安卓简单登录与注册
首先是效果图
1.MainXML
xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.bawei.day1010.MainActivity"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <EditText android:id="@+id/etName" android:drawableLeft="@mipmap/ic_launcher" android:hint="请输入用户名" android:layout_width="match_parent" android:layout_height="wrap_content"/> <Button android:id="@+id/butClearName" android:layout_centerVertical="true" android:background="@mipmap/ic_launcher" android:layout_alignParentRight="true" android:layout_width="30dp" android:layout_height="30dp"/> RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <EditText android:id="@+id/etPwd" android:drawableLeft="@mipmap/ic_launcher" android:hint="密码" android:inputType="textPassword" android:layout_width="match_parent" android:layout_height="wrap_content"/> <CheckBox android:layout_centerVertical="true" android:layout_alignParentRight="true" android:id="@+id/pwdShow" android:button="@mipmap/ic_launcher" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <Button android:id="@+id/butClearPwd" android:layout_centerVertical="true" android:background="@mipmap/ic_launcher" android:layout_toLeftOf="@id/pwdShow" android:layout_width="30dp" android:layout_height="30dp"/> RelativeLayout> <Button android:id="@+id/butLog" android:text="登录" android:layout_gravity="center_horizontal" android:layout_width="match_parent" android:layout_height="wrap_content"/> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:background="@drawable/nullstroke" android:textColor="#f00" android:id="@+id/butReg" android:text="注册" android:layout_alignParentLeft="true" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <Button android:background="@drawable/nullstroke" android:textColor="#f00" android:id="@+id/butForgetPwd" android:text="忘记密码" android:layout_alignParentRight="true" android:layout_width="wrap_content" android:layout_height="wrap_content"/> RelativeLayout> LinearLayout>2.空Shape
xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
shape>
3.Helper
public class MyHelper extends SQLiteOpenHelper {
public MyHelper(Context context) {
super(context, "mydb", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table mytb(id integer primary key autoincrement,name text,pwd text)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("drop table if exists mydb");
onCreate(db);
}
}
4.MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String TABLE = "mytb";
/**
* 请输入用户名
*/
private EditText mEtName;
/**
* 密码
*/
private EditText mEtPwd;
private CheckBox mPwdShow;
private Button mButClearName;
private Button mButClearPwd;
/**
* 登录
*/
private Button mButLog;
/**
* 注册
*/
private Button mButReg;
/**
* 忘记密码
*/
private Button mButForgetPwd;
private SQLiteDatabase db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
db = new MyHelper(this).getWritableDatabase();
}
private void initView() {
mEtName = (EditText) findViewById(R.id.etName);
mEtPwd = (EditText) findViewById(R.id.etPwd);
mPwdShow = (CheckBox) findViewById(R.id.pwdShow);
mPwdShow.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
//选择状态 显示明文--设置为可见的密码
mEtPwd.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
} else {
//默认状态显示密码--设置文本 要一起写才能起作用 InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD
mEtPwd.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
}
});
mButClearName = (Button) findViewById(R.id.butClearName);
mButClearName.setOnClickListener(this);
mButClearPwd = (Button) findViewById(R.id.butClearPwd);
mButClearPwd.setOnClickListener(this);
mButLog = (Button) findViewById(R.id.butLog);
mButLog.setOnClickListener(this);
mButReg = (Button) findViewById(R.id.butReg);
mButReg.setOnClickListener(this);
mButForgetPwd = (Button) findViewById(R.id.butForgetPwd);
mButForgetPwd.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.butClearName:
mEtName.setText("");
break;
case R.id.butClearPwd:
mEtPwd.setText("");
break;
case R.id.butLog:
String edNameLog1 = getEdString(mEtName);
String edPwdLog1 = getEdString(mEtPwd);
if(edNameLog1==null){
Toast.makeText(MainActivity.this,"请输入用户名",Toast.LENGTH_SHORT).show();
return;
}
if(edPwdLog1==null){
Toast.makeText(MainActivity.this,"请输入密码",Toast.LENGTH_SHORT).show();
return;
}
String sql="select * from mytb where name=? and pwd=?";
Cursor cursor = db.rawQuery(sql,new String[]{edNameLog1+"",edPwdLog1+""});
if(!cursor.moveToNext()){
Toast.makeText(MainActivity.this,"用户名或密码不匹配",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
}
break;
case R.id.butReg:
String edNameReg = getEdString(mEtName);
String edPwdReg= getEdString(mEtPwd);
if(edNameReg==null){
Toast.makeText(MainActivity.this,"请输入用户名",Toast.LENGTH_SHORT).show();
return;
}
if(edPwdReg==null){
Toast.makeText(MainActivity.this,"请输入密码",Toast.LENGTH_SHORT).show();
return;
}
//保存到数据库
ContentValues values=new ContentValues();
values.put("name",edNameReg);
values.put("pwd",edPwdReg);
long insert = db.insert(TABLE, null, values);
if(insert>0){
Toast.makeText(MainActivity.this,"注册成功,请登录",Toast.LENGTH_SHORT).show();
}
break;
case R.id.butForgetPwd:
break;
}
}
/**
* 得到editText的字符串
*/
public String getEdString(EditText editText) {
String s = editText.getText().toString();
if (s != null && !s.equals("")) {
return s;
}
return null;
}
}
提示:这里可以加入自动登录的,使用SharePreferences ,先保存一个标识,然后通过改变标识.每次进去先获取标识.