android學習筆記之-利用Intent在多個Activity之間跳轉

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在網上查了好多關於這方面的資料和教程，東西倒是不少，但大多都是過時的版本。於是乎自己研究了下android的api

寫了個小例子 ，廢話不多說，先上代碼.

先寫一個HelloWorld0作爲第一個Activity:

1. package android.gong.sample;
2. 
   
3. 
   
4. import android.app.Activity;
5. import android.content.Intent;
6. import android.net.Uri;
7. import android.os.Bundle;
8. import android.view.View;
9. import android.widget.Button;
10. import android.widget.TextView;
11. 
    
12. public class HelloWorld0 extends Activity{
13.     int REQUEST_CODE=2;
14.     @Override
15.     protected void onCreate(Bundle savedInstanceState) {
16.         super.onCreate(savedInstanceState);
17.         setContentView(R.layout.main0);
18.         setOneButton();
19.         
20.         
21.         
22.     }
23.     
24.     
25.     public void setOneButton()
26.     {
27.         Button btn1 =  (Button)findViewById(R.id.btn0);
28.         btn1.setOnClickListener(new View.OnClickListener(){
29. 
    
30.             
31.             public void onClick(View v) {
32.                 Intent intent=new Intent();
33.                 intent.setClass(HelloWorld0.this, HelloWorldActivity.class);//指定了跳轉前的Activity和跳轉後的Activity
34.                 intent.setData(Uri.parse("one"));//向下一個Activity傳遞了string類型參數"one"
35.                 startActivityForResult(intent, REQUEST_CODE);//以傳遞參數的方式跳轉到下一個Activity
36.             
37. //              startActivity(intent);//這種方式不能傳遞參數
38. //              finish();//如果不結束，那麼這個Activity將被壓在下一個Activity之下
39.             }
40.             
41.         });
42.     }
43.     
44.     
45.     
46.     
47.     /**由系統調用，捕獲下一個Activity的回傳參數*/
48.     @Override
49.     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
50.             if(requestCode==REQUEST_CODE)//請求碼
51.             {
52.                 if(resultCode==HelloWorldActivity.RESULT_OK)//返回碼
53.                 {
54.                     TextView tv = (TextView)findViewById(R.id.tv0);
55.                     tv.setText(data.getDataString());
56.                 }
57.             }
58.     }

然後寫一個HelloWorldActivity作爲第二個Activity,

1. package android.gong.sample;
2. 
   
3. import android.app.Activity;
4. import android.content.Intent;
5. import android.net.Uri;
6. import android.os.Bundle;
7. import android.util.Log;
8. import android.view.View;
9. import android.widget.Button;
10. import android.widget.TextView;
11. 
    
12. public class HelloWorldActivity extends Activity {
13.     /** Called when the activity is first created.
14.     @Override */
15.     static int  RESULT_OK=1;
16.     MyView myView;
17.     public static HelloWorldActivity activity;
18.     
19.     Intent intent;
20.     String result="";
21.     
22.     public HelloWorldActivity() {
23.         activity=this;
24.         
25.     }
26.     
27.     
28.     public void onCreate(Bundle savedInstanceState) {
29.         super.onCreate(savedInstanceState);
30.         setContentView(R.layout.main);
31.         
32.          intent=HelloWorldActivity.this.getIntent();
33.         String tmp=intent.getDataString();
34.         
35.         
36.          
37.          TextView tv = (TextView)findViewById(R.id.tv);
38.             tv.setText(tmp+"  /"one/"是由上一個Activity傳遞過來的," +
39.                     "當按下Exit按鈕的時候，該Activity會向上個Activity返回/"one and two/"作爲參數," +
40.                     "然後上一個Activity由系統調用onActivityResult(int requestCode, int resultCode, Intent data)" +
41.                     "來捕獲該參數" );
42.          
43.         if(tmp!=null)
44.         
45.             result =    tmp+" and two";
46.         else
47.         {
48.             result="intent can't work";
49.             Log.i("helloworld","intent can't work");
50.         }
51.             
52.         
53.         
54.         
55.         set_main1Button();
56.       
57.         
58.         
59.     }
60.     
61.     public void set_main1Button()
62.     {
63.           Button btn1=(Button)findViewById(R.id.go);
64.               btn1.setOnClickListener(new View.OnClickListener(){
65.                 public void onClick(View arg0) {
66.                     
67.                     activity.setContentView(R.layout.main2);
68.                     activity.set_main2Button();
69.                 
70.                 }
71.                   });
72.           Button btn2=(Button)findViewById(R.id.exit);
73.          
74.           btn2.setOnClickListener(new View.OnClickListener(){
75. 
    
76.             public void onClick(View v) {
77.             
78.                 intent.setData(Uri.parse(result));
79.                 HelloWorldActivity.this.setResult(RESULT_OK , intent);
80.                 
81.                 
82.                 activity.finish();
83.             
84.             }
85.               
86.           });
87.     }
88.     
89.     public void set_main2Button()
90.     {
91.             Button btn3=(Button)findViewById(R.id.back);
92.             btn3.setOnClickListener(new View.OnClickListener(){
93. 
    
94.                 public void onClick(View v) {
95.                     activity.setContentView(R.layout.main);
96.                     activity.set_main1Button();
97.                     
98.                 }
99.                 
100.             });
101.             
102.             Button btn4=(Button)findViewById(R.id.next);
103.             btn4.setOnClickListener(new View.OnClickListener(){
104. 
     
105.                 public void onClick(View v) {
106.                     MyView mv = new MyView(activity);
107.                     activity.setContentView(mv);
108.                     
109.                     
110.                 }
111.                 
112.             });
113.     }

這樣就可以實現

1.從HelloWorld0 帶着字符串參數"one"跳轉到 HelloWorldActivity,

2.HelloWorldActivity接收到參數"one"後處理成"one and two"返回給HelloWorld

以下是運行結果: