppCompatActivity { ArrayList<String> listofMac=new ArrayList<String>(); ArrayAdapter<String> adapter;
public class MacaddressInfo extends AppCompatActivity {
ArrayList<String> listofMac=new ArrayList<String>();
ArrayAdapter<String> adapter;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_macaddress_info);
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();
}
});
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("intMAC"));
}
@Override
protected void onResume() {
super.onResume();
}
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
handleMessage(intent);
}
};
private void handleMessage(Intent msg){
if(msg != null) {
Bundle data = msg.getExtras();
String res = data.getString("result");
Log.d("macaddinfo", "macaddress info is: " + res);
listofMac.add(res);
lv = (ListView)findViewById(R.id.lstMac);
adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,listofMac);
setListAdapter(adapter);
Log.i("handlemessage", "Array count is: " + listofMac.size() + " ListView count is: " + lv.getCount());
}
}
protected ListView getListView() {
if (lv == null) {
lv = (ListView) findViewById(R.id.lstMac);
}
return lv;
}
protected void setListAdapter(ListAdapter adapter) {
getListView().setAdapter(adapter);
}
}
public class MainActivity extends AppCompatActivity {
ArrayList<String> listItems=new ArrayList<String>();
ArrayAdapter<String> adapter;
int clickCounter=0;
ListView lv;
EditText txtIP;
Button btnAdd,btnUpdate,btnDel;
int itemPos;
APIService mservice;
boolean mBound = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
txtIP = (EditText)findViewById(R.id.txtIP);
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();
}
});
lv = (ListView)findViewById(R.id.lstItems);
adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,listItems);
setListAdapter(adapter);
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) {
txtIP.setText(listItems.get(position));
itemPos = position;
Log.d("onlongclickpos", "long click pos is: " + position);
return true;
}
});
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this,MacaddressInfo.class);
startActivity(intent);
mservice.AddMacAddress("TestMAC");
}
});
}
@Override
protected void onStart() {
super.onStart();
// Bind to LocalService
Intent intent = new Intent(this, APIService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
// Unbind from the service
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
APIService.LocalBinder binder = (APIService.LocalBinder) service;
mservice = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
public void addItems(View v) {
txtIP = (EditText)findViewById(R.id.txtIP);
String strItem = txtIP.getText().toString();
listItems.add(strItem);
adapter.notifyDataSetChanged();
}
public void updateItem(View v) {
//txtIP = (EditText)findViewById(R.id.txtIP);
String strItem = txtIP.getText().toString();
//Toast.makeText(this,"pos is " + lv.getCheckedItemPosition(),Toast.LENGTH_LONG).show();
int pos = itemPos;
if(pos > -1) {
adapter.remove(listItems.get(pos));
adapter.insert(strItem, pos);
}
adapter.notifyDataSetChanged();
}
public void delItem(View v) {
//int pos = lv.getCheckedItemPosition();
int pos = itemPos;
if(pos>-1)
{
adapter.remove(listItems.get(pos));
}
adapter.notifyDataSetChanged();
}
protected ListView getListView() {
if (lv == null) {
lv = (ListView) findViewById(R.id.lstItems);
}
return lv;
}
protected void setListAdapter(ListAdapter adapter) {
getListView().setAdapter(adapter);
}
protected ListAdapter getListAdapter() {
ListAdapter adapter = getListView().getAdapter();
if (adapter instanceof HeaderViewListAdapter) {
return ((HeaderViewListAdapter)adapter).getWrappedAdapter();
} else {
return adapter;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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);
}
}
public类MainActivity扩展了AppCompatActivity{
ArrayList listItems=新的ArrayList（）；
阵列适配器；
int clickCounter=0；
ListView lv；
编辑文本txtIP；
按钮btnAdd、btnUpdate、btnDel；
int itemPos；
APIService mservice；
布尔mBound=false；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
Toolbar Toolbar=（Toolbar）findViewById（R.id.Toolbar）；
设置支持操作栏（工具栏）；
txtIP=（EditText）findViewById（R.id.txtIP）；
FloatingActionButton fab=（FloatingActionButton）findViewById（R.id.fab）；
fab.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
Snackbar.make（查看“替换为您自己的操作”，Snackbar.LENGTH\u LONG）
.setAction（“Action”，null）.show（）；
}
});
lv=（ListView）findViewById（R.id.lstItems）；
adapter=newarrayadapter（这是android.R.layout.simple\u list\u item\u 1，listItems）；
setListAdapter（适配器）；
lv.setOnItemLongClickListener（新的AdapterView.OnItemLongClickListener（）{
@凌驾
公共布尔值长单击（AdapterView父对象、视图v、整型位置、长id）{
setText（listItems.get（position））；
itemPos=位置；
Log.d（“onlongclickpos”，“longClickPOS为：+位置”）；
返回true；
}
});
lv.setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
Intent Intent=新Intent（MainActivity.this，MacaddressInfo.class）；
星触觉（意向）；
mservice.AddMacAddress（“TestMAC”）；
}
});
}
@凌驾
受保护的void onStart（）{
super.onStart（）；
//绑定到本地服务
Intent Intent=新Intent（这个，APIService.class）；
bindService（intent、mConnection、Context.BIND\u AUTO\u CREATE）；
}
@凌驾
受保护的void onStop（）{
super.onStop（）；
//解除服务绑定
如果（mBound）{
解除绑定服务（mConnection）；
mBound=假；
}
}
专用ServiceConnection mConnection=新ServiceConnection（）{
@凌驾
ServiceConnected上的公共无效（ComponentName类名称，
IBinder服务）{
//我们已经绑定到LocalService，强制转换IBinder并获取LocalService实例
APIService.LocalBinder=（APIService.LocalBinder）服务；
mservice=binder.getService（）；
mBound=true；
}
@凌驾
ServiceDisconnected上的公共无效（组件名称arg0）{
mBound=假；
}
};
公共无效附加项（视图五）{
txtIP=（EditText）findViewById（R.id.txtIP）；
String strItem=txtIP.getText（）.toString（）；
添加（strItem）；
adapter.notifyDataSetChanged（）；
}
公共无效更新项（视图v）{
//txtIP=（EditText）findViewById（R.id.txtIP）；
String strItem=txtIP.getText（）.toString（）；
//Toast.makeText（这个“pos是”+lv.getCheckedItemPosition（），Toast.LENGTH\u LONG.show（）；
int pos=itemPos；
如果（位置>-1）{
移除（listItems.get（pos））；
适配器。插入件（条纹，位置）；
}
adapter.notifyDataSetChanged（）；
}
公共作废文件（视图五）{
//int pos=lv.getCheckedItemPosition（）；
int pos=itemPos；
如果（位置>-1）
{
移除（listItems.get（pos））；
}
adapter.notifyDataSetChanged（）；
}
受保护的ListView getListView（）{
if（lv==null）{
lv=（ListView）findViewById（R.id.lstItems）；
}
返回lv；
}
受保护的无效setListAdapter（ListAdapter适配器）{
getListView（）.setAdapter（适配器）；
}
受保护的ListAdapter getListAdapter（）{
ListAdapter=getListView（）.getAdapter（）；
if（HeadServiceWListAdapter的适配器实例）{
return（（HeaderViewListAdapter）适配器）.getWrappedAdapter（）；
}否则{
返回适配器；
}
}
@凌驾
公共布尔onCreateOptions菜单（菜单）{
//为菜单充气；这会将项目添加到操作栏（如果存在）。
getMenuInflater（）.充气（右菜单菜单菜单主菜单）；
返回true；
}
@凌驾
公共布尔值onOptionsItemSelected（菜单项项）{
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击，只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId（）；
//noinspection SimplifiableIf语句
if（id==R.id.action\u设置）{
返回true；
}
返回super.onOptionsItemSelected（项目）；
}
}
onCreatehandleMessage适配器。notifyDataSetChanged（）listOfMacpublic class APIService extends Service {
private final IBinder mBinder = new LocalBinder();
public class LocalBinder extends Binder {
APIService getService() {
// Return this instance of LocalService so clients can call public methods
return APIService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
public void AddMacAddress(String str)
{
Log.d("APIService","message is: " + str);
Intent intent = new Intent("intMAC");
intent.putExtra("result",str);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
Log.d("APIService", "intent broadcasted");
}
}
public class MainActivity extends AppCompatActivity {
ArrayList<String> listItems=new ArrayList<String>();
ArrayAdapter<String> adapter;
int clickCounter=0;
ListView lv;
EditText txtIP;
Button btnAdd,btnUpdate,btnDel;
int itemPos;
APIService mservice;
boolean mBound = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
txtIP = (EditText)findViewById(R.id.txtIP);
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();
}
});
lv = (ListView)findViewById(R.id.lstItems);
adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,listItems);
setListAdapter(adapter);
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) {
txtIP.setText(listItems.get(position));
itemPos = position;
Log.d("onlongclickpos", "long click pos is: " + position);
return true;
}
});
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this,MacaddressInfo.class);
startActivity(intent);
mservice.AddMacAddress("TestMAC");
}
});
}
@Override
protected void onStart() {
super.onStart();
// Bind to LocalService
Intent intent = new Intent(this, APIService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
// Unbind from the service
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
APIService.LocalBinder binder = (APIService.LocalBinder) service;
mservice = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
public void addItems(View v) {
txtIP = (EditText)findViewById(R.id.txtIP);
String strItem = txtIP.getText().toString();
listItems.add(strItem);
adapter.notifyDataSetChanged();
}
public void updateItem(View v) {
//txtIP = (EditText)findViewById(R.id.txtIP);
String strItem = txtIP.getText().toString();
//Toast.makeText(this,"pos is " + lv.getCheckedItemPosition(),Toast.LENGTH_LONG).show();
int pos = itemPos;
if(pos > -1) {
adapter.remove(listItems.get(pos));
adapter.insert(strItem, pos);
}
adapter.notifyDataSetChanged();
}
public void delItem(View v) {
//int pos = lv.getCheckedItemPosition();
int pos = itemPos;
if(pos>-1)
{
adapter.remove(listItems.get(pos));
}
adapter.notifyDataSetChanged();
}
protected ListView getListView() {
if (lv == null) {
lv = (ListView) findViewById(R.id.lstItems);
}
return lv;
}
protected void setListAdapter(ListAdapter adapter) {
getListView().setAdapter(adapter);
}
protected ListAdapter getListAdapter() {
ListAdapter adapter = getListView().getAdapter();
if (adapter instanceof HeaderViewListAdapter) {
return ((HeaderViewListAdapter)adapter).getWrappedAdapter();
} else {
return adapter;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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);
}
}
public class MacAddressActivity extends AppCompatActivity {
// Static variables shared at class-level
private static final ArrayList<String> listofMac = new ArrayList<String>();
private static boolean mRegistered;
private ArrayAdapter<String> adapter;
private ListView lv;
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
handleMessage(intent);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_macaddress_info);
lv = (ListView) findViewById(R.id.lstMac);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listofMac);
lv.setAdapter(adapter);
// fab code
}
@Override
protected void onStart() {
super.onStart();
// prevent from registering again
if (!mRegistered) {
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("intMAC"));
mRegistered = true;
}
}
@Override
protected void onPause() {
super.onPause();
// Should be unregistered, but uncommenting this makes it stop working
/*
if (mRegistered) {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
mRegistered = false;
}
*/
}
private void handleMessage(Intent msg) {
if (msg != null) {
Bundle data = msg.getExtras();
String res = data.getString("result");
Log.d("macaddinfo", "macaddress info is: " + res);
listofMac.add(res);
adapter.notifyDataSetChanged();
Log.i("handlemessage", "Array count is: " + listofMac.size() + " ListView count is: " + lv.getCount());
}
}
}