log.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/user"
android:text="用户名"
android:textSize="20sp"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/userEdit"
android:textSize="18sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/password"
android:text="密码"
android:textSize="20sp"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/passEdit"
android:textSize="18sp"/>
</LinearLayout>
package com.example.ex3_5;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.app.AlertDialog.Builder;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btn1, btn2;
LinearLayout login;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = findViewById(R.id.button1);
btn2 = findViewById(R.id.button2);
btn1.setOnClickListener(new mClick());
btn2.setOnClickListener(new mClick());//复制代码时注意修改调用对象 btn1.setOnClickListener(new mClick());
}
class mClick implements OnClickListener {
Builder dialog = new AlertDialog.Builder(MainActivity.this);
public void onClick(View arg0) {
if (arg0 == btn1) {
dialog.setTitle("警告");
// dialog.setIcon(R.drawable.icon1);
dialog.setMessage("本项操作可能导致信息泄露!");
dialog.setPositiveButton("确定", new okClick());
dialog.create();
dialog.show();
} else if (arg0 == btn2) {
login = (LinearLayout)getLayoutInflater().inflate(R.layout.log,null);
dialog.setTitle("用户登录").setMessage("请输入用户名和密码").setView(login);
dialog.setPositiveButton("确定", new loginClick());
dialog.setNegativeButton("退出", new exitClick());
// dialog.setIcon(R.drawable.icon2);
dialog.create();
dialog.show();
}
}
class okClick implements DialogInterface.OnClickListener {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}
class loginClick implements DialogInterface.OnClickListener {
EditText txt;
EditText pasw;
public void onClick(DialogInterface dialog, int which) {
txt = (EditText) login.findViewById(R.id.userEdit);//书本源代码中没有获取用户名进行判断
pasw = (EditText) login.findViewById(R.id.passEdit);//密码
if ((txt.getText().toString().equals("admin"))&&(pasw.getText().toString().equals("123456")))//书中源代码没有同时对用户名及密码进行判断
Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT).show();
else
Toast.makeText(getApplicationContext(), "用户或密码输入错误", Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
}
class exitClick implements DialogInterface.OnClickListener {
public void onClick(DialogInterface dialog, int which) {
MainActivity.this.finish();
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
>
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="打开普通对话框"
android:textSize="20sp"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="打开普通输入对话框"
android:textSize="20sp"
/>
</LinearLayout>