本文实例为大家分享了Android SQLite优化记住密码功能的具体代码，供大家参考，具体内容如下

package com.example.alimjan.hello_world;/** * Created by alimjan on 7/4/2017. */ import com.example.alimjan.hello_world.bean.UserInfo; import com.example.alimjan.hello_world.dataBase.UserDBHelper; import com.example.alimjan.hello_world.Utils.DateUtil; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnFocusChangeListener; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.EditText; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemSelectedListener;public class class_4_2_3 extends AppCompatActivity implements OnClickListener, OnFocusChangeListener { private RadioGroup rg_login; private RadioButton rb_password; private RadioButton rb_verifycode; private EditText et_phone; private TextView tv_password; private EditText et_password; private Button btn_forget; private CheckBox ck_remember; private Button btn_login; private int mRequestCode = 0; private int mType = 0; private boolean bRemember = false; private String mPassword = "111111"; private String mVerifyCode; private UserDBHelper mHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.code_4_2_3); rg_login = (RadioGroup) findViewById(R.id.rg_login); rb_password = (RadioButton) findViewById(R.id.rb_password); rb_verifycode = (RadioButton) findViewById(R.id.rb_verifycode); et_phone = (EditText) findViewById(R.id.et_phone); tv_password = (TextView) findViewById(R.id.tv_password); et_password = (EditText) findViewById(R.id.et_password); btn_forget = (Button) findViewById(R.id.btn_forget); ck_remember = (CheckBox) findViewById(R.id.ck_remember); btn_login = (Button) findViewById(R.id.btn_login); rg_login.setOnCheckedChangeListener(new RadioListener()); ck_remember.setOnCheckedChangeListener(new CheckListener()); et_phone.addTextChangedListener(new HideTextWatcher(et_phone)); et_password.addTextChangedListener(new HideTextWatcher(et_password)); btn_forget.setOnClickListener(this); btn_login.setOnClickListener(this); et_password.setOnFocusChangeListener(this); ArrayAdapter<String> typeAdapter = new ArrayAdapter<String>(this, R.layout.item_select, typeArray); typeAdapter.setDropDownViewResource(R.layout.item_dropdown); Spinner sp_type = (Spinner) findViewById(R.id.sp_type); sp_type.setPrompt("请选择用户类型"); sp_type.setAdapter(typeAdapter); sp_type.setSelection(mType); sp_type.setOnItemSelectedListener(new TypeSelectedListener()); } private class RadioListener implements RadioGroup.OnCheckedChangeListener { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (checkedId == R.id.rb_password) { tv_password.setText("登录密码："); et_password.setHint("请输入密码"); btn_forget.setText("忘记密码"); ck_remember.setVisibility(View.VISIBLE); } else if (checkedId == R.id.rb_verifycode) { tv_password.setText("　验证码："); et_password.setHint("请输入验证码"); btn_forget.setText("获取验证码"); ck_remember.setVisibility(View.INVISIBLE); } } } private String[] typeArray = {"个人用户", "公司用户"}; class TypeSelectedListener implements OnItemSelectedListener { public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { mType = arg2; } public void onNothingSelected(AdapterView<?> arg0) { } } private class CheckListener implements CompoundButton.OnCheckedChangeListener { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (buttonView.getId() == R.id.ck_remember) { bRemember = isChecked; } } } private class HideTextWatcher implements TextWatcher { private EditText mView; private int mMaxLength; private CharSequence mStr; public HideTextWatcher(EditText v) { super(); mView = v; mMaxLength = ViewUtil.getMaxLength(v); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { mStr = s; } @Override public void afterTextChanged(Editable s) { if (mStr == null || mStr.length() == 0) return; if ((mStr.length() == 11 && mMaxLength == 11) || (mStr.length() == 6 && mMaxLength == 6)) { ViewUtil.hideOneInputMethod(class_4_2_3.this, mView); } } } @Override public void onClick(View v) { String phone = et_phone.getText().toString(); if (v.getId() == R.id.btn_forget) { if (phone==null || phone.length()<11) { Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_SHORT).show(); return; } if (rb_password.isChecked() == true) { Intent intent = new Intent(this, class_4_2_3_1.class); intent.putExtra("phone", phone); startActivityForResult(intent, mRequestCode); } else if (rb_verifycode.isChecked() == true) { mVerifyCode = String.format("%06d", (int)(Math.random()*1000000%1000000)); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("请记住验证码"); builder.setMessage("手机号"+phone+"，本次验证码是"+mVerifyCode+"，请输入验证码"); builder.setPositiveButton("好的", null); AlertDialog alert = builder.create(); alert.show(); } } else if (v.getId() == R.id.btn_login) { if (phone==null || phone.length()<11) { Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_SHORT).show(); return; } if (rb_password.isChecked() == true) { if (et_password.getText().toString().equals(mPassword) != true) { Toast.makeText(this, "请输入正确的密码", Toast.LENGTH_SHORT).show(); return; } else { loginSuccess(); } } else if (rb_verifycode.isChecked() == true) { if (et_password.getText().toString().equals(mVerifyCode) != true) { Toast.makeText(this, "请输入正确的验证码", Toast.LENGTH_SHORT).show(); return; } else { loginSuccess(); } } } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == mRequestCode && data!=null) { //用户密码已改为新密码 mPassword = data.getStringExtra("new_password"); } } //从修改密码页面返回登录页面，要清空密码的输入框 @Override protected void onRestart() { et_password.setText(""); super.onRestart(); } @Override protected void onResume() { super.onResume(); mHelper = UserDBHelper.getInstance(this, 2); mHelper.openWriteLink(); } @Override protected void onPause() { super.onPause(); mHelper.closeLink(); } private void loginSuccess() { String desc = String.format("您的手机号码是%s，类型是%s。恭喜你通过登录验证，点击“确定”按钮返回上个页面", et_phone.getText().toString(), typeArray[mType]); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("登录成功"); builder.setMessage(desc); builder.setPositiveButton("确定返回", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }); builder.setNegativeButton("我再看看", null); AlertDialog alert = builder.create(); alert.show(); if (bRemember) { UserInfo info = new UserInfo(); info.phone = et_phone.getText().toString(); info.password = et_password.getText().toString(); info.update_time = DateUtil.getCurDateStr("yyyy-MM-dd HH:mm:ss"); mHelper.insert(info); } } //为什么光标进入密码框事件不选onClick？因为要点两下才会触发onClick动作（第一下是切换焦点动作） @Override public void onFocusChange(View v, boolean hasFocus) { String phone = et_phone.getText().toString(); if (v.getId() == R.id.et_password) { if (phone.length() > 0 && hasFocus == true) { UserInfo info = mHelper.queryByPhone(phone); if (info != null) { et_password.setText(info.password); }else{ et_password.setText(""); } } } } public static void startHome(Context mContext) { Intent intent = new Intent(mContext, class_4_2_3.class); mContext.startActivity(intent); }}<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:focusable="true" android:focusableInTouchMode="true" android:orientation="vertical" android:padding="5dp" > <RadioGroup android:id="@+id/rg_login" android:layout_width="match_parent" android:layout_height="60dp" android:orientation="horizontal" > <RadioButton android:id="@+id/rb_password" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:checked="true" android:gravity="left|center" android:text="密码登录" android:textColor="@color/black" android:textSize="17sp" /> <RadioButton android:id="@+id/rb_verifycode" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:checked="false" android:gravity="left|center" android:text="验证码登录" android:textColor="@color/black" android:textSize="17sp" /> </RadioGroup> <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_type" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="　　我是：" android:textColor="@color/black" android:textSize="17sp" /> <Spinner android:id="@+id/sp_type" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_toRightOf="@+id/tv_type" android:gravity="left|center" android:spinnerMode="dialog" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_phone" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="手机号码：" android:textColor="@color/black" android:textSize="17sp" /> <EditText android:id="@+id/et_phone" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@+id/tv_phone" android:background="@drawable/editext_selector" android:gravity="left|center" android:hint="请输入手机号码" android:inputType="number" android:maxLength="11" android:textColor="@color/black" android:textColorHint="@color/grey" android:textCursorDrawable="@drawable/text_cursor" android:textSize="17sp" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_password" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="登录密码：" android:textColor="@color/black" android:textSize="17sp" /> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_toRightOf="@+id/tv_password" > <EditText android:id="@+id/et_password" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="5dp" android:layout_marginTop="5dp" android:background="@drawable/editext_selector" android:gravity="left|center" android:hint="请输入密码" android:inputType="numberPassword" android:maxLength="6" android:textColor="@color/black" android:textColorHint="@color/grey" android:textCursorDrawable="@drawable/text_cursor" android:textSize="17sp" /> <Button android:id="@+id/btn_forget" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="right" android:gravity="center" android:text="忘记密码" android:textColor="@color/black" android:textSize="17sp" /> </FrameLayout> </RelativeLayout> <CheckBox android:id="@+id/ck_remember" android:layout_width="match_parent" android:layout_height="wrap_content" android:button="@drawable/checkbox_selector" android:checked="false" android:padding="10dp" android:text="记住密码" android:textColor="@color/black" android:textSize="17sp" /> <Button android:id="@+id/btn_login" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登录" android:textColor="@color/black" android:textSize="22sp" /></LinearLayout>package com.example.alimjan.hello_world;/** * Created by alimjan on 7/4/2017. */ import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.View.OnClickListener; import android.widget.EditText; import android.widget.Toast;public class class_4_2_3_1 extends AppCompatActivity implements OnClickListener { private EditText et_password_first; private EditText et_password_second; private EditText et_verifycode; private String mVerifyCode; private String mPhone; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.code_4_2_3_1); et_password_first = (EditText) findViewById(R.id.et_password_first); et_password_second = (EditText) findViewById(R.id.et_password_second); et_verifycode = (EditText) findViewById(R.id.et_verifycode); findViewById(R.id.btn_verifycode).setOnClickListener(this); findViewById(R.id.btn_confirm).setOnClickListener(this); mPhone = getIntent().getStringExtra("phone"); } @Override public void onClick(View v) { if (v.getId() == R.id.btn_verifycode) { if (mPhone==null || mPhone.length()<11) { Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_SHORT).show(); return; } mVerifyCode = String.format("%06d", (int) (Math.random() * 1000000 % 1000000)); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("请记住验证码"); builder.setMessage("手机号"+mPhone+"，本次验证码是"+mVerifyCode+"，请输入验证码"); builder.setPositiveButton("好的", null); AlertDialog alert = builder.create(); alert.show(); } else if (v.getId() == R.id.btn_confirm) { String password_first = et_password_first.getText().toString(); String password_second = et_password_second.getText().toString(); if (password_first==null || password_first.length()<6 || password_second==null || password_second.length()<6) { Toast.makeText(this, "请输入正确的新密码", Toast.LENGTH_SHORT).show(); return; } if (password_first.equals(password_second) != true) { Toast.makeText(this, "两次输入的新密码不一致", Toast.LENGTH_SHORT).show(); return; } if (et_verifycode.getText().toString().equals(mVerifyCode) != true) { Toast.makeText(this, "请输入正确的验证码", Toast.LENGTH_SHORT).show(); return; } else { Toast.makeText(this, "密码修改成功", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(); intent.putExtra("new_password", password_first); setResult(Activity.RESULT_OK, intent); finish(); } } } public static void startHome(Context mContext) { Intent intent = new Intent(mContext, class_4_2_3_1.class); mContext.startActivity(intent); }}<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:focusable="true" android:focusableInTouchMode="true" android:orientation="vertical" android:padding="5dp" > <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_password_first" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="输入新密码：" android:textColor="@color/black" android:textSize="17sp" /> <EditText android:id="@+id/et_password_first" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@+id/tv_password_first" android:background="@drawable/editext_selector" android:gravity="left|center" android:hint="请输入新密码" android:inputType="numberPassword" android:maxLength="11" android:textColor="@color/black" android:textColorHint="@color/grey" android:textCursorDrawable="@drawable/text_cursor" android:textSize="17sp" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_password_second" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="确认新密码：" android:textColor="@color/black" android:textSize="17sp" /> <EditText android:id="@+id/et_password_second" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="5dp" android:layout_marginTop="5dp" android:layout_toRightOf="@+id/tv_password_second" android:background="@drawable/editext_selector" android:gravity="left|center" android:hint="请再次输入新密码" android:inputType="numberPassword" android:maxLength="11" android:textColor="@color/black" android:textColorHint="@color/grey" android:textCursorDrawable="@drawable/text_cursor" android:textSize="17sp" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="60dp" > <TextView android:id="@+id/tv_verifycode" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:gravity="center" android:text="　　验证码：" android:textColor="@color/black" android:textSize="17sp" /> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_toRightOf="@+id/tv_verifycode" > <EditText android:id="@+id/et_verifycode" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="5dp" android:layout_marginTop="5dp" android:background="@drawable/editext_selector" android:gravity="left|center" android:hint="请输入验证码" android:inputType="numberPassword" android:maxLength="6" android:textColor="@color/black" android:textColorHint="@color/grey" android:textCursorDrawable="@drawable/text_cursor" android:textSize="17sp" /> <Button android:id="@+id/btn_verifycode" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="right" android:gravity="center" android:text="获取验证码" android:textColor="@color/black" android:textSize="17sp" /> </FrameLayout> </RelativeLayout> <Button android:id="@+id/btn_confirm" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="确定" android:textColor="@color/black" android:textSize="22sp" /></LinearLayout>

当输入完手机号之后，点击密码编辑框时，从数据库查看内容，如果含有该号的密码则自动添加，如果没有则空。勾选记住密码选项之后，如果登陆成功则保存到数据库。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。