public class MegApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        initLog();
    }

    private void initLog() {
        String dir = Environment.getExternalStorageDirectory().getAbsolutePath();
        File file = new File(dir + File.separator + "Meg-Logs");
        if (!file.exists()) file.mkdirs();
        LogUtils.setLogDir(file.getAbsolutePath());
        LogUtils.setLogLevel(LogUtils.LogLevel.DEBUG);
    }
}

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
       LogUtils.d(TAG, "--start--");
       LogUtils.e(TAG, e.toString());
       LogUtils.d(TAG, "--after dangerous method call--");
       LogUtils.w(TAG, "--test--");

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        LogUtils.close();
    }
}

private static final int LOG_FILES_MAX_NUM = 5; //文件最多有5个
private static final int LOG_FILE_MAX_SIZE = 1024 * 1024; //文件最大1MB