这个例子功能还算全面,实现了类似于qq登陆的界面,一开始输入账号和密码,然后点击"保存密码",则保存账号和密码信息,当下一次再登陆时,会把账号和密码回显,这里面我自己又加了一个"显示密码"的选项,用于用户检查是否输对了密码.这里面的关键点就是账号密码的存储与回显,我用了两种方式进行存储与回显,一种方式就是利用File,另一种就是利用SharedPreference,先看第一种方式:
MainActivity.java代码:
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Map;
public class MainActivity extends ActionBarActivity {
private EditText username, password;
private CheckBox checkBox,cb;
private Button land;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
checkBox = (CheckBox) findViewById(R.id.checkbox);
cb = (CheckBox) findViewById(R.id.cb);
land = (Button) findViewById(R.id.land);
Map<String,String> info = LandService.showUserInfo(MainActivity.this);
if (info != null) {
username.setText(info.get("username"));
password.setText(info.get("password"));
}
cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked ==false) {
password.setTransformationMethod(PasswordTransformationMethod.getInstance());
}
else
password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
}
});
land.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (username.getText().length() == 0 && password.getText().length() == 0)
Toast.makeText(MainActivity.this, "请输入用户名和密码", Toast.LENGTH_SHORT).show();
else {
if (username.getText().toString().equals("zhangsan") &&
password.getText().toString().equals("123456")) {
try {
Thread.sleep(3000);
Toast.m