我的问题是关于我的消息发送应用程序。我试图按下按钮发送消息，但我被困在某事上。我查看了一个教程并按照它，并设法将代码更改为我自己的功能，但我无法弄清楚如何通过单击按钮发送消息（例如，当我按下红色按钮时，我必须按＆＃34;发送＆＃34;按钮才能实际发送信息。我想在按下红色按钮后发送信息。）
理想情况下，我想在我的程序中实现两者，但它花费的时间比我想象的要长，所以我只是坚持原来的目标。任何人都可以看到我应该在哪里更改我的代码吗？
package app.real_time_chat;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View.OnClickListener;
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 java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Created by David on 5/01/2017
*/
public class Chat_Room extends AppCompatActivity{
private Button btn_send_msg;
private Button button_msg;
private EditText input_msg;
private TextView chat_conversation;
private String user_name,room_name;
private DatabaseReference root ;
private String temp_key;
private String greeting;
//for displaying button messages
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_room);
button_msg = (Button)findViewById(R.id.button_red);
button_msg.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
greeting = "It's Red" ;
//for displaying red color
}});
button_msg = (Button)findViewById(R.id.button_blue);
button_msg.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
greeting = "It's Blue" ; //for displaying blue color
}});
button_msg = (Button)findViewById(R.id.button_green);
button_msg.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
greeting = "It's Green" ;
//for displaying green color
}});
button_msg = (Button)findViewById(R.id.button_yellow);
button_msg.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
greeting = "It's Yellow" ; //for displaying yellow color
}});
btn_send_msg = (Button) findViewById(R.id.btn_send);
// 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(); //converts username to string to display to screen
room_name = getIntent().getExtras().get("room_name").toString(); //converts room name to string to display to screen
setTitle(" Room - "+room_name); //displays pre-set room name to top of app page
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",greeting);
// map2.put("msg",input_msg.getText().toString());
message_root.updateChildren(map2);
}
});
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");
}
}
}
答案 0 :(得分：1)
你可以点击添加电话到
等方法button_msg.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
greeting = "It's Yellow" ; //for displaying yellow color
btn_send_msg.callOnClick();
}});
如果你想同时做两件事你应该做这样的事情并制作一个新的方法
添加
private void sendMessage(String message)
{
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",message);
// map2.put("msg",input_msg.getText().toString());
message_root.updateChildren(map2);
}
那么按钮应该是这样的 button_msg =（Button）findViewById（R.id.button_red）; button_msg.setOnClickListener（new OnClickListener（）{
@Override
public void onClick(View arg0) {
sendMessage("It's Red");
//for displaying red color
}});
并且发送输入的发送按钮将是
btn_send_msg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sendMessage(input_msg.getText().toString());
}
});