java - 当新消息从 Firebase 实时数据库到达时如何发出通知声音

标签 java android firebase push-notification android-notifications

我在我的聊天应用程序中使用以下代码，它使用实时 Firebase 数据库在用户之间聊天。

我想在收到新消息时使用通知声音，并且在工具栏上有一个选项可以关闭或打开它。

这可能吗？

这是聊天室的代码

package com.nepalpolice.mnemonics.chat;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.nepalpolice.mnemonics.R;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Created by filipp on 6/28/2016.
 */
public class Chat_Room  extends AppCompatActivity{

    private Button btn_send_msg;
    private EditText input_msg;
    private TextView chat_conversation;

    private Toolbar mainToolbar;
    private String user_name,room_name;
    private DatabaseReference root ;
    private String temp_key;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chat_room);

        btn_send_msg = (Button) findViewById(R.id.btn_send);
        input_msg = (EditText) findViewById(R.id.msg_input);
        chat_conversation = (TextView) findViewById(R.id.textView);
        user_name = getIntent().getExtras().get("user_name").toString();
        room_name = getIntent().getExtras().get("room_name").toString();

        mainToolbar = (Toolbar) findViewById(R.id.main_chat);
        setSupportActionBar(mainToolbar);
        getSupportActionBar().setTitle(" Room - "+room_name);


        root = FirebaseDatabase.getInstance().getReference().child(room_name);

        btn_send_msg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Map<String,Object> map = new HashMap<String, Object>();
                temp_key = root.push().getKey();
                root.updateChildren(map);
                DatabaseReference message_root = root.child(temp_key);
                Map<String,Object> map2 = new HashMap<String, Object>();
                map2.put("name",user_name);
                map2.put("msg",input_msg.getText().toString());
                message_root.updateChildren(map2);
                input_msg.getText().clear();

            }
        });

        root.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {

                append_chat_conversation(dataSnapshot);
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

                append_chat_conversation(dataSnapshot);

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

    }

    private String chat_msg,chat_user_name;

    private void append_chat_conversation(DataSnapshot dataSnapshot) {

        Iterator i = dataSnapshot.getChildren().iterator();

        while (i.hasNext()){

               chat_msg = (String) ((DataSnapshot)i.next()).getValue();
            chat_user_name = (String) ((DataSnapshot)i.next()).getValue();

            chat_conversation.append(chat_user_name +" : "+chat_msg +" \n");
        }



    }
    public static boolean isNetworkStatusAvialable (Context context) {
        ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null &&
                activeNetwork.isConnectedOrConnecting();

    }

}

我的 Firebase 数据结构是

Firebase Data Structure Image enter image description here

提前致谢。

我的主 Activity 文件是

package com.nepalpolice.mnemonics.chat;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.nepalpolice.mnemonics.R;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import static java.security.AccessController.getContext;

public class MainActivity extends AppCompatActivity {
    ProgressBar progressBar;
    private Toolbar mainToolbar;
    private Button  add_room;
    private EditText room_name;
    public static final String MyPREFERENCES = "MyPrefs" ;
    public static final String username = "userKey";
    SharedPreferences sharedpreferences;
    private ListView listView;
    private ArrayAdapter<String> arrayAdapter;
    private ArrayList<String> list_of_rooms = new ArrayList<>();
    private String name;
    private DatabaseReference root = FirebaseDatabase.getInstance().getReference().getRoot();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);


        mainToolbar = (Toolbar) findViewById(R.id.main_chatbar);
        setSupportActionBar(mainToolbar);
        getSupportActionBar().setTitle("Chat Rooms");

        progressBar= (ProgressBar) findViewById(R.id.webViewProgressfaq);
        add_room = (Button) findViewById(R.id.btn_add_room);
        room_name = (EditText) findViewById(R.id.room_name_edittext);
        listView = (ListView) findViewById(R.id.listView);
        sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);

        arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list_of_rooms);

        listView.setAdapter(arrayAdapter);



        add_room.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Map<String,Object> map = new HashMap<String, Object>();
                map.put(room_name.getText().toString(),"");
                root.updateChildren(map);

            }
        });


        if(isNetworkStatusAvialable (getApplicationContext())) {
            request_user_name();
            root.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {

                    Set<String> set = new HashSet<String>();
                    Iterator i = dataSnapshot.getChildren().iterator();

                    while (i.hasNext()) {
                        set.add(((DataSnapshot) i.next()).getKey());
                    }

                    list_of_rooms.clear();
                    list_of_rooms.addAll(set);

                    arrayAdapter.notifyDataSetChanged();

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

        }else{
            Toast.makeText(getBaseContext(), "You're Offline!", Toast.LENGTH_SHORT).show();
            progressBar.setVisibility(View.VISIBLE);
        }


        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                Intent intent = new Intent(getApplicationContext(),Chat_Room.class);
                intent.putExtra("room_name",((TextView)view).getText().toString() );
                intent.putExtra("user_name",name);
                startActivity(intent);
            }
        });

    }



    private void request_user_name() {
     final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Enter name:");

        final EditText input_field = new EditText(this);
        input_field.setText(sharedpreferences.getString("username",""));
        final SharedPreferences.Editor editor = sharedpreferences.edit();

        builder.setCancelable(false);
        builder.setView(input_field);
        final String savedName = sharedpreferences.getString(username,"");
        input_field.setText(savedName);
        input_field.setSelection(input_field.getText().length());
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                name = input_field.getText().toString();

                if(TextUtils.isEmpty(savedName)) {
                    input_field.setError("Your message");
                    builder.setCancelable(false);
                }
                editor.putString(username, name);
                editor.apply();
            }
        });

        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                if(TextUtils.isEmpty(savedName)) {
                    input_field.setError("Your message");
                    builder.setCancelable(false);
                }
                else
                {
                    dialogInterface.cancel();
                    request_user_name();
                }

            }
        });
        builder.show();
    }

    public static boolean isNetworkStatusAvialable (Context context) {
        ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null &&
                activeNetwork.isConnectedOrConnecting();

    }
}

最佳答案 

    NotificationCompat.Builder builder =  new NotificationCompat.Builder(this)  
    .setSmallIcon(R.drawable.ic_launcher)  
    .setContentTitle("Notifications Example")  
    .setContentText("This is a test notification");  


  Intent notificationIntent = new Intent(this, MenuScreen.class);  

  PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,   
    PendingIntent.FLAG_UPDATE_CURRENT);  

 builder.setContentIntent(contentIntent);  
 builder.setAutoCancel(true);
 builder.setLights(Color.BLUE, 500, 500);
 long[] pattern = {500,500,500,500,500,500,500,500,500};
 builder.setVibrate(pattern);
 builder.setStyle(new NotificationCompat.InboxStyle());
 builder.setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
 NotificationManager manager = (NotificationManager) 
 getSystemService(Context.NOTIFICATION_SERVICE);  
 manager.notify(1, builder.build());

关于java - 当新消息从 Firebase 实时数据库到达时如何发出通知声音，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49809499/

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