안드로이드 다른 액티비티 함수 가져오기 질문

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private final View.OnClickListener searchListener &#61; new View.OnClickListener() { &#64;Override public void onClick(View v) { int id &#61; v.getId(); if (id &#61;&#61; R.id.layout_0_btn_scan) { // scan ((QRScanActivity)QRScanActivity.mContext).startScan(); } };package com.kogas.mmmb.activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import com.google.zxing.integration.android.IntentIntegrator; import com.google.zxing.integration.android.IntentResult; import com.kogas.mmmb.R; public class QRScanActivity extends AppCompatActivity { public static Context mContext; private String scanData &#61; &#34;&#34;; &#64;Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); mContext &#61; this; } public void startScan(){ new IntentIntegrator(QRScanActivity.this).initiateScan(); } public String reScanData(){ if(scanData !&#61; &#34;&#34;){ return scanData; } else { return null; } } &#64;Override protected void onActivityResult(int requestCode, int resultCode, Intent data){ IntentResult result &#61; IntentIntegrator.parseActivityResult(requestCode, resultCode, data); if(result !&#61; null){ if(result.getContents() &#61;&#61; null){ Toast.makeText(QRScanActivity.this, &#34;Cancelled&#34;, Toast.LENGTH_SHORT).show(); } else { Toast.makeText(QRScanActivity.this, &#34;Success&#34;, Toast.LENGTH_SHORT).show(); scanData &#61; result.getContents().toString(); } } else { super.onActivityResult(requestCode, resultCode, data); } } } ((QRScanActivity)QRScanActivity.mContext).startScan()으로 QRScanActivity의 다른 액티비티 상에서 startScan함수를 실행시키려 하는데 QRScanActivity.mContext이 계속 null값이라고 뜹니다. 어떻게 해결할 수 있을까요?

안드로이드 다른 액티비티 함수 가져오기 질문

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