这期内容当中小编将会给大家带来有关Android中怎么使用SQLite实现记住密码功能，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
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具体内容如下
package com.example.alimjan.hello_world;
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 typeAdapter = new ArrayAdapter(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);
}
} 
