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try {
    Field f;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        f = AbsListView.class.getDeclaredField("mFastScroll");
    } else {
        f = AbsListView.class.getDeclaredField("mFastScroller");
    }
    
    Object o = f.get(getListView());
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {

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classpath 'com.android.tools.build:gradle:2.1.3'

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org.gradle.daemon=true
org.gradle.jvmargs=-Xmx512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
org.gradle.parallel=true
org.gradle.configureondemand=true

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// line on the top of the file:
int minSdk = hasProperty('minSdk') ? minSdk.toInteger() : 15

// replace your earlier minSdkVersion <sdk version number> with:
minSdkVersion minSdk

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-Pminsdk=23

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public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new CountClass().execute("name 1", "name 2", "name 3");
    }

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public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new BgAsyncTask().execute(null, null, null);
    }

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public class ClientEncrypt {
  
private static String publicKeyString = "<your_public_key_here>";
  
  public static void main (String args[]) {
    try {
      
      // 1. generate secret key using AES
      KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
      keyGenerator.init(128); // AES is currently available in three key sizes: 128, 192 and 256 bits.The design and strength of all key lengths of the AES algorithm are sufficient to protect classified information up to the SECRET level

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public class GenerateRsaKeyPair {
  public static void main(String args[]) {
    try {

      // 1. generate public key and private key
      KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
      keyPairGenerator.initialize(1024); // key length
      KeyPair keyPair = keyPairGenerator.genKeyPair();
      String privateKeyString = Base64.encodeToString(keyPair.getPrivate().getEncoded(), Base64.DEFAULT);
      String publicKeyString = Base64.encodeToString(keyPair.getPublic().getEncoded(), Base64.DEFAULT);

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public class ServerDecrypt {

  static String privateKey = "<your_private_key_here>";
  static String encryptedTextString = "<your_received_encrypted_text_here>";
  static String encryptedSecretKeyString = "<your_received_encrypted_secret_key_here>";

  public static void main(String args[]) {

    try {