Android Open Source - AndroidPINProtectionExample Pin Activity

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Back to project page AndroidPINProtectionExample.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.pinexample.ui;
/*from   ww w. ja  v a 2  s. co m*/
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.example.pinexample.R;
import com.example.pinexample.utilities.Utilities;
import com.example.pinexample.utilities.NumpadKeyboard;

/**
 * This is the activity screen that represents the PIN protection.
 * @author drakuwa
 *
 */
public class PinActivity extends Activity {
  
  private View numpad;
  private EditText pin;
  private SharedPreferences prefs;
  private String whereTo;
  private int errorCount = 0;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pin);
    if(getIntent().hasExtra("whereTo")) whereTo = getIntent().getStringExtra("whereTo");
    prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    initViews();
  }
  
  /**
   * Initialize the views, the error counter, set the TextChanged listener
   */
  private void initViews(){
    numpad = findViewById(R.id.numpad);
    pin = (EditText) findViewById(R.id.pin);
    new NumpadKeyboard(this, numpad, pin);
    
    pin.setFocusable(false);
    pin.setCursorVisible(false);
    pin.setClickable(false);
    pin.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(start==3){
                    if(Utilities.sha1Hash(s.toString()).equalsIgnoreCase(prefs.getString("pin", ""))){
                      if(whereTo.equalsIgnoreCase("main")){
                      startActivity(new Intent(PinActivity.this, StartActivity.class));
                      finish();}
                      else if(whereTo.equalsIgnoreCase("settings")){
                      startActivity(new Intent(PinActivity.this, ChangePinActivity.class));
                      finish();}
                    } else {
                      errorCount++;
                      if(errorCount >= 5) finish();
                      else {
                        // show an error Toast message, and clear the field
                        Toast.makeText(PinActivity.this, "Wrong PIN.", Toast.LENGTH_SHORT).show();
                        pin.setText("");
                      }
                      //String h = Utilities.sha1Hash(pin.getText().toString().trim());
                      //Log.d(Log.TAG, "NOT OK, SHA-1: "+h);pin.setText("");
                    }
                }
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
            @Override
            public void afterTextChanged(Editable s) {}
        });

  }
}

Java Source Code List

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