第八次作业

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E6E6E6"
    android:orientation="vertical"
    android:padding="10dp">
    <ImageView
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
        android:src="@drawable/qq" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:background="@android:color/white"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_account"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="账号:"
            android:textColor="#000"
            android:textSize="20sp" />
        <EditText
            android:id="@+id/et_account"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="10dp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:background="@android:color/white"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="密码:"
            android:textColor="#000"
            android:textSize="20sp" />
        <EditText
            android:id="@+id/et_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:inputType="textPassword"
            android:padding="10dp" />
    </LinearLayout>
    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:background="#3C8DC4"
        android:text="登录"
        android:textColor="@android:color/white"
        android:textSize="20sp" />
</LinearLayout>

package com.example.homework9;

import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {
private EditText et_account;
private EditText et_password;
private Button btn;
private SharedPreferences sp;
private FileInputStream fi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_account=(EditText) findViewById(R.id.et_account);
et_password=(EditText) findViewById(R.id.et_password);
btn=(Button) findViewById(R.id.btn);
btn.setOnClickListener(this);

}
@Override
public void onClick(View v) {
String s1=et_account.getText().toString();
String s2=et_password.getText().toString();
if (TextUtils.isEmpty(s2+s1)) {
Toast.makeText(this, "请输入QQ账号", 0).show();
}else {
sp=getSharedPreferences("data.txt", MODE_PRIVATE);
SharedPreferences.Editor editor=sp.edit();
editor.putString("s1", null);
editor.putString(s2, null);
editor.commit();
Toast.makeText(this, "登陆成功", 0).show();
String s3=sp.getString("s1", "");
String s4=sp.getString("s2", "");
Toast.makeText(this, "保存成功"+s1, 0).show();
}


}


}