不同APP通过SharedPreferences传递数据（共享数据）

1、写入数据APP

[java] view plain copy

print?

1. public class MainActivity extends Activity {  
2.   
3.     private SharedPreferences putPreferences;  
4.     private Editor putEditor;  
5.   
6.     @Override  
7.     protected void onCreate(Bundle savedInstanceState) {  
8.         super.onCreate(savedInstanceState);  
9.         setContentView(R.layout.activity_main);  
10.   
11.         // 将服务器信息写入serverInfo.xml  
12.         findViewById(R.id.buttonPut).setOnClickListener( new View.OnClickListener() {  
13.               
14.             @Override  
15.             public void onClick(View v) {  
16.                 // TODO Auto-generated method stub  
17.                 putPreferences = getSharedPreferences("serverInfo", Context.MODE_WORLD_READABLE);  
18.                 putEditor = putPreferences.edit();  
19.                 putEditor.putString("serverIP", "192.168.1.102");  
20.                 putEditor.putString("password", "123456");  
21.                 putEditor.commit();  
22.                 Toast.makeText(MainActivity.this,"服务器信息成功写入serverInfo.xml", Toast.LENGTH_LONG).show();  
23.             }  
24.                       
25.         });  
26.           
27.     }  
28.   
29.     @Override  
30.     public boolean onCreateOptionsMenu(Menu menu) {  
31.         // Inflate the menu; this adds items to the action bar if it is present.  
32.         getMenuInflater().inflate(R.menu.main, menu);  
33.         return true;  
34.     }  
35.   
36. }  

public class MainActivity extends Activity {private SharedPreferences putPreferences;private Editor putEditor;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 将服务器信息写入serverInfo.xmlfindViewById(R.id.buttonPut).setOnClickListener( new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubputPreferences = getSharedPreferences("serverInfo", Context.MODE_WORLD_READABLE);putEditor = putPreferences.edit();putEditor.putString("serverIP", "192.168.1.102");putEditor.putString("password", "123456");putEditor.commit();Toast.makeText(MainActivity.this,"服务器信息成功写入serverInfo.xml", Toast.LENGTH_LONG).show();}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

2、获取数据APP

[java] view plain copy

print?

1. public class MainActivity extends Activity {  
2.   
3.     private SharedPreferences getPreferences;  
4.       
5.     @Override  
6.     protected void onCreate(Bundle savedInstanceState) {  
7.         super.onCreate(savedInstanceState);  
8.         setContentView(R.layout.activity_main);  
9.           
10.         //从serverInfo.xml获取服务器信息  
11.         findViewById(R.id.buttonGet).setOnClickListener(new View.OnClickListener() {  
12.               
13.             @Override  
14.             public void onClick(View v) {  
15.                 // TODO Auto-generated method stub  
16.                 try {  
17.                     Context context=createPackageContext("com.example.putprefapp", Context.CONTEXT_IGNORE_SECURITY);  
18.                     getPreferences=context.getSharedPreferences("serverInfo", MODE_WORLD_READABLE);  
19.                     String serverIP=getPreferences.getString("serverIP","");  
20.                     String serverPwd=getPreferences.getString("password", "");  
21.                     Toast.makeText(MainActivity.this, "服务器信息如下：IP地址：" +serverIP+"; 密码："+serverPwd, Toast.LENGTH_LONG).show();  
22.                 } catch (NameNotFoundException e) {  
23.                     // TODO Auto-generated catch block  
24.                     e.printStackTrace();  
25.                 }  
26.             }  
27.         });  
28.           
29.     }  
30.   
31.     @Override  
32.     public boolean onCreateOptionsMenu(Menu menu) {  
33.         // Inflate the menu; this adds items to the action bar if it is present.  
34.         getMenuInflater().inflate(R.menu.main, menu);  
35.         return true;  
36.     }  
37.   
38. }  

public class MainActivity extends Activity {private SharedPreferences getPreferences;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//从serverInfo.xml获取服务器信息findViewById(R.id.buttonGet).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtry {Context context=createPackageContext("com.example.putprefapp", Context.CONTEXT_IGNORE_SECURITY);getPreferences=context.getSharedPreferences("serverInfo", MODE_WORLD_READABLE);String serverIP=getPreferences.getString("serverIP","");String serverPwd=getPreferences.getString("password", "");Toast.makeText(MainActivity.this, "服务器信息如下：IP地址：" +serverIP+"; 密码："+serverPwd, Toast.LENGTH_LONG).show();} catch (NameNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

3、关于android:sharedUserId

        上面的两个工程中并没有对Android:sharedUserId属性进行设置。这个属性是在查资料时看到的：意思是说，在manifest.xml里面将两个应用程序的android:sharedUserId属性设为相同的就可以对SharedPreferences文件进行写。（此处并没有验证）