/*
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);
*/
- package com.example.inten6_3;
- import android.os.Bundle;
- import android.app.Activity;
- import android.content.Intent;
- import android.view.Menu;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- public class First extends Activity {
- EditText et1,et2,et3;
- Button btn1;
- static final int SET_SECOND=1;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.first);
- et1=(EditText)findViewById(R.id.editText1);
- et2=(EditText)findViewById(R.id.editText2);
- et3=(EditText)findViewById(R.id.editText3);
- btn1=(Button)findViewById(R.id.button1);
- btn1.setOnClickListener(new OnClickListener(){
- @Override
- public void onClick(View v) {
- Intent i=new Intent();
- i.setClass(First.this, Second.class);
- Bundle b1=new Bundle();
- b1.putString("1", et1.getText().toString());
- b1.putString("2", et2.getText().toString());
- b1.putString("3", et3.getText().toString());
- i.putExtras(b1);
- startActivityForResult(i,SET_SECOND);
- }});
- }
- protected void onActivityResult (int requestCode, int resultCode, Intent data){
- super.onActivityResult(requestCode, resultCode, data);
- switch(requestCode)
- {
- case SET_SECOND:
- if(resultCode==RESULT_OK){
- Bundle b=data.getExtras();
- String s=b.getString("sum");
- TextView op=(TextView)findViewById(R.id.op);
- op.setText(s);
- }
- }
- }
- }
復制代碼
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
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