code and ui refactoring in the Password activity, encapsulation and wrappers.

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

@@ -0,0 +1,56 @@
+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);
+    }
+}