1  @Override
 2     protected void onCreate(Bundle savedInstanceState) {
 3         super.onCreate(savedInstanceState);
 4         setContentView(R.layout.activity_main);
 5
 6         /**  解码演示 */
 7
 8         //解码之前的字符串
 9         String str1= " %E6%88%91%E6%98%AFvhly%EF%BC%8C%E4%BD%A0%E6%98%AF%E8%B0%81%3F";
10         //解码之后的字符串
11         try {
12             String str2= URLDecoder.decode(str1,"UTF-8");
13             Log.v("TAG", "str2="+str2); //str2= 我是vhly，你是谁?
14
15         } catch (UnsupportedEncodingException e) {
16             // TODO Auto-generated catch block
17             e.printStackTrace();
18         }
19
20         /** 编码演示*/
21         String str3 = "It's Don!";
22         try {
23             String str4 = URLEncoder.encode(str3, "UTF-8");
24             Log.v("TAG", "str4="+str4); //str4=It%27s+Don%21
25
26         } catch (UnsupportedEncodingException e) {
27             // TODO Auto-generated catch block
28             e.printStackTrace();
29         }
30
31     }

 1 import java.net.URLDecoder;
 2 import java.net.URLEncoder;
 3
 4 import android.util.Base64;
 5 @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_main);
 9
10         /**  解码演示 */
11
12         //解码之前的字符串
13         String str1= "5L2g5piv6LCBPw==";
14         //解码之后的字符串
15         try {
16             byte[] bytes = Base64.decode(str1, Base64.NO_WRAP);
17             String str2= new String(bytes,"UTF-8");
18             Log.v("TAG", "str2="+str2); //str2=你是谁?
19
20
21         } catch (UnsupportedEncodingException e) {
22             e.printStackTrace();
23         }
24
25         /** 编码演示*/
26         String str3 = "I love Android!";
27         try {
28             String str4 = Base64.encodeToString(str3.getBytes("UTF-8"), Base64.NO_WRAP);
29             Log.v("TAG", "str4="+str4); // str4=SSBsb3ZlIEFuZHJvaWQh
30
31         } catch (UnsupportedEncodingException e) {
32             // TODO Auto-generated catch block
33             e.printStackTrace();
34         }
35
36     }