briar/briar-android/src/org/briarproject/android/BaseActivity.java

package org.briarproject.android;

import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
import static org.briarproject.android.TestingConstants.PREVENT_SCREENSHOTS;
import static android.view.WindowManager.LayoutParams.FLAG_SECURE;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.inputmethod.InputMethodManager;

import roboguice.activity.RoboActivity;

public abstract class BaseActivity extends RoboActivity {

    private final static String PREFS_DB = "db";
    private final static String KEY_DB_KEY = "key";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (PREVENT_SCREENSHOTS) getWindow().addFlags(FLAG_SECURE);
    }

    private SharedPreferences getBriarPrefs(String prefsName) {
        return getSharedPreferences(prefsName, MODE_PRIVATE);
    }

    protected String getDbKeyInHex() {
        return getBriarPrefs(PREFS_DB).getString(KEY_DB_KEY, null);
    }

    private void clearPrefs(String prefsName) {
        SharedPreferences.Editor editor = getBriarPrefs(prefsName).edit();
        editor.clear();
        editor.apply();
    }

    protected void clearDbPrefs() {
        this.clearPrefs(PREFS_DB);
    }

    protected void gotoAndFinish(Class classInstance, int resultCode) {
        if (resultCode != Integer.MIN_VALUE)
            this.setResult(resultCode);
        this.startActivity(new Intent(this, classInstance));
        this.finish();
    }

    protected void hideSoftKeyboard()
    {
        Object o = getSystemService(INPUT_METHOD_SERVICE);
        ((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
    }
}