Android 初識數據庫存儲

1.點擊自動登錄或者記住密碼，點擊登錄跳轉到另一個頁面，另一個頁面的switch的狀態同主界面checkbox的狀態相同。

2.設置一個簡單的登錄頁面，輸入用戶名和密碼，點擊登錄跳轉到另一個頁面，在另一個頁面中點擊保存出現輸入的用戶名和密碼。

第一個主界面佈局及代碼：

佈局：

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".SharedPreferencesActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登錄"
        android:id="@+id/save"/>
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="記住密碼"
        android:id="@+id/cb2"
        android:layout_below="@+id/save" />
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自動登錄"
        android:id="@+id/cb1"
        android:layout_below="@+id/save" />
</RelativeLayout>

佈局效果：

代碼：

package com.example.administrator.jreduch09;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;

public class SharedPreferencesActivity extends AppCompatActivity {
    private Button save;
    private CheckBox cb1;
    private CheckBox cb2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        save=(Button)findViewById(R.id.save);
        cb1= (CheckBox) findViewById(R.id.cb1);
        cb2= (CheckBox) findViewById(R.id.cb2);

        final SharedPreferences sp=getSharedPreferences("userInfo",MODE_PRIVATE);
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               SharedPreferences.Editor editor =sp.edit();
                editor.putBoolean("1",cb1.isChecked());
                editor.putBoolean("2",cb2.isChecked());
                editor.commit();
                Intent intent=new Intent(SharedPreferencesActivity.this,SettingsActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        SharedPreferences sp=getSharedPreferences("switch",MODE_PRIVATE);
        boolean bb1=sp.getBoolean("3",false);
        boolean bb2=sp.getBoolean("4",false);
        cb1.setChecked(bb1);
        cb2.setChecked(bb2);
    }
}

第一個跳轉界面佈局及代碼：

佈局：

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context="com.example.administrator.jreduch09.SettingsActivity">
    <Switch
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="自動登錄"
        android:id="@+id/switch1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="105dp" />

    <Switch
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="記住密碼"
        android:id="@+id/switch2"
        android:layout_below="@+id/switch1"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="保存"
        android:id="@+id/save"
        android:layout_below="@+id/switch2"
        android:layout_alignParentStart="true" />
</RelativeLayout>

代碼：

package com.example.administrator.jreduch09;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Switch;

public class SettingsActivity extends AppCompatActivity {
    private Button save;
    private Switch switch1;
    private Switch switch2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        save= (Button) findViewById(R.id.save);
        switch1= (Switch) findViewById(R.id.switch1);
        switch2= (Switch) findViewById(R.id.switch2);
       final SharedPreferences sp=getSharedPreferences("switch",MODE_PRIVATE);

        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences.Editor editor =sp.edit();
                editor.putBoolean("3",switch1.isChecked());
                editor.putBoolean("4",switch2.isChecked());
                editor.commit();
            }
        });
    }
    @Override
    protected void onStart() {
        super.onStart();
        SharedPreferences sp=getSharedPreferences("userInfo",MODE_PRIVATE);
        boolean b1=sp.getBoolean("1",true);
        boolean b2=sp.getBoolean("2", true);
        switch1.setChecked(b1);
        switch2.setChecked(b2);
    }
}

完成效果：

第二個主界面佈局及代碼：

佈局：

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".SharedPreferencesActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="請輸入用戶名"
        android:id="@+id/user"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="請輸入密碼 "
        android:id="@+id/pwd"
        android:layout_below="@+id/user"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登錄"
        android:id="@+id/save"
        android:layout_below="@+id/pwd"
        />
</RelativeLayout>

代碼：

package com.example.administrator.jreduch09;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;

public class SharedPreferencesActivity extends AppCompatActivity {
    private EditText user;
    private EditText pwd;
    private Button save;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        user= (EditText) findViewById(R.id.user);
        pwd= (EditText) findViewById(R.id.pwd);
        save=(Button)findViewById(R.id.save);

        final SharedPreferences sp=getSharedPreferences("userInfo",MODE_PRIVATE);
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               SharedPreferences.Editor editor =sp.edit();
                editor.putString("userName", user.getText().toString());
                editor.putInt("userPwd", Integer.parseInt(pwd.getText().toString()));
                editor.commit();              
                Intent intent=new Intent(SharedPreferencesActivity.this,SettingsActivity.class);
                startActivity(intent);
            }
        });
    }

第二個跳轉界面佈局及代碼：

佈局：

<?xml version="1.0" encoding="utf-8"?>
<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"

    tools:context="com.example.administrator.jreduch09.Sp2Activity">
<TextView
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:id="@+id/showUser"
    />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/getUser"
        android:text="獲取數據"
        android:layout_below="@+id/showUser"
        />
</RelativeLayout>

代碼：

package com.example.administrator.jreduch09;

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Sp2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sp2);
        Button getUser = (Button) findViewById(R.id.getUser);
        final TextView showUser= (TextView) findViewById(R.id.showUser);
        final SharedPreferences sp=getSharedPreferences("userInfo",MODE_PRIVATE);
        getUser.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name= sp.getString("userName","NULL");
                String pwd= String.valueOf(sp.getInt("userPwd", 8888));
                showUser.setText("用戶名"+name+"\n"+"密碼"+pwd);
            }
        });
    }
}

完成效果：

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