Android将app的崩溃日志写入到文件中

获取App的崩溃信息

将以下代码放到Application的onCreate()中

private void logMessage{

    //记录崩溃信息

    final Thread.UncaughtExceptionHandler defaultHandler = Thread.getDefaultUncaughtExceptionHandler();
    Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
        @Override
        public void uncaughtException(Thread thread, Throwable throwable) {
            //获取崩溃时的UNIX时间戳
            long timeMillis = System.currentTimeMillis();

            //将时间戳转换成人类能看懂的格式，建立一个String拼接器
            StringBuilder stringBuilder =new StringBuilder(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(new Date(timeMillis)));
            stringBuilder.append(":\n");

            //获取错误信息
            stringBuilder.append(throwable.getMessage());
            stringBuilder.append("\n");

            //获取堆栈信息
            StringWriter sw =new StringWriter();
            PrintWriter pw =new PrintWriter(sw);
            throwable.printStackTrace(pw);
            stringBuilder.append(sw.toString());

            //这就是完整的错误信息，保存到本地
            String errorLog = stringBuilder.toString();
            //将错误信息写入到文件中
            FileUtils.setAppendFile(errorLog);

            //最后处理这个崩溃，这里使用默认的处理方式让APP停止运行
            defaultHandler.uncaughtException(thread, throwable);
        }
    });
}

写入到文件的工具类

import android.os.Environment;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;

public class FileUtils {
    private static final String appName = "yourAppName";
    private static File file;

    static {
        file = new File(Environment.getExternalStorageDirectory(), appName);
        if (!file.exists()) {
            file.mkdirs();
        }
        file = new File(file, "log.txt");
    }

    /**
     * 将文本追加写入到文件
     */
    public static void setAppendFile(String value) {
        FileWriter fw;
        BufferedWriter bw;
        PrintWriter printWriter = null;
        try {
            fw = new FileWriter(file, true);
            bw = new BufferedWriter(fw);
            printWriter = new PrintWriter(bw);
            printWriter.println(value);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (printWriter != null) {
                printWriter.close();
            }
        }
    }
}

参考链接，感谢这位大佬的分享https://www.jianshu.com/p/644078912cfd