Java 从对话框中获取数据并将其发布到MainActivity
我是android新手。我已经创建了一个Java 从对话框中获取数据并将其发布到MainActivity,java,android,Java,Android,我是android新手。我已经创建了一个对话框,在这个对话框中,我有2个编辑文本字段 我想从这2个EditText字段中获取值(用户输入),并将其显示到MainActivity中的2个单独的TextView字段,但无论我如何尝试,我都无法从EditText字段中获取值 请帮忙。我到现在为止的代码 package edu.arnab.simpledialogmenu; import android.app.AlertDialog; import android.content.DialogInt
对话框
,在这个对话框
中,我有2个编辑文本
字段
我想从这2个EditText
字段中获取值(用户输入),并将其显示到MainActivity
中的2个单独的TextView
字段,但无论我如何尝试,我都无法从EditText
字段中获取值
请帮忙。我到现在为止的代码
package edu.arnab.simpledialogmenu;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity implements OnClickListener {
RelativeLayout layout;
TextView tvTitle, tvCaption, tvStudio;
EditText gTitle, gCaption;
String title, caption;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
layout = (RelativeLayout) findViewById(R.id.relative1);
tvTitle = (TextView) findViewById(R.id.textView1);
tvCaption = (TextView) findViewById(R.id.textView2);
tvStudio = (TextView) findViewById(R.id.textView3);
registerForContextMenu(layout);
registerForContextMenu(tvTitle);
}
@Override
public void onCreateContextMenu(android.view.ContextMenu menu, android.view.View v, android.view.ContextMenu.ContextMenuInfo menuInfo)
{
if(v == layout)
{
menu.add(1, 1, 0, "Make Background Yellow");
menu.add(1, 2, 0, "Make Background Cyan");
}
else if(v == tvTitle)
{
menu.removeGroup(1);
menu.add(2, 3, 0, "Make Title COD");
menu.add(2, 4, 0, "Make Title NFS");
}
super.onCreateContextMenu(menu, v, menuInfo);
};
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId())
{
case 1:
layout.setBackgroundColor(Color.YELLOW);
break;
case 2:
layout.setBackgroundColor(Color.CYAN);
break;
case 3:
tvTitle.setText("Title: Call of Duty");
break;
case 4:
tvTitle.setText("Title: Need for Speed");
break;
}
return super.onContextItemSelected(item);
}
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(1, 1, 1, "Game Entry Dialog");
menu.add(1, 2, 1, "Change Background");
menu.add(1, 3, 1, "Exit App");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
String text = null;
switch(item.getItemId())
{
case 1:
text = item.getTitle().toString();
// Show Game Dialog
AlertDialog.Builder ab = new AlertDialog.Builder(this);
ab.setTitle("New Game Entry Dialog");
View view = getLayoutInflater().inflate(R.layout.dlg_layout, null);
ab.setView(view);
gTitle = (EditText) view.findViewById(R.id.editTitle);
gCaption = (EditText) view.findViewById(R.id.editCaption);
title = gTitle.getText().toString();
caption = gCaption.getText().toString();
ab.setPositiveButton("OKAY IT", this);
ab.setNegativeButton("CANCEL IT", this);
AlertDialog ad = ab.create();
ad.show();
break;
case 2:
text = item.getTitle().toString();
layout.setBackgroundColor(Color.GREEN);
tvTitle.setBackgroundColor(Color.WHITE);
tvCaption.setBackgroundColor(Color.LTGRAY);
break;
case 3:
text = item.getTitle().toString();
finish();
break;
}
Toast.makeText(this, "You have selected menu item " + text, 3000).show();
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
switch(arg1)
{
case DialogInterface.BUTTON_POSITIVE:
//take text from dialog fields and show all info on MainActivity
tvTitle.setText(title);
tvCaption.setText(caption);
break;
case DialogInterface.BUTTON_NEGATIVE:
Toast.makeText(this, "You cancelled dialog entry", 300).show();
break;
}
}
}
用此命令重新单击
onClick
方法
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
switch(arg1)
{
case DialogInterface.BUTTON_POSITIVE:
//take text from dialog fields and show all info on MainActivity
//these are changes
title = gTitle.getText().toString();
caption = gCaption.getText().toString();
tvTitle.setText(title);
tvCaption.setText(caption);
break;
case DialogInterface.BUTTON_NEGATIVE:
Toast.makeText(this, "You cancelled dialog entry", 300).show();
break;
}
}
简单地说,您也可以使用接口和事件总线“我无法从EditText字段获取值。”为什么?是什么阻止了你?编写以下代码
title=gTitle.getText().toString();caption=gCaption.getText().toString()
ononClick
method ofBUTTON\u POSITIVE
@Kuffs与我的代码到目前为止,我只得到空白值。现在变量名title
或caption
@aksacha中有一个值,我测试过你的代码。当我将代码移动到onclick
按钮的方法中时,我得到错误视图未定义
。如果您发现此答案有帮助,您可以向上投票,以便其他人可以从中获得帮助。我已向上投票您的答案,但我收到以下通知:感谢反馈!声誉低于15的人所投的票将被记录,但不会改变公开显示的帖子分数。对不起,没问题。。快乐编码:)