public class Constant {
public static final String FIREBASE_CHAT_URL="https://roadcaremap.firebaseio.com/";
public static final String CHILD_USERS="users";
public static final String CHILD_CHAT="chat";
public static final String KEY_SEND_USER="key_send_user";
public static final String CHILD_CONNECTION="connecttion";
public static final String CHILD_LATITUDE="latitude";
public static final String CHILD_LONGITUDE="longitude";
public static final String KEY_EMAIL="email";
public static final String KEY_ONLINE="online";
public static final String KEY_OFFLINE="offline";
public static final String KEY_CLOSE="key_close";
}
我是Android新手。最近，我在设备上运行应用程序时遇到问题。应用程式当机，并在这行中显示错误讯息，我不知道该如何解决。我添加了logcat的代码和图片。任何帮助将非常感激。错误显示在此行中。
rootUrl =新的Firebase（Constant.FIREBASE_CHAT_URL）;
package com.snapsofts.demogmap.activity;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import com.firebase.client.AuthData;
import com.firebase.client.ChildEventListener;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import com.firebase.ui.auth.AuthUI;
import com.google.firebase.auth.FirebaseAuth;
import com.google.gson.Gson;
import com.snapsofts.demogmap.R;
import com.snapsofts.demogmap.Services.LocationService;
import com.snapsofts.demogmap.common.Constant;
import com.snapsofts.demogmap.object.User;
import java.util.ArrayList;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
public class MainActivity extends AppCompatActivity {
private Firebase rootUrl;
private Firebase urlCurrenUser;
private Firebase urlAllUser;
private FirebaseAuth mAuth;
private Firebase.AuthStateListener mAuthStateListener;
private String currenUserId;
private String currenUserEmail;
private ArrayList<User> arrUser;
private AllUserAdapter allUserAdapter;
private ArrayList<String> arrStringEmail;
private ValueEventListener valueEventListenerUserConnected;
private User currenUser;
@BindView(R.id.btnLogout)
Button btnLogout;
@BindView(R.id.lvUser)
ListView lvUser;
@BindView(R.id.tvUsserName)
TextView tvUsserName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
MainActivity.this.startService(new Intent(MainActivity.this, LocationService.class));
arrStringEmail = new ArrayList<>();
arrUser = new ArrayList<User>();
allUserAdapter = new AllUserAdapter(MainActivity.this, 0, arrUser);
lvUser.setAdapter(allUserAdapter);
lvUser.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent=new Intent(MainActivity.this,MapsActivity.class);
User user=arrUser.get(position);
Gson gson=new Gson();
intent.putExtra(Constant.KEY_SEND_USER,gson.toJson(user).toString()+"---"+gson.toJson(currenUser).toString());
startActivity(intent);
mAuth = FirebaseAuth.getInstance();
}
});
rootUrl = new Firebase(Constant.FIREBASE_CHAT_URL);
mAuthStateListener = new Firebase.AuthStateListener() {
@Override
public void onAuthStateChanged(AuthData authData) {
setAuthenticatedUser();
}
};
rootUrl.addAuthStateListener(mAuthStateListener);
}
private void setAuthenticatedUser () {
if (FirebaseAuth.getInstance().getCurrentUser() != null) {
currenUserId = FirebaseAuth.getInstance().getCurrentUser().getUid();
currenUserEmail = FirebaseAuth.getInstance().getCurrentUser().getEmail();
getCurrenUser();
getAllUser();
} else {
startActivity(new Intent(MainActivity.this, LoginActivity.class));
finish();
}
}
public void getCurrenUser() {
urlCurrenUser = new Firebase(Constant.FIREBASE_CHAT_URL).child(Constant.CHILD_USERS).child(FirebaseAuth.getInstance().getCurrentUser().getUid());
urlCurrenUser.addValueEventListener(valueEventListenerCurrenUser);
valueEventListenerUserConnected=rootUrl.getRoot().child(".info/connected").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
boolean connected = (Boolean) dataSnapshot.getValue();
if (connected) {
urlCurrenUser.child(Constant.CHILD_CONNECTION).setValue(Constant.KEY_ONLINE);
urlCurrenUser.child(Constant.CHILD_CONNECTION).onDisconnect().setValue(Constant.KEY_OFFLINE);
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
}
private ValueEventListener valueEventListenerCurrenUser = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
User user = dataSnapshot.getValue(User.class);
tvUsserName.setText("Hello "+user.name);
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
};
public void getAllUser() {
urlAllUser = new Firebase(Constant.FIREBASE_CHAT_URL).child(Constant.CHILD_USERS);
urlAllUser.addChildEventListener(childEventListenerAllUser);
}
private ChildEventListener childEventListenerAllUser = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
User user = dataSnapshot.getValue(User.class);
if (!dataSnapshot.getKey().equals(currenUserId)){
arrStringEmail.add(user.email);
arrUser.add(user);
allUserAdapter.notifyDataSetChanged();
}else {
currenUser=user;
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
if (!dataSnapshot.getKey().equals(currenUserId)){
User user = dataSnapshot.getValue(User.class);
int index = arrStringEmail.indexOf(user.email);
arrUser.set(index, user);
allUserAdapter.notifyDataSetChanged();
}
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
};
@Override
protected void onDestroy() {
super.onDestroy();
try {
rootUrl.removeAuthStateListener(mAuthStateListener);
} catch (Exception e) {
}
try {
urlCurrenUser.removeEventListener(valueEventListenerCurrenUser);
} catch (Exception e) {
}
try {
urlAllUser.removeEventListener(childEventListenerAllUser);
} catch (Exception e) {
}
try {
rootUrl.getRoot().child(".info/connected").removeEventListener(valueEventListenerUserConnected);
}catch (Exception e){}
}
@OnClick(R.id.btnLogout)
public void btnLogout() {
if (FirebaseAuth.getInstance().getCurrentUser() != null) {
stopService(new Intent(this, LocationService.class));
AuthUI.getInstance().signOut(this);
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(intent);
finish();
}
}
public class AllUserAdapter extends ArrayAdapter<User> {
private Activity mActivity;
private ArrayList<User> mArrUser;
@BindView(R.id.tvNameUser)
TextView tvNameUser;
@BindView(R.id.tvStatus)
TextView tvStatus;
public AllUserAdapter(Activity mActivity, int resource, ArrayList<User> mArrUser) {
super(mActivity, resource, mArrUser);
this.mActivity = mActivity;
this.mArrUser = mArrUser;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater layoutInflater = mActivity.getLayoutInflater();
convertView = layoutInflater.inflate(R.layout.item_list_user, null);
}
ButterKnife.bind(this, convertView);
tvNameUser.setText(mArrUser.get(position).name);
tvStatus.setText(mArrUser.get(position).connecttion);
if (mArrUser.get(position).connecttion.equals(Constant.KEY_ONLINE)){
tvStatus.setTextColor(Color.parseColor("#00FF00"));
}else {
tvStatus.setTextColor(Color.parseColor("#FF0000"));
}
return convertView;
}
}
}
