在Android下有类似于session的东西，叫做Application， getApplication()用法

在Android上有类似于session的东西，叫做Application。
在Android上有类似于session的东西，叫做Application。

1、你可以新建一个类，例如:HelloWordApplication.java 必须extends Application（名字随你取）
在这个类里面设定你要全局的数据变量，例如:private String loginName;
然后生成它的get、set方法。
2、在AndroidManifest.xml文件中配置你的Application类，方法如下：
<application android:icon="@drawable/icon" android:label="@string/app_name" android:name="HelloWordApplication">
<activity >
//略
</activity>
</application>
就是在<application>标签儿中增加android:name="HelloWordApplication"的属性配置。
3、在使用的时候：
HelloWordApplicationapplication = (HelloWordApplication)getApplication();
application.setLoginName("百度");
则就将"百度"保存到了Application里，其他地方要用的时候，application.getLoginName();就可以了。

android getApplication()使用

Java代码


package com.hyzing;

import android.app.Application;

public class MySystemAppcation extends Application{

private int curIndex;

public int getCurIndex() {

return curIndex;

}

public void setCurIndex(int curIndex) {

this.curIndex = curIndex;

}

@Override

public void onCreate() {

super.onCreate();

}

@Override

public void onTerminate() {

super.onTerminate();

}

}

Java代码


package com.hyzing;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

public class SystemtestActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.main);

MySystemAppcation application = (MySystemAppcation) this

.getApplication();

System.out.println("++++++++++++++"+application);

Log.i("data", "===============" + application.getCurIndex());

application.setCurIndex(5);

Intent intent = new Intent();

Bundle bundle = new Bundle();

bundle.putString("checkIn", "0");

bundle.putBoolean("managerUser", true);

intent.putExtras(bundle);

intent.setClass(<span style="color: #ff0000;">SystemtestActivity.this</span>, PrintActivity.class);

startActivity(intent);

}

}

Java代码


package com.hyzing;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

public class PrintActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

<span style="color: #ff0000;">super.onCreate(savedInstanceState);</span>

MySystemAppcation application = (MySystemAppcation) this

.getApplication();

Log.i("data", "" + application.getCurIndex());

application.setCurIndex(6);

Intent intent = new Intent();

Bundle bundle = new Bundle();

bundle.putString("checkIn", "0");

bundle.putBoolean("managerUser", true);

intent.putExtras(bundle);

intent.setClass(PrintActivity.this, PrintAgainActivity.class);

startActivity(intent);

}

}

Java代码


package com.hyzing;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

public class PrintAgainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

<span style="color: #ff0000;">super.onCreate(savedInstanceState);</span>

final MySystemAppcation application = (MySystemAppcation) this

.getApplication();

Log.i("data", "" + application.getCurIndex());

}

}

Java代码


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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.hyzing"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk android:minSdkVersion="15" />

<application android:name=".MySystemAppcation"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name" >

<activity

android:name=".SystemtestActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<activity

android:name=".PrintActivity"

android:label="@string/app_name" >

</activity>

<activity

android:name=".PrintAgainActivity"

android:label="@string/app_name" >

</activity>

</application>

</manifest>