应用程序每次从活动移动时都会崩溃，没有错误

Question

我目前正在开发一个我正在开发的应用程序无法调试的问题。我在SDK 27，Graddle 3.0.1上，使用ZXing 1.9.8。

在一个Activity中，我调用了一个我用ZXing库创建的QR Reader类，所以它读取代码并通过Bundle将它发送到另一个Activity来分析它。

正在发生的事情是它打开相机，读取代码，然后应用程序关闭，无处不在，甚至无法打开下一个活动。 当用户选择在我做的一个小输入对话框上手动插入代码时，它现在到达下一个活动，但它太简单了，因为它没有在那里的任何断点处停止所以我可以调试它。

我通过在调用 bundle.putExtra 和 startactivity（） 这对我来说可以理解为黑魔法。

由于没有错误，我开始查看logcat并重复发现：

01-29 15:28:32.706 701-765/system_process I/ActivityManager: Displayed com.psa.dkd/.activities.GetCarDetails: +90ms
01-29 15:28:32.858 701-1562/system_process I/WindowManager: WIN DEATH: Window{f7887c u0 com.psa.dkd/com.psa.dkd.activities.GetCarDetails}
01-29 15:28:32.862 701-889/system_process W/ActivityManager: Force removing ActivityRecord{7d4750 u0 com.psa.dkd/.activities.GetCarDetails t165}: app died, no saved state
01-29 15:28:32.869 701-1530/system_process I/WindowManager: WIN DEATH: Window{6bb4c7f u0 com.psa.dkd/com.psa.dkd.activities.ReaderQR EXITING}
01-29 15:28:32.871 701-1486/system_process I/WindowManager: WIN DEATH: Window{11094d u0 SurfaceView - com.psa.dkd/com.psa.dkd.activities.ReaderQR EXITING}
01-29 15:28:32.875 701-1528/system_process I/WindowManager: WIN DEATH: Window{a96ce5a u0 com.psa.dkd/com.psa.dkd.activities.ReadChassisActivity}

从我收集到的内容中，当主线程执行的工作量太大时，就会发生WIN DEATH，但这在过去是完美的。此外，主线程中没有那么多工作，因为我尽可能使用线程。

这可能是导致此更新的更新吗？我输了。

修改

ReadChassisActivity：https://pastebin.com/r60SPPHF

ReaderQR：https://pastebin.com/PSPT29Da

GetCarDetails：https://pastebin.com/Sgbi1XDi

ReadChassisActivity

import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;

import com.psa.dkd.R;
import com.psa.dkd.utils.Logger;
import com.psa.dkd.utils.SessionManagement;

import java.util.concurrent.TimeUnit;

public class ReadChassisActivity extends AppCompatActivity {

    private int BARCODE_READER_REQUEST_CODE;
    SessionManagement session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_read_chassis);
        session = new SessionManagement(getApplicationContext());

        setTitle("Welcome" + session.getUserDetails().get("name"));

        RelativeLayout new_car_manual = (RelativeLayout) findViewById(R.id.new_car_manual);
        new_car_manual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View view) {
                LayoutInflater li = LayoutInflater.from(ReadChassisActivity.this);
                View promptsView = li.inflate(R.layout.input_prompt, null);
                final EditText input = promptsView.findViewById(R.id.editTextDialogUserInput);
                input.requestFocus();

                AlertDialog alertDialog = new AlertDialog.Builder(ReadChassisActivity.this, R.style.DialogTheme).create();
                alertDialog.setTitle("Manual Input");
                alertDialog.setMessage("Insert barcode");
                alertDialog.setView(promptsView);
                alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {
                        String result = input.getText().toString().toUpperCase();
                        Logger.writeToLog(result, 0, 9);
                        Logger.writeLogToDB(session, 0, result, 9, 0);
                        Intent workIntent = new Intent(ReadChassisActivity.this, GetCarDetails.class);
                        Bundle b = new Bundle();
                        b.putString("car_code", result);
                        workIntent.putExtras(b);
                        /*try {
                            TimeUnit.SECONDS.sleep(1);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }*/
                        startActivity(workIntent);
                        finish();
                    }
                });
                alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                alertDialog.show();
            }
        });

        RelativeLayout new_car = (RelativeLayout) findViewById(R.id.new_car);
        new_car.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(ReadChassisActivity.this, "Connecting camera...", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(ReadChassisActivity.this, ReaderQR.class);
                startActivityForResult(intent, BARCODE_READER_REQUEST_CODE);
            }
        });

        RelativeLayout exit = (RelativeLayout) findViewById(R.id.exit);
        exit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog alertDialog = new AlertDialog.Builder(ReadChassisActivity.this, R.style.DialogTheme).create();
                alertDialog.setTitle("Exit");
                alertDialog.setMessage("Return to login");
                alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        finishAffinity();
                        finish();
                        //session.logoutUser();
                        Intent i = new Intent(ReadChassisActivity.this, LoginActivity.class);
                        startActivity(i);
                    }
                });
                alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                alertDialog.show();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == BARCODE_READER_REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                String result = data.getStringExtra("code");
                Logger.writeToLog(result, 0, 9);
                Logger.writeLogToDB(session, 0, result, 9, 0);

                Intent workIntent = new Intent(ReadChassisActivity.this, GetCarDetails.class);
                Bundle b = new Bundle();
                b.putString("car_code", result);
                workIntent.putExtras(b);
                /*try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }*/
                startActivity(workIntent);
                finish();
            }
            if (resultCode == Activity.RESULT_CANCELED) {
                //Write your code if there's no result
                Toast.makeText(getApplicationContext(), "No results", Toast.LENGTH_LONG).show();
                Intent choiceIntent = new Intent(ReadChassisActivity.this, ReadChassisActivity.class);
                startActivity(choiceIntent);
                finish();
            }
        }
    }

    @Override
    public void onBackPressed() {

    }
}

ReaderQR

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import com.google.zxing.Result;
import com.psa.dkd.R;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class ReaderQR extends AppCompatActivity implements ZXingScannerView.ResultHandler {

    private ZXingScannerView mScannerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reader_qr);
        QrScanner(this.mScannerView);
        setTitle("Pass it over the code!");
    }

    public void QrScanner(View view) {
        mScannerView = new ZXingScannerView(this);
        setContentView(mScannerView);
        mScannerView.setResultHandler(this);
        mScannerView.startCamera();
    }

    @Override
    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();
    }

    public void handleResult(Result rawResult) {
        Intent returnIntent = new Intent();
        returnIntent.putExtra("code", rawResult.getText());
        setResult(Activity.RESULT_OK, returnIntent);
        finish();
    }
}

GetCarDetails

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.psa.dkd.R;
import com.psa.dkd.utils.SessionManagement;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.concurrent.ExecutionException;

import static com.psa.dkd.utils.Misc.jsonToMap;

public class GetCarDetails extends Activity {

    private final int WAIT_TIME = 1000;
    private String car_code;
    private String server;
    private String worker_id;
    private HashMap<String, String> car_data;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_get_details);
        findViewById(R.id.mainSpinner2).setVisibility(View.VISIBLE);
        SessionManagement session = new SessionManagement(GetCarDetails.this);
        this.server = session.getUserDetails().get("server");
        this.worker_id = session.getUserDetails().get("id");
        this.car_code = getIntent().getExtras().getString("car_code");

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                // GET CAR DETAILS FROM DB - car_code

                try {
                        Log.d("TEST", "TRYING...");
                    String result = new getCarData().execute("APP/getCarDetails.php", car_code, worker_id).get();
                    Log.d("TEST", "RECEIVED: " + result);
                    car_data = jsonToMap(result);
                } catch (InterruptedException | ExecutionException | JSON    Exception e) {
                    Log.d("TESTE", e.toString());
                    Toast.makeText(getApplicationContext(), "Error has happened", Toast.LENGTH_LONG).show();
                    Intent choiceIntent = new Intent(GetCarDetails.this, ReadChassisActivity.class);
                    startActivity(choiceIntent);
                    finish();
                }

                if (car_data.get("result").equals("1")) {
                    Bundle b = new Bundle();
                    b.putString("car_code", car_code);
                    (...)
                    Intent i = new Intent(GetCarDetails.this, JobSelectActivity.class);
                    i.putExtras(b);
                    startActivity(i);
                    finish();
                } else {
                    if (car_data.get("result").equals("0")) {
                        Toast.makeText(GetCarDetails.this, "Nothing scheduled", Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(GetCarDetails.this, "This one is done, take another", Toast.LENGTH_LONG).show();
                    }
                    Intent mainIntent = new Intent(GetCarDetails.this, ReadChassisActivity.class);
                    startActivity(mainIntent);
                    finish();
                }
            }
        }, WAIT_TIME);
    }

    public class getCarData extends AsyncTask<String, String, String> {

        @Override
        protected String doInBackground(String... params) {

            String text = "";
            BufferedReader reader = null;

            try {
                URL url = new URL(server + params[0]);
                JSONObject postDataParams = new JSONObject();
                postDataParams.put("code", params[1]);
                postDataParams.put("user_id", params[1]);

                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setReadTimeout(15000); // milliseconds
                conn.setConnectTimeout(15000); // milliseconds
                conn.setRequestMethod("POST");
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setRequestProperty("json", postDataParams.toString());

                DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
                String param = "json=" + URLEncoder.encode(postDataParams.toString(), "UTF-8");
                wr.write(param.getBytes());
                wr.flush();
                wr.close();
                // Get the server response
                reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                StringBuilder sb = new StringBuilder();
                String line = null;
                // Read Server Response
                while ((line = reader.readLine()) != null) {
                    // Append server response in string
                    sb.append(line).append("\n");
                }
                text = sb.toString();
                return text;
            } catch (Exception e) {
                Log.d("ERROR FETCHING DATA", "Exception: " + e.getMessage());
                return "Exception: " + e.getMessage();
            }
        }
    }
}

Answer 1

尝试删除Toast.makeText

最近3天内，我一直在搜索类似的错误。我也不例外，只有WINDEATH像你一样。

我希望这对某人有帮助。

Answer 2

收到相机结果后，您忘记恢复相机处理程序。您需要添加以下内容：

@Override
public void onResume() {
    super.onResume();
    mScannerView.setResultHandler(this);
    mScannerView.startCamera();
}

查看示例：https://github.com/dm77/barcodescanner/blob/master/zxing-sample/src/main/java/me/dm7/barcodescanner/zxing/sample/SimpleScannerActivity.java

Answer 3

所以，我一直尝试其他方法，我来到这里：

(...)
Intent workIntent = new Intent(ReadChassisActivity.this, GetCarDetails.class);
Bundle b = new Bundle();
b.putString("car_code", result);
workIntent.putExtras(b);
try {
        TimeUnit.MILLISECONDS.sleep(100);
} catch (InterruptedException e) {
        e.printStackTrace();
}
startActivity(workIntent);
finish();

似乎为putExtras（）方法提供时间来解决问题，对可用性影响最小。

这是为什么？此外，这看起来像用胶带把建筑物给我，是不是有更好的方法？