Activity接收Activity回傳的值 @ 自由手記

如果一個Activity開啟新的必且等待他要回傳的值那寫法如下

M0101要呼叫M0102並等待他回傳值要使用startActivityForResult並且宣告onActivityResult來處理Activity返回時所帶的參數

startActivityForResult(intent, 給Activity一個編號型態為int);

當值回傳再以requestCode來判斷．

呼叫M0102的寫法

Intent intent = new Intent(M0101.this, M0102.class);
   // intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
   // startActivity(intent);
    startActivityForResult(intent, m0102);

M0101內地onActivityResult方法

@Override //接startActivityForResult() request 的return值
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        int get_resultCode = resultCode;
        switch(requestCode){
         case requestCode01 :
          if(data != null){
           try{
                String A = data.getExtras().getString("A");
               String B = data.getExtras().getString("B");
               String C = data.getExtras().getString("C");
               Log.e("gggg", A + "  .  " + B + "  .  "+ C +"  .  ");
               v_m0101t001.setText(A);
               v_m0101t002.setText(B);
               v_m0101t003.setText(C);
           
               s_height = A;
               s_weight = B;
               s_japanSize = C;
              }catch (NullPointerException e){ }
          }
          break;
         case requestCode02 :
          if(data != null){
           try{
                String A = data.getExtras().getString("A");
               String B = data.getExtras().getString("B");
               String C = data.getExtras().getString("C");
               Log.e("gggg", A + "  .  " + B + "  .  "+ C +"  .  ");
               v_m0101t004.setText(A);
               v_m0101t005.setText(B);
               v_m0101t006.setText(C);
           
           
             
               s_long = A;
               s_wide = B;
               s_round = C;
              }catch (NullPointerException e){ }
         }
         break;    
         case m0102 :
          if(data != null){
           try{
                String A = data.getExtras().getString("size");
               v_m0101t004.setText(A);
               s_long = A;
           
              }catch (NullPointerException e){ }
         }
        }
 }

M0102結束回傳時的寫法

 Intent intent = new Intent();
          Bundle bundle=new Bundle();
          bundle.putString("size", japsize+""  );
          intent.putExtras(bundle);
      setResult(RESULT_OK,intent);
      finish();