Android app coding error

I downloaded a source code and i saw some errors i cannot fix on my on its listed below

MainActivity.java

package com.droidoxy.pocket;

also got error in import android.transition.*;

private void checkReadPhoneStatePermission() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (!hasGetReadPhoneStatePermission()) {
            requestReadPhoneStatePermission();
        }
    }
}

private boolean hasGetReadPhoneStatePermission() {
    return ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED;
}

private void requestReadPhoneStatePermission() {
    //You can choose a more friendly notice text. And you can choose any view you like, such as dialog.
    Toast.makeText(this, "Only grant the permission, can you start the mission!", Toast.LENGTH_SHORT).show();
    ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.READ_PHONE_STATE}, REQUEST_READ_PHONE_STATE);
}

//Callback for requestPermission
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    try {
        switch (requestCode) {
            case REQUEST_READ_PHONE_STATE: {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        Toast.makeText(this, "The Permission has granted,you can get your mission now", Toast.LENGTH_SHORT).show();
                    } else {
                        //had not get the permission
                        Toast.makeText(this, "Not get the permission,so you cannot get your mission", Toast.LENGTH_SHORT).show();
                    }
                    break;
                }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

values/styles.xml

@color/colorPrimary @color/colorPrimaryDark

</style>

    <item name="windowNoTitle">true</item>
</style>

Judging from my knowledge and here Android version check

** I changed **

private void checkReadPhoneStatePermission() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (!hasGetReadPhoneStatePermission()) {
            requestReadPhoneStatePermission();
        }
    }
}

to

private void checkReadPhoneStatePermission() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (!hasGetReadPhoneStatePermission()) {
            requestReadPhoneStatePermission();
        }
    }
}

because M stand for 23 and N stands for 24

others are located here Get Android API level of phone currently running my application

And for

values/styles.xml

@color/colorPrimary @color/colorPrimaryDark

<item name="windowNoTitle">true</item>

I added android: to it to look like

values/styles.xml

@color/colorPrimary @color/colorPrimaryDark

<item name="android:windowNoTitle">true</item>

Dont know much but hope I need help