android crash的log信息自动保存_getname().contains("crash")-优快云博客

本文介绍了一种在Android应用中自动保存未捕获异常信息至日志文件的方法，通过定制线程异常处理器实现，在发生未捕获异常后自动记录异常堆栈信息，并将日志保存到指定目录下，便于后续分析和问题定位。

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每次让测试人员抓log都比较麻烦，有的log还是一次性的，错过了抓log的机会就比较难以复现了。发生未捕获异常后自动保存log信息

package com.example.exceptioncatchtest;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.Thread.UncaughtExceptionHandler;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Application;
import android.os.Environment;
import android.util.Log;

public class AbstractApplication extends Application {

	private static String packageName;
	private static String TAG;

	public AbstractApplication() {

	}

	@Override
	public void onCreate() {
		super.onCreate();
		TAG = getClass().getSimpleName();
		packageName = getPackageName();
		Thread.setDefaultUncaughtExceptionHandler(new CrashHandler());

	}

	class CrashHandler implements UncaughtExceptionHandler {

		@Override
		public void uncaughtException(Thread thread, Throwable ex) {
			StringWriter stringWriter = new StringWriter();
			PrintWriter printWriter = new PrintWriter(stringWriter);
			ex.printStackTrace(printWriter);
			printWriter.close();
			saveLog(stringWriter.toString());
			android.os.Process.killProcess(android.os.Process.myPid());
		}

	}

	/**
	 * 保存异常信息到文件中 StorageDirectory+/DebugLogs/packageName + getTime() + ".txt"
	 * 
	 * @param exception
	 */
	private void saveLog(String exception) {

		File path = Environment.getExternalStorageDirectory();
		StringBuilder sb = new StringBuilder();
		sb.append(path.getAbsolutePath());
		sb.append("/DebugLogs/");
		File dirFile = new File(sb.toString());
		Log.d(packageName, "directory name: " + dirFile.getName());
		if (!dirFile.exists()) {
			dirFile.mkdirs();
		}

		deleteLogs(dirFile);

		File file = new File(dirFile, packageName + getTime("yyyy-MM-dd-hh-mm-ss") + ".txt");
		Log.d(packageName, "file name: " + file.getName());
		if (!file.exists()) {
			try {
				file.createNewFile();
				FileOutputStream out = new FileOutputStream(file);
				out.write(exception.getBytes());
				out.close();
			} catch (IOException e) {
				Log.e(packageName, "IOException" + e.getMessage());
			}
		}

	}

	/**
	 * 删除file目录下的非今天log，节省空间
	 * 
	 * @param file
	 */
	private void deleteLogs(File file) {
		String key = getTime("yyyy-MM-dd");
		File[] files = file.listFiles();
		for (File f : files) {
			if (!f.getName().contains(key)) {
				f.delete();
			}
		}

	}

	/**
	 * 根据输入格式返回时间数据
	 * 
	 * @param type
	 * @return
	 */
	private String getTime(String type) {
		SimpleDateFormat format = new SimpleDateFormat(type);
		return format.format(new Date());
	}

}