RESULT_OK 无法解析为变量

Question

我的这条线有问题，我正在尝试使用处理创建一个适用于 android 的应用程序，我是 android 新手。 这是我的代码：

    @Override
    public void onActivityResult(int requestCode, int resultCode,Intent data){
    if(requestCode==0){

    if(resultCode == RESULT_OK){
    BACKGND=2; //Set the background to GREEN
    } else {
    BACKGND=1; //Set the background to RED
    }
    }
    }

我收到以下错误：

1. ERROR in /tmp/android6837327122296929778sketch/src/processing/test/sketch_151209a/sketch_151209a.java (at line 52)
if(resultCode == RESULT_OK){
                 ^^^^^^^^^
RESULT_OK cannot be resolved to a variable

//////更新////////

完整代码如下：

import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
int BACKGND=0; //Set the background to BLUE

//Get the default Bluetooth adapter
BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();


/*The startActivityForResult() launches an Activity which is
used to request the user to turn Bluetooth on. 
 The following onActivityResult() method is called when the 
 Activity exits. */
@Override
public void onActivityResult(int requestCode, int resultCode, Intent   data){
 if(requestCode==0){

 if(resultCode == Activity.RESULT_OK){
 BACKGND=2; //Set the background to GREEN
 } else {
 BACKGND=1; //Set the background to RED
 }
 }
}

void setup(){
 orientation(LANDSCAPE);

 /*IF Bluetooth is NOT enabled, 
 then ask user permission to enable it */
 if (!bluetooth.isEnabled()) {
 Intent requestBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
 startActivityForResult(requestBluetooth, 0);
 }
}

void draw(){
 if(BACKGND==0){
 background(10,10,255); //Set background to BLUE
 } else if(BACKGND==1) {
 background(255,10,10); //Set background to RED
 } else {
 background(10,255,10); //Set background to GREEN
 }
}

Answer 1

RESULT_OK 是 Activity 类的常量。如果此代码在 Fragment 中执行，则不会解析变量。

参考如下：

Activity.RESULT_OK