Android性能优化 Java Crash监控
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文章目录
1.什么是Crash
- Crash也就是APP代码异常奔溃,从而导致App闪退,也许我们在开发的时候测试一切正常,但是在线上,用户量多起来之后,什么五花八门的机子都有,多多少少会发生Crash。
- 当App奔溃后,我们应及时记录下问题,保存到文件,待下次启动app时,再上传服务器,然后分析错误日志,修改问题。
- android 有Java层的Crash,还有Native层Carsh,这次先了解怎么拿到Java层的Crash。
2.Java层Crash
- Java的Crash比较简单,Java中的Thread定义了一个接口:UncaughtExceptionHandler,用于处理未捕获的异常导致线程的终止,但是try/catch 的错误捕获不了。
- 当我们的应用crash的时候,就会走 UncaughtExceptionHandler.uncaughtException ,在该方法中可以获取到异常的信息,通过 Thread.setDefaultUncaughtExceptionHandler 该方法来设置线程的默认异常处理器。
- 重写完成 uncaughtException 逻辑后,记得再调用一次uncaughtException(t, e),否则可能会白屏,APP也在那傻等。
- Carsh文件可以保存后上传服务器,也可以在下次打开App上传。
2.1 保存Crash信息
public class TestCrashHandler implements Thread.UncaughtExceptionHandler
//crash存储文件夹, /Android/data/包名/files/crash_info/目录下
private static final String CRASH_FILES = "crash_info";
//crash文件后缀
private static final String CRASH_FILE_NAME = "_crash.txt";
private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
private static Context mContext;
private static Thread.UncaughtExceptionHandler uncaughtExceptionHandler;
private SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
public static void init(Context context)
mContext = context.getApplicationContext();
uncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(new TestCrashHandler());
@Override
public void uncaughtException(@NonNull @NotNull Thread t, @NonNull @NotNull Throwable e)
saveCrash(t, e);
/**
* 将Crash信息保存起来
*
* @param t
* @param e
*/
private void saveCrash(@NonNull @NotNull Thread t, @NonNull @NotNull Throwable e)
//创建文件夹 /Android/data/包名/files/crash_info/目录下
File dir = mContext.getExternalFilesDir(CRASH_FILES);
if (!dir.exists())
dir.mkdirs();
//Crash时间
String time = dateFormat.format(System.currentTimeMillis());
File file = new File(dir, time + CRASH_FILE_NAME);
PrintWriter printWriter = null;
FileWriter fileWriter = null;
try
fileWriter = new FileWriter(file);
printWriter = new PrintWriter(fileWriter);
//异常时间
printWriter.write("Crash_Time : " + time + "\\n");
//手机信息
printWriter.write(phoneInfo());
//线程信息
printWriter.write("Thread : " + t.getName() + "\\n");
//异常信息
printWriter.write("Exception : " );
e.printStackTrace( printWriter);
catch (IOException | PackageManager.NameNotFoundException ioException)
ioException.printStackTrace();
finally
try
if (printWriter != null)
printWriter.flush();
printWriter.close();
if (fileWriter != null)
fileWriter.flush();
fileWriter.close();
catch (IOException ioException)
ioException.printStackTrace();
//如果不写,APP就可能白屏,不闪退,也就是不处理
if (uncaughtExceptionHandler != null)
uncaughtExceptionHandler.uncaughtException(t, e);
/**
* 获取App信息、手机信息、获取其他需要的信息
*
* @return
* @throws PackageManager.NameNotFoundException
*/
private String phoneInfo() throws PackageManager.NameNotFoundException
StringBuilder stringBuilder = new StringBuilder();
PackageManager pkm = mContext.getPackageManager();
PackageInfo packageInfo = pkm.getPackageInfo(mContext.getPackageName(), PackageManager.GET_ACTIVITIES);
//App版本
stringBuilder.append("App_VersionName : ");
stringBuilder.append(packageInfo.versionName);
stringBuilder.append("\\n");
stringBuilder.append("App_VersionCode : ");
stringBuilder.append(packageInfo.versionCode);
stringBuilder.append("\\n");
//Android版本号
stringBuilder.append("Android_Version : ");
stringBuilder.append(Build.VERSION.RELEASE);
stringBuilder.append("\\n");
stringBuilder.append("Android_VersionCode : ");
stringBuilder.append(Build.VERSION.SDK_INT);
stringBuilder.append("\\n");
//手机厂商
stringBuilder.append("Vendor : ");
stringBuilder.append(Build.MANUFACTURER);
stringBuilder.append("\\n");
//手机型号
stringBuilder.append("Phone_Model : ");
stringBuilder.append(Build.MODEL);
stringBuilder.append("\\n");
//CPU架构
stringBuilder.append("CPU : ");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
stringBuilder.append(Arrays.toString(Build.SUPPORTED_ABIS));
else
stringBuilder.append(Build.CPU_ABI);
stringBuilder.append("\\n");
return stringBuilder.toString();
2.2 测试
public class CrashTestReport
public static void init(Context application)
TestCrashHandler.init(application);
/**
* RuntimeException
*/
public static void test1()
int i = 1/0;
/**
* StackOverflowError
*/
public static void test2()
test2();
2.3 文件里的Crash信息
- test1方法测试结果,RuntimeException。
Crash_Time : 2021-06-04 22:43:56
App_VersionName : 1.0
App_VersionCode : 1
Android_Version : 10
Android_VersionCode : 29
Vendor : HUAWEI
Phone_Model : VOG-AL00
CPU : [arm64-v8a, armeabi-v7a, armeabi]
Thread : main
Exception : java.lang.RuntimeException: Unable to start activity ComponentInfocom.bao.myapplication/com.bao.myapplication.MainActivity: java.lang.ArithmeticException: divide by zero
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3898)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2462)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:219)
at android.app.ActivityThread.main(ActivityThread.java:8393)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
Caused by: java.lang.ArithmeticException: divide by zero
at com.bao.myapplication.carsh.CrashTestReport.test1(CrashTestReport.java:11)
at com.bao.myapplication.MainActivity.onCreate(MainActivity.kt:79)
at android.app.Activity.performCreate(Activity.java:8121)
at android.app.Activity.performCreate(Activity.java:8109)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3871)
... 11 more
- test2 方法测试结果,StackOverflowError。
Crash_Time : 2021-06-05 00:49:39
App_VersionName : 1.0
App_VersionCode : 1
Android_Version : 10
Android_VersionCode : 29
Vendor : HUAWEI
Phone_Model : VOG-AL00
CPU : [arm64-v8a, armeabi-v7a, armeabi]
Thread : main
Exception : java.lang.StackOverflowError: stack size 8192KB
at com.bao.myapplication.carsh.CrashTestReport.test2(CrashTestReport.java:15)
at com.bao.myapplication.carsh.CrashTestReport.test2(CrashTestReport.java:15)
at com.bao.myapplication.carsh.CrashTestReport.test2(CrashTestReport.java:15)
.
.
at com.bao.myapplication.carsh.CrashTestReport.test2(CrashTestReport.java:15)
at com.bao.myapplication.carsh.CrashTestReport.test2(CrashTestReport.java:15)
at com.bao.myapplication.MainActivity.onCreate(MainActivity.kt:79)
at android.app.Activity.performCreate(Activity.java:8121)
at android.app.Activity.performCreate(Activity.java:8109)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3871)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2462)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:219)
at android.app.ActivityThread.main(ActivityThread.java:8393)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
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