2.作业8

 

 

 

 

 

 

package com.example.z9;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
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 Activity 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.et1);
    et_password=(EditText) findViewById(R.id.et2);
    btn=(Button) findViewById(R.id.bu1);
    btn.setOnClickListener(this);

    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
    case R.id.bu1:
    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();
    String saveinfo = et_account.getText().toString().trim();
    FileOutputStream fos;
    try {
        fos = openFileOutput("data.txt", Context.MODE_APPEND);
        fos.write(saveinfo.getBytes());
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    String saveinfo1 = et_password.getText().toString().trim();
    try {
        fos = openFileOutput("data.txt", Context.MODE_APPEND);
        fos.write(saveinfo1.getBytes());
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    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",150).show();
    }


    }

    }
    }

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.z9.MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:src="@drawable/dddss" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="250dp"
        android:layout_height="40dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/imageView1"
        android:layout_marginLeft="1dp"
        android:layout_marginTop="70dp"
        android:textSize="22sp"
        android:text="账号:" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="250dp"
        android:layout_height="40dp"
     android:layout_alignParentLeft="true"
        android:layout_marginTop="210dp"
         android:textSize="22sp"
        android:text="密码:" />

    <EditText
        android:id="@+id/et1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"     
        android:layout_alignParentTop="true"
        android:layout_marginLeft="55dp"
        android:layout_marginTop="165dp"
        android:ems="10" />

    <EditText
        android:id="@+id/et2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="55dp"
        android:layout_alignParentTop="true"
        android:layout_marginTop="210dp"
        android:ems="10"
        android:inputType="textPassword" />

    <Button
        android:id="@+id/bu1"
        android:layout_width="200dp"
        android:layout_height="40dp"
        android:layout_alignParentBottom="true"
        android:layout_alignRight="@+id/imageView1"
        android:layout_marginLeft="90dp"
        android:layout_marginBottom="75dp"
        android:background="#66ff00"
        android:onClick="click"
        android:text="登录" />

</RelativeLayout>