[Android智慧型手機設計_由其他活動回傳資料以Intent6_3為例]

woff

/*

1.想要由被啟動的Activity取得回傳資料，那麼啟用端必須改用startActivityForResult ()方法來啟動Activity

2.被啟動的Activity端要回傳資料時，亦是使用putExtra ()方法設定name-value pair，之後再使用setResult()方法回傳資料

3.啟用端Activity必須實作onActivityResult ()方法來處理被啟動之A

ctivity所回傳的資料
*/
1.來源_First.java
/*
//1.建立Intent物件
Intent myIntent = new Intent();
//2.藉由setClass()方法設定來源與目的地類別
myIntent.setClass(First.this, Second.class);
//3.建立Bundle物件，利用putString(鍵值,資料)方法新增字串資料
Bundle bundle = new Bundle();
bundle.putString("HEIGHT", height.getText().toString());
bundle.putString("WEIGHT“, weight.getText().toString());
//4.使用Intenet物件的puExtras()方法，附加Bundle物件
myIntent.putExtras(bundle);
//6.啟動活動
startActivity(myIntent);
*/

1. package com.example.inten6_3;
   
2. 
   
3. import android.os.Bundle;
   
4. import android.app.Activity;
   
5. import android.content.Intent;
   
6. import android.view.Menu;
   
7. import android.view.View;
   
8. import android.view.View.OnClickListener;
   
9. import android.widget.Button;
   
10. import android.widget.EditText;
    
11. import android.widget.TextView;
    
12. 
    
13. public class First extends Activity {
    
14. EditText et1,et2,et3;
    
15. Button btn1;
    
16. static final int SET_SECOND=1;
    
17. @Override
    
18. protected void onCreate(Bundle savedInstanceState) {
    
19. super.onCreate(savedInstanceState);
    
20. setContentView(R.layout.first);
    
21. et1=(EditText)findViewById(R.id.editText1);
    
22. et2=(EditText)findViewById(R.id.editText2);
    
23. et3=(EditText)findViewById(R.id.editText3);
    
24. btn1=(Button)findViewById(R.id.button1);
    
25. btn1.setOnClickListener(new OnClickListener(){
    
26. 
    
27. @Override
    
28. public void onClick(View v) {
    
29. Intent i=new Intent();
    
30. i.setClass(First.this, Second.class);
    
31. Bundle b1=new Bundle();
    
32. b1.putString("1", et1.getText().toString());
    
33. b1.putString("2", et2.getText().toString());
    
34. b1.putString("3", et3.getText().toString());
    
35. i.putExtras(b1);
    
36. startActivityForResult(i,SET_SECOND);
    
37. }});
    
38. }
    
39. protected void onActivityResult (int requestCode, int resultCode, Intent data){
    
40. super.onActivityResult(requestCode, resultCode, data);
    
41. switch(requestCode)
    
42. {
    
43. case SET_SECOND:
    
44. if(resultCode==RESULT_OK){
    
45. Bundle b=data.getExtras();
    
46. String s=b.getString("sum");
    
47. TextView op=(TextView)findViewById(R.id.op);
    
48. op.setText(s);
    
49. }
    
50. }
    
51. }
    
52. }

複製代碼

2.目的地_Second.java
/*在目標活動可以呼叫Activity物件的getIntent()方法取得Intent物件，
然後呼叫Intent物件的getExtras()方法取得攜帶的Bundle物件*/

package com.example.inten6_3;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Second extends Activity {
Button btn2;
String result;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
double n1,n2,n3,sum,avg;
Bundle b2=this.getIntent().getExtras();
if(b2!=null){
n1=Double.parseDouble(b2.getString("1"));
n2=Double.parseDouble(b2.getString("2"));
n3=Double.parseDouble(b2.getString("3"));
sum=n1+n2+n3;
avg=sum/3;
TextView output=(TextView)findViewById(R.id.output);
output.setText(getString(R.string.s1)+n1+getString(R.string.s2)+n2+getString(R.string.s3)+n3
+"\n"+getString(R.string.s4)+sum+getString(R.string.s5)+avg);
result=output.getText().toString();
}
btn2=(Button)findViewById(R.id.button2);
btn2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Intent reply=new Intent();
Bundle c=new Bundle();
c.putString("sum",result);
reply.putExtras(c);
setResult(RESULT_OK, reply);
finish();
}});
}
}

IntentBundle_return.zip (1.32 MB, 下載次數: 996)

2013-6-14 19:08 上傳

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