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標(biāo)題: startActivityForResult [打印本頁]

作者: 51黑fan 時間: 2016-1-31 02:37
標(biāo)題: startActivityForResult

tartActivityForResult ：

由Activity1啟動Activity2->執(zhí)行Activity2->在Activity2中調(diào)用setResult和finish方法數(shù)據(jù)將返回Activity1并觸發(fā)onActivityResult函數(shù)；

實(shí)例：

step1：在Activity1中定義全局標(biāo)志量

private static final int REQUEST_CONNECT_DEVICE = 1;

step2：在Activity1中的按鈕事件觸發(fā)startActivityForResult

Intent serverIntent = new Intent(Activity1.this,Activity.class);
startActivityForResult(serverIntent,REQUEST_CONNECT_DEVICE);

step3：在 Activity2中定義變量名字用于數(shù)據(jù)回傳到Activity1

public static String EXTRA_DEVICE_ADDRESS = "device_address";

step4:在Activity2中觸發(fā)setResut函數(shù)并調(diào)用finish方法傳回?cái)?shù)據(jù)

      Intent intent = new Intent();
intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

// Set result and finish this Activity
setResult(Activity.RESULT_OK, intent);//其中Activity.RESULT_OK是一個標(biāo)志，用于咋下一步在Activity1的接收中區(qū)分是那個setResult發(fā)送的數(shù)據(jù)
Toast.makeText(SearchDevice.this,info , 1).show();
finish();//調(diào)用finfish方法返回AActivity

step5：完成step4之后會自動進(jìn)入Activity1中的nActivityResult函數(shù)：

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

   switch (requestCode) {
        case REQUEST_CONNECT_DEVICE:
            // When DeviceListActivity returns with a device to connect
         if (resultCode == Activity.RESULT_OK) {
            // Get the device MAC address
              address = data.getExtras().getString(Activity2.EXTRA_DEVICE_ADDRESS);
}
}
}

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