1.编写布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="亲输入用户名" />
<EditText
android:id="@+id/et_username"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="亲输入密码" />
<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<CheckBox
android:id="@+id/cb_remember_psw"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="记住密码" />
<Button
android:onClick="login"
android:layout_alignParentRight="true"
android:id="@+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="登录" />
</RelativeLayout>
</LinearLayout>
2.编写Activity
public class LoginUIActivity extends Activity {
private EditText et_username = null;
private EditText et_password = null;
private CheckBox cb_remeber_password = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.et_username = (EditText) this.findViewById(R.id.et_username);
this.et_password = (EditText) this.findViewById(R.id.et_password);
this.cb_remeber_password = (CheckBox) this
.findViewById(R.id.cb_remember_psw);
HashMap<String, String> info = LoginService.getInfo(this);
if(info != null) {
this.et_username.setText(info.get("username"));
this.et_password.setText(info.get("password"));
}
}
public void login(View view) {
String username = this.et_username.getText().toString().trim();
String password = this.et_password.getText().toString().trim();
if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {
Toast.makeText(this, "用户名或密码不能为空", 0).show();
} else {
if (this.cb_remeber_password.isChecked()) {
boolean result = LoginService.saveInfo(this, username, password);
if(result) {
Toast.makeText(this, "保存密码成功", 0).show();
}
}
if ("weijie".equals(username) && "123".equals(password)) {
Toast.makeText(this, "登录成功", 0).show();
} else {
Toast.makeText(this, "登录失败", 0).show();
}
}
}
}
3.编写业务类
public class LoginService {
public static boolean saveInfo(Context context, String username,
String password) {
//getFileDir : /data/data/包名/files
//getCacheDir : /data/data/包名/cache
File file = new File(context.getFilesDir(), "info.txt");
try {
FileOutputStream fos = new FileOutputStream(file);
fos.write((username + "=" + password).getBytes());
fos.flush();
fos.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public static HashMap<String, String> getInfo(Context context) {
File file = new File(context.getFilesDir(), "info.txt");
try {
FileInputStream fis = new FileInputStream(file);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String[] result = br.readLine().split("=");
HashMap<String, String> map = new HashMap<String, String>();
map.put("username", result[0]);
map.put("password", result[1]);
br.close();
return map;
} catch (Exception e) {
Toast.makeText(context, "无法读取用户信息", 0).show();
}
return null;
}
}