Activity間互相傳值

1.page_1

 public void toPage2(View v){

 Intent intent = new Intent(this,page_2.class);//設定傳送參數

 Bundle bundle = new Bundle();

 bundle.putString("key1", "value1");

intent.putExtras(bundle); //將參數放入

intent startActivityForResult(intent, 0); //呼叫page2並要求回傳值

}

 2.page_2接收參數

 Intent intent = this.getIntent();

 Bundle bundle = intent.getExtras();//取得Bundle

 TextView txt_1 = (TextView)findViewById(R.id.txt1); 

 txt_1.setText(bundle.getString("name1")); //輸出Bundle內容

 3.若要回傳值

     bundle.putString("key2", "value2");

     intent.putExtras(bundle); //將key2放入Bundle

     page_2.this.setResult(Activity.RESULT_OK, intent); //回傳RESULT_OK

     page_2.this.finish(); //關閉Activity

 4.回到page_1增加onActivityResult

 @Override

      protected void onActivityResult(int requestCode, int resultCode, Intent data) {

  super.onActivityResult(requestCode, resultCode, data);         

 if (requestCode == 0 && resultCode == Activity.RESULT_OK) {

      Bundle bundle = data.getExtras();

      TextView txt_2 = (TextView)findViewById(R.id.txt2); 

      txt_2.setText(bundle.getString("key2"));

  }}