第十一十二周作业

 

 

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <EditText
        android:id="@+id/et_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="保存的数据" />

    <Button
        android:id="@+id/bt_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click1"
        android:text="保存数据"/>
    <EditText
        android:id="@+id/et_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />
    <Button
        android:id="@+id/bt_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click2"
        android:text="读取数据"/>
</LinearLayout>

package com.example.badboy.aaa;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

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

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.bt_1);
        findViewById(R.id.bt_2);
        findViewById(R.id.bt_1);
        findViewById(R.id.bt_2);
    }
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.bt_1:
                String fileName="data.txt";
                String content=((EditText)findViewById(R.id.et_1)).getText().toString();
                FileOutputStream fos=null;
                try{
                    fos=openFileOutput(fileName,MODE_PRIVATE);
                    fos.write(content.getBytes());
                } catch (Exception e) {
                    e.printStackTrace();
                }finally {
                    try {
                        if (fos != null) {
                            fos.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                break;
            case R.id.bt_2:
                content = "";
                FileInputStream fis=null;
                try{
                    fis=openFileInput("data.txt");
                    byte[] buffer=new byte[fis.available()];
                    fis.read(buffer);
                    content=new String(buffer);
                    ((EditText)findViewById(R.id.et_2)).setText(content);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    try{
                        if (fis != null) {
                            fis.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                break;
        }
    }
}

 

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="账号"
        android:textSize="25dp"
        android:layout_above="@+id/et2"
        android:layout_alignLeft="@+id/tv2"
        android:layout_alignStart="@+id/tv2" />
    <EditText
        android:id="@+id/et1"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:hint="请输入用户名"
        android:layout_toRightOf="@id/tv1"
        android:text="11515" />
    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="密码"
        android:textSize="25dp"
        android:layout_margin="10dp"
        android:layout_below="@id/tv1"/>
    <EditText
        android:id="@+id/et2"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:layout_toRightOf="@id/tv2"
        android:layout_below="@id/et1"
        android:layout_marginTop="10dp"
        android:text="3165" />
    <CheckBox
        android:id="@+id/cb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv2"
        android:onClick="cbclick"/>
    <TextView
        android:id="@+id/tv3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="记住密码"
        android:layout_toRightOf="@id/cb1"
        android:layout_below="@id/tv2"
        android:textSize="20dp"/>
    <CheckBox
        android:id="@+id/cb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv2"
        android:layout_toRightOf="@id/tv3"/>
    <TextView
        android:id="@+id/tv4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自动登录"
        android:layout_toRightOf="@id/cb2"
        android:layout_below="@id/tv2"
        android:textSize="20dp" />
    <Button
        android:id="@+id/bt1"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:text="登录"
        android:layout_toRightOf="@id/tv4"
        android:layout_below="@id/et2"
        android:onClick="btclick"/>



</RelativeLayout>

package com.example.badboy.bbb;

import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void btclick(View view){
        String et1=((EditText)(findViewById(R.id.et1))).getText().toString();
        String et2=((EditText)(findViewById(R.id.et2))).getText().toString();
        SharedPreferences sp=getSharedPreferences("cdate",MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();
        editor.putString("zh", et1);
        editor.putString("mm", et2);
        editor.commit();
    }
    public void cbclick(View view){
        SharedPreferences sp=getSharedPreferences("cdate", MODE_PRIVATE);
        String zh=sp.getString("zh", "");
        String mm=sp.getString("mm", "");
        EditText et1=(EditText)findViewById(R.id.et1);
        EditText et2=(EditText)findViewById(R.id.et2);
        et1.setText(zh);
        et2.setText(mm);
    }
}