在android 项目调试的时候,经常会出现崩溃,一些异常等,测试测的时候没有办法记录错误日志,咱们在项目中写一个收集错误日志的类,方便了查看错误日志
package util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import com.v2application.V2Application;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;
/**
*收集logcat，保存到SD卡
*/
public class CrashHandler implements UncaughtExceptionHandler {
public static final String TAG = CrashHandler.class.getSimpleName();
// 系统默认的UncaughtException处理类
private Thread.UncaughtExceptionHandler mDefaultHandler;
// CrashHandler实例
private static CrashHandler INSTANCE = new CrashHandler();
// 程序的Context对象
private Context mContext;
// 用来存储设备信息和异常信息
private Map<String, String> infos = new HashMap<String, String>();
// 用于格式化日期,作为日志文件名的一部分
private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.getDefault());
/** 保证只有一个CrashHandler实例 */
private CrashHandler() {
}
/** 获取CrashHandler实例 ,单例模式 */
public static CrashHandler getInstance() {
return INSTANCE;
}
/**
* 初始化
*
* @param context
*/
public void init(Context context) {
mContext = context;
// 获取系统默认的UncaughtException处理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
// 设置该CrashHandler为程序的默认处理器
Thread.setDefaultUncaughtExceptionHandler(this);
// catchNomalLogToFile();
}
/**
* 当UncaughtException发生时会转入该函数来处理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
if (!handleException(ex) && mDefaultHandler != null) {
// 如果用户没有处理则让系统默认的异常处理器来处理
mDefaultHandler.uncaughtException(thread, ex);
} else {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
Log.e(TAG, "error : ", e);
}
// 退出程序
System.exit(0);
}
}
/**
* 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
*
* @param ex
* @return true:如果处理了该异常信息;否则返回false.
*/
private boolean handleException(Throwable ex) {
if (ex == null) {
return false;
}
// 使用Toast来显示异常信息
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(mContext, "程序出现异常", Toast.LENGTH_LONG).show();
Looper.loop();
}
}.start();
// 收集设备参数信息
collectDeviceInfo(mContext);
// 保存日志文件
saveCrashInfoToFile(ex);
// catchLog();
return true;
}
/**
* 收集设备参数信息
*
* @param ctx
*/
public void collectDeviceInfo(Context ctx) {
try {
PackageManager pm = ctx.getPackageManager();
PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
if (pi != null) {
String versionName = pi.versionName == null ? "null" : pi.versionName;
String versionCode = pi.versionCode + "";
infos.put("versionName", versionName);
infos.put("versionCode", versionCode);
}
} catch (NameNotFoundException e) {
Log.e(TAG, "collectDeviceInfo an error occured when collect package info", e);
}
Field[] fields = Build.class.getDeclaredFields();
for (Field field : fields) {
try {
field.setAccessible(true);
infos.put(field.getName(), field.get(null).toString());
Log.d(TAG, field.getName() + " : " + field.get(null));
} catch (Exception e) {
Log.e(TAG, "collectDeviceInfo an error occured when collect crash info", e);
}
}
}
private String saveCrashInfoToFile(Throwable ex){
StringBuffer sb = new StringBuffer();
for (Map.Entry<String, String> entry : infos.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key + "=" + value + "\n");
}
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
sb.append(result);
try {
long timestamp = System.currentTimeMillis();
String time = formatter.format(new Date());
String fileName = "V2crash-" + time + "-" + timestamp + ".txt";
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String path = V2Application.mLogSavePath;
File dir = new File(path);
File desFile;
if (!dir.exists()) {
boolean mkdirRes = dir.mkdirs();
if(mkdirRes){
desFile = new File(path + fileName);
if (!desFile.exists()) {
desFile.createNewFile();
}
} else {
desFile = new File(V2Application.mLogSavePath + fileName);
if (!desFile.exists()) {
desFile.createNewFile();
}
}
} else {
desFile = new File(path + fileName);
if (!desFile.exists()) {
desFile.createNewFile();
}
}
FileOutputStream fos = new FileOutputStream(desFile);
fos.write(sb.toString().getBytes());
fos.close();
}
return fileName;
} catch (Exception e) {
Log.e(TAG, "saveCrashInfoToFile an error occured while writing file...", e);
}
return null;
}
// 把所有的log输出到文件
// @SuppressWarnings("unused")
// private void catchNomalLogToFile() {
// File createLogFile = new File(GlobalConfig.getGlobalCrashPath(mContext),
// new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date()) + ".txt");
// V2Log.d(TAG, "Catching log to " + createLogFile.getAbsolutePath());
//// String cmd = "logcat -v time -d -f " + createLogFile.getName();
// String cmd = "logcat -b system -b main -b events -b radio -v time -f " + createLogFile.getAbsolutePath();
// try {
// Runtime.getRuntime().exec(cmd);
// } catch (IOException e) {
// e.printStackTrace();
// }
// }
} // 收集错误信息，收集错误logcat保存到手机SD卡上
boolean sdExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
Log.i(TAG, "sdExist = "+sdExist);
if (sdExist) {
String mLogSavePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "V2_Meet7"
+ File.separator;
CrashHandler.getInstance().init(getApplicationContext());
Log.i(TAG, "错误logcat收集路径："+mLogSavePath);
}
是不是感觉很简单,希望能够帮助到大家