Android 利用Application对象存取公共数据

package com.example.applicationtest;

import android.app.Application;

public class MyApplication extends Application {
 
 public String appVersion = "v1.0";
 
 //当前登录用户
 private User loginUser = new User();
 
 
 public User getLoginUser(){
  return loginUser;
 }
 
 public void userLogin(User user){
  loginUser.setUserId(user.getUserId());
  loginUser.setUserName(user.getUserName());
 }
 
 public void userLogout(){
  loginUser = new User();
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.applicationtest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:name="com.example.applicationtest.MyApplication"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.applicationtest.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.example.applicationtest;

import android.os.Bundle;
import android.app.Activity;

public class MainActivity extends Activity {
 
 private MyApplication mApplication;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  // 获取整个应用的Application对象
  // 在不同的Activity中获取的对象是同一个
  mApplication = (MyApplication) getApplication();
  
 }
 
 /**
  * 一般只有在登录界面中设置登录用户信息，在其他的Activity中
  * 只要通过Application对象就可以获取登录用户信息
  */
 private void login(){
  User user = new User();
  user.setUserId(1);
  user.setUserName("Raysmond");
  // 将登录用户信息保存到Application对象中
  mApplication.userLogin(user);
 }

}

Activity1.java

package com.example.applicationtest;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;

public class Activity1 extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_activity1);
  // 切换到Activity2
  gotoActivity2();
 }
 
 private void gotoActivity2(){
  Intent intent = new Intent(Activity1.this,Activity2.class);
  Bundle bundle = new Bundle();
  bundle.putLong("USER_ID", 1);
  bundle.putString("USER_NAME", "Raysmond");
  intent.putExtras(bundle);
  startActivity(intent);
 }

}
Activity2.java

package com.example.applicationtest;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;

public class Activity2 extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_activity2);
  getUserInfo();
  
 }
 
 /**
  * 从上一个Activity获取传递过来的数据
  */
 private void getUserInfo(){
  Intent intent = this.getIntent();
  Bundle bundle = intent.getExtras();
  long userId = bundle.getLong("USER_ID", -1L);
  String userName = bundle.getString("USER_NAME");  
 }

}

package com.raysmond.component;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

public class EditTextWithLabel extends LinearLayout{
 
 TextView label;
 EditText text;
 
 public EditTextWithLabel(Context context,AttributeSet attrs){
  super(context, attrs);
  setOrientation(HORIZONTAL);
  LayoutInflater.from(context).inflate(R.layout.edit_text_with_label, this, true);
  label = (TextView) findViewById(R.id.comp_le_label);
  text = (EditText) findViewById(R.id.comp_le_content);
  
 }
 
 public boolean setSubViewFocus(){
  return text.requestFocus();
 }
 
 public EditText getEditText(){
  return text;
 }
 
 public String getContent(){
  return text.getText().toString();
 }
 
 public void setContent(String str){
  text.setText(str);
 }
 
 public void setError(String error){
  text.setError(error);
 }
 
}

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:id="@+id/comp_le_label"
        android:layout_width="wrap_content"
        android:layout_weight="3"
        android:layout_height="wrap_content"
        android:paddingRight="5dp"
        android:text="Label"
        android:textSize="25sp"
        android:gravity="center"/>

    <EditText
        android:inputType="text"
        android:id="@+id/comp_le_content"
        android:layout_width="wrap_content"
        android:layout_weight="7"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        >
        <requestFocus />
    </EditText>
</merge>

<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=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:id="@+id/hello_world"
        android:layout_height="wrap_content"
        android:textSize="28sp"
        android:text="带Label的输入框组件" />
   
    <com.raysmond.component.EditTextWithLabel
        android:id="@+id/test_component"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/hello_world"
         />

</RelativeLayout>

package com.raysmond.activity;

import com.raysmond.component.EditTextWithLabel;
import com.raysmond.component.R;

import android.os.Bundle;
import android.app.Activity;

public class MainActivity extends Activity {
 EditTextWithLabel component;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  findView();
  
 }
 
 public void findView(){
  component = (EditTextWithLabel) findViewById(R.id.test_component);
  component.setSubViewFocus();
 }
 
}

String MODEL The end-user-visible name for the end product.

String SDK This constant is deprecated. Use SDK_INT to easily get this as an integer.

String RELEASE The user-visible version string.

private void getPhoneStatus(){

TelephonyManager phoneMgr=(TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);     
String model = Build.MODEL; //手机型号
String phoneNum = phoneMgr.getLine1Number();//本机电话号码
String sdkVersion = Build.VERSION.SDK;//SDK版本号
String osVersion = Build.VERSION.RELEASE;//Firmware/OS 版本号
}