Android - uninstall app programmatically

private void uninstallPackage(String name) {
    Intent intent = new Intent(Intent.ACTION_DELETE);
    intent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
    intent.setData(Uri.parse("package:"+name));
    startActivity(intent);
}

private boolean doesPackageExist(String name){
    PackageManager pm=getPackageManager();
    try {
        PackageInfo info=pm.getPackageInfo(name,PackageManager.GET_META_DATA);
    } catch (PackageManager.NameNotFoundException e) {
        return false;
    }
    return true;
}

private void checkUninstallStatus(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1) {
        if (resultCode == RESULT_OK) {
            Log.d("TAG", "onActivityResult: user accepted the (un)install");
        } else if (resultCode == RESULT_CANCELED) {
            Log.d("TAG", "onActivityResult: user canceled the (un)install");
        } else if (resultCode == RESULT_FIRST_USER) {
            Log.d("TAG", "onActivityResult: failed to (un)install");
        }
    }
}

@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
    checkUninstallStatus(requestCode,resultCode,data);
}

Probabilistic algorithms

https://www.safaribooksonline.com/oriole/probabilistic-data-structures-in-python

Set Cardinality - HyperLogLog

Set Membership - With False positives but no False negatives - Bloom Filter

Set similarity (document similarity) - MinHash with Jaccard

Frequency Summaries (Leaderboards in games) - Count-min sketch

Streaming Quantiles - stream of data where you have to aggregate metrics without stopping - T-Digest (like min/max/percentile)

Java print current stack trace

StringWriter sw = new StringWriter();
new Throwable().printStackTrace(new PrintWriter(sw));

//And to actually print it
Log.e("tag","Current stack trace is:\n" + sw.toString());

Git show entire history of a file

git log --pretty=format:"%h" <filePath> | xargs -I % git show % <filepath>

Java - iterate over a UTF-8 string

Either read the file as UTF-8 or convert it later.


public static void main(String[] args) throws Exception {

String path = "D:\\test.txt";

FileInputStream stream = new FileInputStream(new File(path));

BufferedReader br = new BufferedReader(new InputStreamReader(stream,"UTF-8"));

String str;

while ((str = br.readLine()) != null) {

System.out.println(str.length());

for(int i = 0; i< str.length(); ++i) {

System.out.println(String.format("%04x",(int)str.charAt(i)));

}

}

}

OR

BufferedReader br = new BufferedReader(new InputStreamReader(stream));
String str;
while ((str = br.readLine()) != null) {
byte[] ptext = str.getBytes(ISO_8859_1);
str = new String(ptext, UTF_8);
System.out.println(str.length());
for(int i = 0; i< str.length(); ++i) {
System.out.println(String.format("%04x",(int)str.charAt(i)));
}
}

Java get unicode point of a character

class Main {

  public static void main(String[] args) {

char ch = 'ö';

System.out.println(getUnicodePoint(ch));

ch = 'म';

System.out.println(getUnicodePoint(ch));

  }

  private static String getUnicodePoint(char ch) {

      String hex = String.format("%04x", (int) ch);

       return hex;

  }

}

outlook not starting

https://support.office.com/en-us/article/Outlook-not-responding-stuck-at-Processing-stopped-working-freezes-or-hangs-5c313d04-64af-4441-82d2-44e5a43eee5a

Start Outlook in safe mode to fix "Processing" screen

If Outlook stops responding at a screen that says "Processing," you can close Outlook, start it in safe mode, then close it and open it normally to fix the problem.

Close Outlook.

Launch Outlook in safe mode by choosing one of the following options.

In Windows 10, choose Start, type Outlook.exe /safe, and press Enter.

In Windows 7, choose Start, and in the Search programs and files box, type Outlook /safe, and then press Enter.

In Windows 8, on the Apps menu, choose Run, type Outlook /safe, and then choose OK.

Close Outlook, and then open it normally.