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POSaving variables to onsavedinstance and determine whether or not they aren't null
 

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    <p><strong>What would be the best way to only save strings/images from existing ImageViews/TextBoxes depending on the layout file? Should I just check what layout I'm currently using (using the contentView variable) and based on that save from those existing TextBoxes or ?</strong></p> <p>So I have 4 Layouts for both Landscape and Portrait:</p> <ol> <li>main.xml (Choose between select image from SD or from application itself)</li> <li>imagefromsd.xml (Corresponding layout for SD)</li> <li>imagefromapplication (Corresponding layout for application)</li> <li>finishandupload.xml (Where I display the result and give option to save/upload image)</li> </ol> <p>So the problem is I get nullpointer exceptions when switching between landscape and portrait I use <code>protected void onSaveInstanceState(Bundle outState)</code> and <code>protected void onRestoreInstanceState(Bundle savedInstanceState)</code>.</p> <p>This happens because I save strings from textboxes and images from ImageViews, but not every layout file has all textboxes, so when I try to save a string from an unexisting textbox I get nullpointer exceptions.</p> <p>Right now I'm saving the current contentView in a variable when I change the setContentView.</p> <pre><code> public void ShowLoadAPP(View v){ //Leave menu and show view for images from application setContentView(R.layout.imagefromapplication); contentView = R.layout.imagefromapplication; LoadDrawables(); //Load list with images and show the first image } public void ShowLoadSD(View v){ //Leave menu and show view for images from sd setContentView(R.layout.imagefromsd); contentView = R.layout.imagefromsd; } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onRestoreInstanceState(savedInstanceState); setContentView(savedInstanceState.getInt("MyView")); //Lines where application crashes because of nullpointer where the retrieved string doesn't exist. ((ImageView)findViewById(R.id.imgMeme)).setImageResource(savedInstanceState.getInt("MyImage")); ((EditText)findViewById(R.id.txtImageTop)).setText(savedInstanceState.getString("MyTopString")); ((EditText)findViewById(R.id.txtImageButtom)).setText(savedInstanceState.getString("MyButtomString")); ((ImageView)findViewById(R.id.imgMemeFinished)).setImageBitmap((Bitmap) savedInstanceState.getParcelable("MyBitmap")); } @Override protected void onSaveInstanceState(Bundle outState) { // TODO Auto-generated method stub contentView = contentView == null ? R.layout.menu : contentView; selectedImage = selectedImage == null ? R.drawable.are_you_fucking_kidding : selectedImage; stringTop = ((EditText)findViewById(R.id.txtImageTop)).getText().toString() == null ? "" : ((EditText)findViewById(R.id.txtImageTop)).getText().toString(); stringButtom = ((EditText)findViewById(R.id.txtImageButtom)).getText().toString() == null ? "" : ((EditText)findViewById(R.id.txtImageButtom)).getText().toString(); combinedImage = combinedImage; outState.putInt("MyView", contentView); outState.putInt("MyImage", selectedImage); outState.putString("MyTopString", stringTop); outState.putString("MyButtomString", stringButtom); outState.putParcelable("MyBitmap", combinedImage); super.onSaveInstanceState(outState); } </code></pre> <p> </p> <pre><code>&lt;ImageView android:id="@+id/imgMemeFinished" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="50" android:contentDescription="@string/imgMemeFinishedDescription" /&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;Button android:id="@+id/btnSave" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:onClick="SaveImage" android:text="@string/btnSave" /&gt; &lt;Button android:id="@+id/btnUpload" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:onClick="UploadImage" android:text="@string/btnUpload" /&gt; &lt;/LinearLayout&gt; </code></pre> <p></p> <p> </p> <pre><code>&lt;ImageView android:id="@+id/imgMeme" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="50" android:contentDescription="@string/imgMemeDescription" /&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;EditText android:id="@+id/txtImageTop" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:ems="10" android:inputType="text" android:text="@string/txtImageTop" /&gt; &lt;EditText android:id="@+id/txtImageButtom" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:ems="10" android:inputType="text" android:text="@string/txtImageButtom" /&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;Button android:id="@+id/btnPreviousImage" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:onClick="PreviousImage" android:text="@string/btnPreviousImage" /&gt; &lt;Button android:id="@+id/btnNextImage" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:onClick="NextImage" android:text="@string/btnNextImage" /&gt; &lt;Button android:id="@+id/btnFinish" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.25" android:onClick="ShowFinish" android:text="@string/btnFinish" /&gt; &lt;/LinearLayout&gt; </code></pre> <p></p>
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