android对话框点击清除按钮后，出现错误，请大神指导一二
imgcom.yarin.android.Examples_04_14;import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class Activity01 extends Activity
{
private ProgressDialog m_Dialog;
private EditText username;
private EditText password;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog dialog = new AlertDialog.Builder(Activity01.this)
.setTitle("登陆提示")//设置标题
.setMessage("这里需要登录！")//设置内容
.setPositiveButton("确定",//设置确定按钮
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
//点击“确定”转向登陆框
LayoutInflater factory = LayoutInflater.from(Activity01.this);
//得到自定义对话框
final View DialogView = factory.inflate(R.layout.dialog, null);
//创建对话框
AlertDialog dlg = new AlertDialog.Builder(Activity01.this)
.setTitle("登录框")
.setView(DialogView)//设置自定义对话框的样式
.setPositiveButton("确定", //设置"确定"按钮
new DialogInterface.OnClickListener() //设置事件监听
{
public void onClick(DialogInterface dialog, int whichButton)
{
//输入完成后，点击“确定”开始登陆
m_Dialog = ProgressDialog.show
(
Activity01.this,
"请等待...",
"正在为你登录...",
true
);
new Thread()
{
public void run()
{
try
{
sleep(3000);
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
//登录结束，取消m_Dialog对话框
m_Dialog.dismiss();
}
}
}.start();
}
})
.setNegativeButton("取消", //设置“取消”按钮
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
//点击"取消"按钮之后退出程序
Activity01.this.finish();
}
}).setNeutralButton("清除", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
//点击"清除"按钮之后清空账号密码
username=(EditText) findViewById(R.id.username);
password=(EditText) findViewById(R.id.password);
username.setText(" ");
password.setText(" ");
}
})
.create();//创建
dlg.show();//显示
}
}).setNeutralButton("退出",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
//点击"退出"按钮之后推出程序
Activity01.this.finish();
}
}).create();//创建按钮
// 显示对话框
dialog.show();
}
}
dialog.xml代码如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/username"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="账号"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/username"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:scrollHorizontally="true"
android:autoText="false"
android:capitalize="none"
android:gravity="fill_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/password"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="密码"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/password"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:scrollHorizontally="true"
android:autoText="false"
android:capitalize="none"
android:gravity="fill_horizontal"
android:password="true"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
出错截图如下：
点击“清除”后：
--------------------编程问答--------------------
你的对话框视图是动态加载的，所以应该是(EditText)DialogView.findViewById(R.id.username);--------------------编程问答-------------------- 直接findViewById是找不到的，要在DialogView里去findViewById，你的EditText是在DialogView里 --------------------编程问答-------------------- 我也遇到了一个一样的错，但不知道原因
--------------------编程问答-------------------- username=(EditText) findViewById(R.id.username);
password=(EditText) findViewById(R.id.password);
改成：
username=(EditText)DialogView.findViewById(R.id.username);
password=(EditText)DialogView.findViewById(R.id.password); --------------------编程问答-------------------- 下次问问题先打LOG ，ok?
补充：移动开发 , Android
