Android闪退日志保存到本地

package com.pn.cal;

import android.content.Context;
import android.os.Build;
import android.os.Environment;
import android.util.Log;
 
import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.text.SimpleDateFormat;
import java.util.Date;
 
public class CrashHandler implements UncaughtExceptionHandler {

    private static final String TAG = "CrashHandler";

    private static final String CRASH_DIR = "crashes";
    private static final String CRASH_LOG_PATH = "crash_log.txt";

    private Thread.UncaughtExceptionHandler defaultUEH;

    private Context context;

    private CrashHandler() {
        this.defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
    }

    private static CrashHandler instance;

    public static CrashHandler getInstance() {
        if (instance == null) {
            instance = new CrashHandler();
        }
        return instance;
    }

    public void init(Context context) {
        this.context = context;
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        if (e == null) {
            if (defaultUEH != null) {
                defaultUEH.uncaughtException(t, e);
            }
            return;
        }

        // 收集异常信息
        String exceptionInfo = collectExceptionInfo(e);
        String deviceInfo = collectDeviceInfo();

        saveCrashInfoToFile(deviceInfo, exceptionInfo);

        // 如果系统提供了默认的未捕获异常处理，则交给系统去处理
        if (defaultUEH != null) {
            defaultUEH.uncaughtException(t, e);
        }
    }

    private String collectDeviceInfo() {
        StringBuilder deviceInfo = new StringBuilder();
        // 可以添加更多设备信息
        deviceInfo.append("Brand: ").append(Build.BRAND).append("\n");
        deviceInfo.append("Model: ").append(Build.MODEL).append("\n");
        deviceInfo.append("Android Version: ").append(Build.VERSION.RELEASE).append("\n");
        return deviceInfo.toString();
    }

    private String collectExceptionInfo(Throwable e) {
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        e.printStackTrace(printWriter);
        Throwable cause = e.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String exceptionInfo = writer.toString();

        Log.e("xxx",exceptionInfo);
        return exceptionInfo;
    }

    private void saveCrashInfoToFile(String deviceInfo, String exceptionInfo) {

        File dir =  context.getExternalFilesDir(CRASH_DIR);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        File file = new File(dir, CRASH_LOG_PATH);
        try {
            PrintWriter printWriter = new PrintWriter(file);
            printWriter.println(deviceInfo);
            printWriter.println(exceptionInfo);
            printWriter.close();
        } catch (Exception e) {
            Log.e(TAG, "An error occurred while writing crash info to file");
        }
    }
}