如图当点击按钮时，会先判断是否第一次登陆，如果是第一次登陆登陆则会弹出设置密码的弹窗，若果登陆过则弹出登陆弹窗
其中输入的密码会用MD5加密下
package com.org.demo.wangfeng.demo;
import com.org.wangfeng.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class HomeActivity extends Activity {
private Button bbButton;
private SharedPreferences mPref;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.homeactivity);
mPref = getSharedPreferences("config", MODE_PRIVATE);
bbButton = (Button) findViewById(R.id.bb_home);
bbButton.setOnClickListener(new OnclickItem());
}
private class OnclickItem implements View.OnClickListener {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String savedPassword = mPref.getString("password", null);
if(!TextUtils.isEmpty(savedPassword)){
//输入密码弹窗
showPasswordInputDialog();
}else{
//如果没有设置过，弹出设置密码的弹窗
showPasswordSetDialog();
}
}
}
/**
* 设置密码的弹窗
*/
private void showPasswordSetDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
final AlertDialog dialog = builder.create();
View view = View.inflate(this, R.layout.dialog_set_password, null);
dialog.setView(view, 0, 0, 0, 0);// 设置边距为0,保证在2.x的版本上运行没问题
final EditText edPassWord = (EditText) view
.findViewById(R.id.et_password);
final EditText edPassWordConfirm = (EditText) view
.findViewById(R.id.et_password_confirm);
Button btnOK = (Button) view.findViewById(R.id.btn_ok);
Button btnCancel = (Button) view.findViewById(R.id.btn_cancel);
btnOK.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String password = edPassWord.getText().toString();
String passwordConfirm = edPassWordConfirm.getText().toString();
if (!TextUtils.isEmpty(password) && !passwordConfirm.isEmpty()) {
// 当输入的2个内容相同
if (password.equals(passwordConfirm)) {
Toast.makeText(HomeActivity.this, "登陆成功",
Toast.LENGTH_SHORT).show();
// 将密码保存起来
mPref.edit()
.putString("password",
MD5Utils.encode(password)).commit();
dialog.dismiss();
} else {
Toast.makeText(HomeActivity.this, "2此输入密码不一致",
Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(HomeActivity.this, "输入内容不能为空",
Toast.LENGTH_SHORT).show();
}
}
});
btnCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
dialog.show();
}
/**
* 输入密码弹窗
*/
private void showPasswordInputDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
final AlertDialog dialog = builder.create();
View view = View.inflate(this, R.layout.dialog_input_password, null);
dialog.setView(view, 0, 0, 0, 0);
final EditText etPassword = (EditText) view
.findViewById(R.id.et_password);
Button btnOk = (Button) view.findViewById(R.id.btn_ok);
Button btnCancel = (Button) view.findViewById(R.id.btn_cancel);
btnOk.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String password = etPassword.getText().toString();
if (!TextUtils.isEmpty(password)) {
String savedPassword = mPref.getString("password", null);
if (MD5Utils.encode(password).equals(savedPassword)) {
Toast.makeText(HomeActivity.this, "登陆成功",
Toast.LENGTH_SHORT).show();
dialog.dismiss();
} else {
Toast.makeText(HomeActivity.this, "密码错误",
Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(HomeActivity.this, "输入内容不能为空",
Toast.LENGTH_SHORT).show();
}
}
});
btnCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
dialog.show();
}
}
package com.org.demo.wangfeng.demo;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Utils {
/**
* md5加密
*
* @param password
* @return
*/
public static String encode(String password) {
try {
MessageDigest instance = MessageDigest.getInstance("MD5");// 获取MD5算法对象
byte[] digest = instance.digest(password.getBytes());// 对字符串加密,返回字节数组
StringBuffer sb = new StringBuffer();
for (byte b : digest) {
int i = b & 0xff;// 获取字节的低八位有效值
String hexString = Integer.toHexString(i);// 将整数转为16进制
if (hexString.length() < 2) {
hexString = "0" + hexString;// 如果是1位的话,补0
}
sb.append(hexString);
}
return sb.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
// 没有该算法时,抛出异常, 不会走到这里
}
return "";
}
}
<?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:background="#fff"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#66ff6600"
android:gravity="center"
android:padding="10dp"
android:text="设置密码"
android:textColor="@android:color/black"
android:textSize="20sp" />
<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入密码"
android:inputType="textPassword" >
</EditText>
<EditText
android:id="@+id/et_password_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请再次输入密码"
android:inputType="textPassword" >
</EditText>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/btn_ok"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="确定" />
<Button
android:id="@+id/btn_cancel"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="取消" />
</LinearLayout>
</LinearLayout>
其实在android里 if(text ==null || text.length()==0)是有封装的。
在android.text.TextUtils里
public static boolean isEmpty(CharSequence str) {
if (str == null || str.length() == 0)
return true;
else
return false;
}
所以我们可以使用
TextUtils.isEmpty(text)
代替
if(text == null || text.length() == 0)
时间： 2024-10-06 04:39:00