Android Crash 全局捕获
首先应该明白的一点是,Android在崩溃后会重新启动崩溃时的那个Activity,如果你的Activity在初始化的时候就直接崩溃,那么你将连续得到 Crash 崩溃日志.这个说出来可能没什么,可怜的我在看到崩溃日志时活脱脱的以为
uncaughtException(Thread thread, Throwable ex)方法被调用了两次.知道原因后就很好解决,在崩溃时把Activity栈清空就可以.
1. UncaughtExceptionHandler
这是一个接口,只有一个方法 uncaughtException(Thread t, Throwable e) 而且注释已经说明,这个方法是虚拟机(JVM)去调用.所以我们编写一个类实现此接口就可以了.
public interface UncaughtExceptionHandler {
/**
* Method invoked when the given thread terminates due to the
* given uncaught exception.
* <p>Any exception thrown by this method will be ignored by the
* Java Virtual Machine.
* @param t the thread
* @param e the exception
*/
void uncaughtException(Thread t, Throwable e);
}
2. 异常时的常规处理
1. 显示崩溃前的
Toast
2. 保存崩溃日志信息到sd卡
3. 重启APP
实际项目中,我们需要做好这三件事.
/**
* 异常发生时，系统回调的函数，我们在这里处理一些操作
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
showCrashToast();//展示崩溃前的Toast
saveCrashReport2SD(mContext, ex);//保存崩溃信息到sdcard
restartApp();//重新启动APP
}
3. 完整的代码
需要注意的地方写在注释里了.
public class CrashHandler implements UncaughtExceptionHandler {
private static final String TAG = "CrashHandler";
private Context mContext;
private static CrashHandler mInstance = new CrashHandler();
private CrashHandler() {
}
/**
* 单例模式，保证只有一个CrashHandler实例存在
*
* @return
*/
public static CrashHandler getInstance() {
return mInstance;
}
/**
* 异常发生时，系统回调的函数，我们在这里处理一些操作
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
showCrashToast();
saveCrashReport2SD(mContext, ex);
restartApp();
}
/**
* 为我们的应用程序设置自定义Crash处理
*/
public void initCrashHandler(Context context) {
mContext = context;
Thread.setDefaultUncaughtExceptionHandler(this);
}
private void restartApp() {
Intent intent = new Intent(App.getInstance().getApplicationContext(),
InitAdvsMultiActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent restartIntent = PendingIntent.getActivity(App.getInstance()
.getApplicationContext(), 0, intent, PendingIntent.FLAG_ONE_SHOT);
//重启应用
AlarmManager mgr = (AlarmManager) App.getInstance().getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis(), restartIntent);
//清空Activity栈,防止系统自动重启至崩溃页面,导致崩溃再次出现.
ActivityLifeManager.getInstance().finishAllActivity();
//退出程序
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
System.gc();
}
private void showCrashToast() {
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(App.getInstance().getApplicationContext(), "很抱歉,程序出现异常,即将重启",
Toast.LENGTH_LONG).show();
Looper.loop();
}
}.start();
try {
Thread.sleep(1000);//Toast展示的时间
} catch (InterruptedException e) {
}
}
/**
* 获取一些简单的信息,软件版本，手机版本，型号等信息存放在LinkedHashMap中
*
* @param context
* @return
*/
private HashMap<String, String> obtainSimpleInfo(Context context) {
LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
PackageManager mPackageManager = context.getPackageManager();
PackageInfo mPackageInfo = null;
try {
mPackageInfo = mPackageManager.getPackageInfo(context.getPackageName(),
PackageManager.GET_ACTIVITIES);
} catch (NameNotFoundException e) {
e.printStackTrace();
}
map.put("APP", "AppName");
map.put("用户名", SharedPreferencesUtils.getInstance().getUserName());
map.put("品牌", "" + Build.BRAND);
map.put("型号", "" + Build.MODEL);
map.put("SDK版本", "" + Build.VERSION.SDK_INT);
map.put("versionName", mPackageInfo.versionName);
map.put("versionCode", "" + mPackageInfo.versionCode);
map.put("crash时间", parserTime(System.currentTimeMillis()));
return map;
}
/**
* 获取系统未捕捉的错误信息
*
* @param throwable
* @return
*/
private String obtainExceptionInfo(Throwable throwable) {
StringWriter mStringWriter = new StringWriter();
PrintWriter mPrintWriter = new PrintWriter(mStringWriter);
throwable.printStackTrace(mPrintWriter);
mPrintWriter.close();
Log.e(TAG, mStringWriter.toString());
return mStringWriter.toString();
}
/**
* 保存获取的 软件信息，设备信息和出错信息保存在SDcard中
*
* @param context
* @param ex
* @return
*/
private String saveCrashReport2SD(Context context, Throwable ex) {
String fileName = null;
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : obtainSimpleInfo(context).entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key).append(" = ").append(value).append("
");
}
sb.append(obtainExceptionInfo(ex));
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
File dir = new File(CrashConstant.CRASH_DIR);
if (!dir.exists()) {
dir.mkdirs();
}
try {
fileName = dir.toString() + File.separator + parserTime(System.currentTimeMillis()) +".txt";
FileOutputStream fos = new FileOutputStream(fileName);
fos.write(sb.toString().getBytes());
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return fileName;
}
/**
* 将毫秒数转换成yyyy-MM-dd-HH-mm-ss的格式，并在后缀加入随机数
*
* @param milliseconds
* @return
*/
private String parserTime(long milliseconds) {
System.setProperty("user.timezone", "Asia/Shanghai");
TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai");
TimeZone.setDefault(tz);
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
return format.format(new Date(milliseconds));
}
}