Android：如何知道在“onActivityResult”方法中点击了哪个按钮

Question

我有两个按钮，它们都进行条形码扫描。一旦它从扫描中返回，我想知道用户点击了哪个按钮，这样我就可以在“onActivityResult”方法上采用不同的路径。我怎么做？

我可以找出在 onClick() 方法中单击了哪个按钮，但这无济于事。

public class ReaderActivity extends AppCompatActivity {
    private Button scan_btn, verifyButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reader);
        scan_btn = (Button) findViewById(R.id.scan_btn);
        verifyButton = (Button) findViewById(R.id.buttonVerify);
        final Activity activity = this;
        scan_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                IntentIntegrator integrator = new IntentIntegrator(activity);
                integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                integrator.setPrompt("Scan");
                integrator.setCameraId(0);
                integrator.setBeepEnabled(false);
                integrator.setBarcodeImageEnabled(false);
                integrator.initiateScan();
            }
        });

        verifyButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                IntentIntegrator integrator = new IntentIntegrator(activity);
                integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                integrator.setPrompt("LINE UP BARCODE WITH SCANNER");
                integrator.setCameraId(0);
                integrator.setBeepEnabled(false);
                integrator.setBarcodeImageEnabled(false);
                integrator.initiateScan();

            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if(result != null){
            if(result.getContents()==null){
                Toast.makeText(this, "You cancelled the scanning", Toast.LENGTH_LONG).show();
            }
            else {
                Toast.makeText(this, result.getContents(),Toast.LENGTH_LONG).show();

            }
        }
        else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

Answer 1

您可以在活动中添加布尔值

例如：

private boolean isScanButtonClicked;

使用下面的代码

 scan_btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    isScanButtonClicked = true; // true a scan button clicked
                    IntentIntegrator integrator = new IntentIntegrator(activity);
                    integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                    integrator.setPrompt("Scan");
                    integrator.setCameraId(0);
                    integrator.setBeepEnabled(false);
                    integrator.setBarcodeImageEnabled(false);
                    integrator.initiateScan();
                }
            });


    verifyButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    isScanButtonClicked = false; // false as scan button not clicked
                    IntentIntegrator integrator = new IntentIntegrator(activity);
                    integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                    integrator.setPrompt("LINE UP BARCODE WITH SCANNER");
                    integrator.setCameraId(0);
                    integrator.setBeepEnabled(false);
                    integrator.setBarcodeImageEnabled(false);
                    integrator.initiateScan();

                }

根据 isScanButtonClicked 值，您可以在 onActivityResult() 中执行您的操作

希望这些对你有所帮助。

Answer 2

您可以添加一些标志/数据到 Intent 数据 返回并将这些数据处理为 onActivityResult 以在您的操作中点击按钮，或更改 的值>resultCode 以正确的方式处理此结果。

Answer 3

通过get set方法解决

创建了一个如下所示的类

public class myApplication extends Application{

    private String someVariable;

    public String getWhichButton() {
        return someVariable;
    }

    public void setWhichButton(String someVariable) {
        this.someVariable = someVariable;
    }
}

确保在 AndroidManifest 的 <Application> 标记中添加 android:name=".myApplication"。然后在我的 ReaderActivity 在按钮点击动作期间，我设置了

((myApplication) activity.getApplication()).setWhichButton("scan");

或

((myApplication) activity.getApplication()).setWhichButton("Verify");

取决于我点击的按钮。在我使用的 onActivityResult 方法上

((myApplication) this.getApplication()).getWhichButton();

检索单击了哪个按钮以采取相应的操作。

public class ReaderActivity extends AppCompatActivity{

    private Button scan_btn, verifyButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reader);
        scan_btn = (Button) findViewById(R.id.scan_btn);
        verifyButton = (Button) findViewById(R.id.buttonVerify);
        final Activity activity = this;
        scan_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((myApplication) activity.getApplication()).setWhichButton("scan");

                IntentIntegrator integrator = new IntentIntegrator(activity);
                integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                integrator.setPrompt("Scan");
                integrator.setCameraId(0);
                integrator.setBeepEnabled(true);
                integrator.setBarcodeImageEnabled(false);
                integrator.initiateScan();

            }
        });

        verifyButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((myApplication) activity.getApplication()).setWhichButton("verify");
                IntentIntegrator integrator = new IntentIntegrator(activity);
                integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
                integrator.setPrompt("LINE UP BARCODE WITH SCANNER");
                integrator.setCameraId(0);
                integrator.setBeepEnabled(true);
                integrator.setBarcodeImageEnabled(false);
                integrator.initiateScan();

            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);


        if(result != null){
            if(result.getContents()==null){
                Toast.makeText(this, "You cancelled the scanning", Toast.LENGTH_LONG).show();
            }
            else {
                Toast.makeText(this, result.getContents(),Toast.LENGTH_LONG).show();

                String val = ((myApplication) this.getApplication()).getWhichButton();
                if(val=="scan") {
                    Toast.makeText(this, "Scan button pressed", Toast.LENGTH_LONG).show();
                }
                else
                    Toast.makeText(this, "Verify button pressed", Toast.LENGTH_LONG).show();
            }
        }
        else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

Answer 4

public class MainActivity extends AppCompatActivity {

    public Button btnOne;
    public Button btnTwo;
    public String btnClicked;

    public static int VALUEONE = 1;
    public static int VALUETWO = 2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnUm = (Button)findViewById(R.id.btnUm);
        btnDois = (Button)findViewById(R.id.btnDois);

        btnOne.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Intent test = new Intent(MainActivity.this, NextActivity.class);
                btnClicked = "btnOne";
                startActivityForResult(test,VALUEONE);
            }
        });

       btnTwo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Intent test = new Intent(MainActivity.this, NextActivity.class);
                btnClicked = "btnTwo";
                startActivityForResult(test,VALUETWO);
            }
        });
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       System.out.println("Btn clicked: " + btnClicked);
  }

...........

我在我的 Android Studio 中尝试了这段代码，它可以工作。你做了类似的东西？