Java 如何在单击列表项时打开仅显示消息内容的新活动

}

---

我想在单击列表视图中的消息时，打开仅包含按摩内容的新活动。我不想为每条消息创建活动，我想为每条消息使用相同的活动。如果有人可以帮助我……

，这取决于列表视图项的内容。如果只是免费的文本消息，那么只需在ListView中设置onItemClickListener以启动新活动，并在启动活动时将文本传递给intent。在新活动中，获取启动它的意图，从意图中获取消息，在活动中显示消息。您的新活动布局可能只是一个捕获整个活动的文本视图

这样，它就是一个活动，一旦您返回列表，该活动将被销毁，您将使用另一个项目再次启动它。关键是从ListView传递数据并将其传递到活动中

//Edit here是一个简单的示例，显示了如何在intent中传递数据：

package com.company.messagesystem;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class AllMessages extends Activity {
private List<Message> _messages = new ArrayList<Message>();

protected void onCreate(Bundle savedInstanceState) {    
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    populateMessageList();
    _messages = MessagesDataSource.getAll();
    populateListView();
    //registerClickCallBack();

    Button newMessageBtn = (Button) findViewById(R.id.new_message_btn);
    newMessageBtn.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v) {
            startActivity(new Intent("com.company.messagesystem.NEWMESSAGE"));              
        }           
    });
}

private void populateMessageList() {
    Calendar cal = Calendar.getInstance(); 
    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY, -1); 
    Date date1 = cal.getTime();
    SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");          
    String date= null;
    date = format1.format(date1);

    cal.setTime(new Date());  
    Date currDate2 = cal.getTime();         
    String date2= null;
    date2 = format1.format(currDate2);

    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY, -2); 
    Date currDate3 = cal.getTime();         
    String date3= null;
    date3 = format1.format(currDate3);

    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY, -3); 
    Date currDate4 = cal.getTime();         
    String date4= null;
    date4 = format1.format(currDate4);

    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY, -2); 
    Date currDate5 = cal.getTime();        
    String date5= null;
    date5 = format1.format(currDate5);

    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY,- 4); 
    Date currDate6 = cal.getTime();         
    String date6= null;
    date6 = format1.format(currDate6);

    cal.setTime(new Date()); 
    cal.add(Calendar.HOUR_OF_DAY,- 4); 
    Date currDate7 = cal.getTime();         
    String date7= null;
    date7 = format1.format(currDate7);

    MessagesDataSource.add(new Message(1, "Speed to hight", "You must to slow down! ", date,"Georgi Ivanov", R.drawable.ic_launcher, true, true));
    MessagesDataSource.add(new Message(1, "Speed to low", "You must to speed up!",date2,"Maria Petrova", R.drawable.ic_launcher,false, true));
    MessagesDataSource.add(new Message(1, "Delay", "You are gonna be late", date3,"Georgi Ivanov",R.drawable.ic_launcher, true, true));
    MessagesDataSource.add(new Message(1, "Traffic", "There is congestion after 30km", date4, "Maria Petrova",R.drawable.ic_launcher, true, true)); 
    MessagesDataSource.add(new Message(1, "Delay", "You are gonna be late", date5,"Georgi Ivanov",R.drawable.ic_launcher, true, true));
    MessagesDataSource.add(new Message(1, "Traffic", "There is congestion after 30km", date6, "Maria Petrova",R.drawable.ic_launcher, true, true));
    MessagesDataSource.add(new Message(1, "Speed to hight", "You must to slow down! ", date,"Georgi Ivanov", R.drawable.ic_launcher, true, true));
    MessagesDataSource.add(new Message(1, "Speed to low", "You must to speed up!",date7,"Maria Petrova", R.drawable.ic_launcher,false, true));
}

private void populateListView() {
    ArrayAdapter<Message> adapter = new MyListAdapter();
    ListView list = (ListView)findViewById(R.id.messageslistView);
    list.setAdapter(adapter);
}

private void registerClickCallBack() {
    ListView list = (ListView)findViewById(R.id.messageslistView);
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        }
    });     


private class MyListAdapter extends ArrayAdapter<Message>{
    public MyListAdapter(){
        super(AllMessages.this,R.layout.item_view,_messages);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View itemView = convertView;
        if(itemView == null){
            itemView = getLayoutInflater().inflate(R.layout.item_view, parent, false);
        }

        //Find the message to work with
        Message currentMessage = _messages.get(position);

        //Fill the view         
        ImageView imageView = (ImageView)itemView.findViewById(R.id.item_icon);
        imageView.setImageResource(currentMessage.getIconId());

        //Content
        TextView contentText = (TextView) itemView.findViewById(R.id.item_textContent);
        contentText.setText(currentMessage.getContent());

        //Subject
        TextView subjectText = (TextView) itemView.findViewById(R.id.item_textSubject);
        subjectText.setText(currentMessage.getSubject());

        //Date
        TextView dateText = (TextView) itemView.findViewById(R.id.item_textDate);
        dateText.setText(currentMessage.getDate().toString());

        return itemView;
    }   
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
}

This is the class Message:

public class Message {
public int Id;
private String subject;
private String content;
private String date;
private String sender;
private int iconId;
private boolean isRead;
private boolean isRecieved;

public Message(int id,String subject,String content,String date,String sender, int iconId, boolean isRead,boolean isRecieved){
    super();
    this.Id = id;
    this.subject = subject;
    this.content = content;
    this.date = date;
    this.sender = sender;
    this.iconId = iconId;
    this.isRead = isRead;
    this.isRead = isRead;
}

public int getId() {
    return Id;
}

public void setId(int id) {
    this.Id = id;
}

public String getSubject() {
    return subject;
}

public void setSubject(String subject) {
    this.subject = subject;
}

public String getContent() {
    return content;
}

public void setContent(String content) {
    this.content = content;
}

public String getDate() {
    return date;
}

public void setDate(String date) {
    this.date = date;
}

public String getSender() {
    return sender;
}

public void setSender(String sender) {
    this.sender = sender;
}

public int getIconId() {
    return iconId;
}

public void setIconId(int iconId) {
    this.iconId = iconId;
}

public boolean getIsRead() {
    return isRead;
}

public void setIsRead(boolean isRead) {
    this.isRead = isRead;
}

public boolean getIsRecieved() {
    return isRecieved;
}

public void setIsRecieved(boolean isRecieved) {
    this.isRecieved = isRecieved;
}