Question

So i’ve searched and searched and I’ve found nothing like I’m looking. I have several ListActivities and I can click one and go to the next list and next list etc… What I want is when i click on the appropriate list item i want it to display an image from the res folder. I have been stuck on this all afternoon and nothing is working that i can find. Any help would be great. Example When CoverSheet is selected it retrieves cover_sheet.png.
Thanks James

The entry point of the application: Menu.java

public class Menu extends ListActivity 
{ 
    public static final String EXTRA_PICTURE = "extra.picture.toshow"; 

    String classes[] = { "CoverSheet",// "TreatmentProtocols", "EMSProcedures",
           // "DrugList", "EMSPolicies", "EMSTriageAndDestinationPlan",  
           // "Appendices"
            }; 
    //in this array you store the drawable resource ids to show.  
    //you can change it to hold urls or other identifiers. 
    int images[] = { R.drawable.cover_sheet, }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
        super.onCreate(savedInstanceState); 
        setListAdapter(new ArrayAdapter<String>(Menu.this,  
                android.R.layout.simple_list_item_1, classes)); 
    } 

    protected void onCreate1(Bundle savedInstanceState) 
    { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.imageview); 
        final int imgResource = getIntent().getIntExtra(Menu.EXTRA_PICTURE, 0);
        final ImageView img = (ImageView)findViewById(R.id.img); 
        img.setImageResource(imgResource); }

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) 
    { 
        super.onListItemClick(l, v, position, id); 
        String Menu = classes[position]; 
        try 
        { 
            Class firstClass = Class.forName("protocols.NashCounty." + Menu); 
            Intent firstIntent = new Intent(Menu.this, firstClass); 
            firstIntent.putExtra(EXTRA_PICTURE, images[position]); 
            startActivity(firstIntent); 
        } 
        catch (ClassNotFoundException e) 
        { 
            Log.e("SAMPLE", "ClassNotFoundException ", e); 
        } 
        catch (Exception e) 
        { 
            Log.e("SAMPLE", "Exception ", e); 
        } 
    } 
} 

This is my Class i’ve created

public class CoverSheet extends ListActivity
{
    public static final String EXTRA_PICTURE = "extra.picture.toshow";
    String classes[] = { "CoverSheet", };
    // in this array you store the drawable resource ids to show.
    // you can change it to hold urls or other identifiers.
    int images[] = { R.drawable.cover_sheet };

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.imageview);
        final int imgResource = getIntent().getIntExtra(
                CoverSheet.EXTRA_PICTURE, 0);
        final ImageView img = (ImageView) findViewById(R.id.img);
        img.setImageResource(imgResource);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id)
    {
        super.onListItemClick(l, v, position, id);
        String coversheet = classes[position];
        try
        {
            Class firstClass = Class.forName("protocols.NashCounty."+classes);
            Intent firstIntent = new Intent(CoverSheet.this, firstClass);
            firstIntent.putExtra(EXTRA_PICTURE, images[position]);
            startActivity(firstIntent);
        }
        catch (ClassNotFoundException e)
        {
            Log.e("SAMPLE", "ClassNotFoundException ", e);
        }
        catch (Exception e)
        {
            Log.e("SAMPLE", "Exception ", e);
        }
    }
}

Below is my xml layout l named imageview

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:orientation="vertical">
    <ImageView android:id="@+id/img"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:src="@drawable/cover_sheet" />
</LinearLayout>

and below is my minifest

<activity android:name=".activity.CoverSheet"  
android:theme="@android:style/Theme.NoTitleBar.Fullscreen" /> 
</application>
</manifest>

i was misunderstanding what you were saying earlier and i apologize for that i think im starting to undestand it…i think.

below is my logcat error when trying to run the code:

05-18 17:15:26.221: E/AndroidRuntime(618): FATAL EXCEPTION: main
05-18 17:15:26.221: E/AndroidRuntime(618): java.lang.ArrayIndexOutOfBoundsException: length=1; index=3
05-18 17:15:26.221: E/AndroidRuntime(618): at protocols.NashCounty.Menu.onListItemClick(Menu.java:40)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.app.ListActivity$2.onItemClick(ListActivity.java:319)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.widget.AdapterView.performItemClick(AdapterView.java:292)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.widget.AbsListView.performItemClick(AbsListView.java:1058)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.widget.AbsListView$1.run(AbsListView.java:3168)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.os.Handler.handleCallback(Handler.java:605)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.os.Handler.dispatchMessage(Handler.java:92)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.os.Looper.loop(Looper.java:137)
05-18 17:15:26.221: E/AndroidRuntime(618): at android.app.ActivityThread.main(ActivityThread.java:4424)
05-18 17:15:26.221: E/AndroidRuntime(618): at java.lang.reflect.Method.invokeNative(Native Method)
05-18 17:15:26.221: E/AndroidRuntime(618): at java.lang.reflect.Method.invoke(Method.java:511)
05-18 17:15:26.221: E/AndroidRuntime(618): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-18 17:15:26.221: E/AndroidRuntime(618): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-18 17:15:26.221: E/AndroidRuntime(618): at dalvik.system.NativeStart.main(Native Method)

Answer 1

I assume you are showing images in the activities whose names are listed inside the classes variable.

Make sure all the classes listed there are also included in the androidManifest.xml with a proper <activity />tag and with the correct package declaration!

Your use of casing the variables and package names is misleading, but I think your application package is protocols.NashCountry, so inside the manifest there should be a line similar to this:

<activity android:name=".activity.CoverSheet" android:label="@string/app_name" />

for each activity class you want to call.

You should also try to change the

e.printStackTrace();

into

Log.e("SAMPLE", "ClassNotFoundException ", e);

Edit: To make your subsequent activities to be displayed in full screen, you need to set android:theme attribute in your manifest:

<activity android:name=".activity.CoverSheet" 
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen" />
<activity android:name=".activity.TreatmentProtocols" 
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen" />

the code below shows how to deal with Intent extras:

public class Menu extends ListActivity
{
    public static final String EXTRA_PICTURE = "extra.picture.toshow";
    String classes[] = { "CoverSheet", "TreatmentProtocols", "EMSProcedures", 
            "DrugList", "EMSPolicies", "EMSTriageAndDestinationPlan", 
            "Appendices" };
    //in this array you store the drawable resource ids to show. 
    //you can change it to hold urls or other identifiers.
    int images[] = { R.drawable.coversheet, R.drawable.img2, R.drawable.img3, 
        R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7};

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setListAdapter(new ArrayAdapter<String>(Menu.this, 
                android.R.layout.simple_list_item_1, classes));
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id)
    {
        super.onListItemClick(l, v, position, id);
        String Menu = classes[position];
        try
        {
            Class firstClass = Class.forName("protocols.NashCounty." + Menu);
            Intent firstIntent = new Intent(Menu.this, firstClass);
            firstIntent.putExtra(EXTRA_PICTURE, images[position]);
            startActivity(firstIntent);
        }
        catch (ClassNotFoundException e)
        {
            Log.e("SAMPLE", "ClassNotFoundException ", e);
        }
        catch (Exception e)
        {
            Log.e("SAMPLE", "Exception ", e);
        }
    }
}

And finally, the onCreate methods in your classes should display the proper image based on the extra provided to them:

protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.full_img);
    final int imgResource = getIntent().getIntExtra(Menu.EXTRA_PICTURE, 0);
    final ImageView img = (ImageView)findViewById(R.id.img);
    img.setImageResource(imgResource);
}

Please note, that if you just need to display different images based on list item clicks, you don’t need separate activities, and you don’t have to access them by name: you should use a single activity, and pass the id of the image to it as an extra parameter when starting the intent.

Edit: Your CoverSheet activity class should look like this:

public class CoverSheet extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.imageview);
        final int imgResource = getIntent().getIntExtra(Menu.EXTRA_PICTURE, 0);
        final ImageView img = (ImageView)findViewById(R.id.img);
        img.setImageResource(imgResource);
    }
}

It is very simple, no need to extend ListActivity, since you don’t want to deal with any list there, you just want to display a picture.

Other variables are also useless for this scenario!

Edit 2: Your onListItemClick method should get simpler too! There is no need for dynamically retrieve classes, so you can completely remove the classes array variable from your Menu activity as well.

@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
    super.onListItemClick(l, v, position, id);
    try
    {
        Intent firstIntent = new Intent(Menu.this, CoverSheet.class);
        firstIntent.putExtra(EXTRA_PICTURE, images[position]);
        startActivity(firstIntent);
    }
    catch (Exception e)
    {
        Log.e("SAMPLE", "Exception ", e);
    }
}