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POGridView Zoom Images
 

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    <p>I've got a gridview and I'm trying to zoom the image on GridView Item Click. Using this sample from google <a href="http://developer.android.com/training/animation/zoom.html" rel="nofollow">http://developer.android.com/training/animation/zoom.html</a> .My question is how do you pass a R.drawable into "int imageResId" . Check out my codes below. </p> <p>MainActivity.java</p> <pre><code>public class GridViewActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTitle("GridView"); setContentView(R.layout.grid_view); GridView gridview = (GridView) findViewById(R.id.gridview); gridview.setAdapter(new ImageAdapter(this)); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_grid_view, menu); return true; } } </code></pre> <p>gridview.xml</p> <pre><code>&lt;GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:columnWidth="90dp" android:numColumns="auto_fit" android:verticalSpacing="10dp" android:horizontalSpacing="10dp" android:stretchMode="columnWidth" android:gravity="center" /&gt; </code></pre> <p>ImageAdapter.java</p> <pre><code> public class ImageAdapter extends BaseAdapter { private Animator mCurrentAnimator; private int mShortAnimationDuration; private Context mContext; public ImageAdapter(Context c) { mContext = c; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return mThumbIds[position]; } public long getItemId(int position) { return 0; } public View getView(final int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(mContext); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); } else { imageView = (ImageView) convertView; } imageView.setImageResource(mThumbIds[position]); imageView.setTag(mThumbIds[position]); imageView.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { int id = (Integer) arg0.getTag(); zoomImageFromThumb(arg0, id); } }); return imageView; } // References to our images in res &gt; drawable public Integer[] mThumbIds = { R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7, R.drawable.sample_8, R.drawable.sample_9, R.drawable.sample_10, R.drawable.sample_11, R.drawable.sample_12, R.drawable.sample_13, R.drawable.sample_14, R.drawable.sample_15, R.drawable.sample_16, R.drawable.sample_17, R.drawable.sample_18 }; private void zoomImageFromThumb(final View thumbView, int imageResId) { if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } final ImageView expandedImageView = (ImageView) thumbView.findViewById(R.id.expanded_image); expandedImageView.setImageResource(imageResId); final Rect startBounds = new Rect(); final Rect finalBounds = new Rect(); final Point globalOffset = new Point(); thumbView.getGlobalVisibleRect(startBounds); thumbView.findViewById(R.id.container).getGlobalVisibleRect(finalBounds, globalOffset); startBounds.offset(-globalOffset.x, -globalOffset.y); finalBounds.offset(-globalOffset.x, -globalOffset.y); float startScale; if ((float) finalBounds.width() / finalBounds.height() &gt; (float) startBounds .width() / startBounds.height()) { // Extend start bounds horizontally startScale = (float) startBounds.height() / finalBounds.height(); float startWidth = startScale * finalBounds.width(); float deltaWidth = (startWidth - startBounds.width()) / 2; startBounds.left -= deltaWidth; startBounds.right += deltaWidth; } else { // Extend start bounds vertically startScale = (float) startBounds.width() / finalBounds.width(); float startHeight = startScale * finalBounds.height(); float deltaHeight = (startHeight - startBounds.height()) / 2; startBounds.top -= deltaHeight; startBounds.bottom += deltaHeight; } thumbView.setAlpha(0f); expandedImageView.setVisibility(View.VISIBLE); expandedImageView.setPivotX(0f); expandedImageView.setPivotY(0f); AnimatorSet set = new AnimatorSet(); set.play( ObjectAnimator.ofFloat(expandedImageView, View.X, startBounds.left, finalBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top, finalBounds.top)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_X, startScale, 1f)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_Y, startScale, 1f)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; final float startScaleFinal = startScale; expandedImageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } AnimatorSet set = new AnimatorSet(); set.play( ObjectAnimator.ofFloat(expandedImageView, View.X, startBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_X, startScaleFinal)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_Y, startScaleFinal)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; } }); } } </code></pre> <p>activity_zoom.xml</p> <pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;ImageView android:id="@+id/expanded_image" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="invisible" /&gt; &lt;/FrameLayout&gt; </code></pre> <p><strong>LOGCAT :</strong></p> <pre><code> 06-14 13:58:47.667: E/AndroidRuntime(14860): FATAL EXCEPTION: main 06-14 13:58:47.667: E/AndroidRuntime(14860): java.lang.NullPointerException 06-14 13:58:47.667: E/AndroidRuntime(14860): at com.example.gridview.ImageAdapter.zoomImageFromThumb(ImageAdapter.java:79) 06-14 13:58:47.667: E/AndroidRuntime(14860): at com.example.gridview.ImageAdapter.access$0(ImageAdapter.java:72) 06-14 13:58:47.667: E/AndroidRuntime(14860): at com.example.gridview.ImageAdapter$1.onClick(ImageAdapter.java:57) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.view.View.performClick(View.java:3620) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.view.View$PerformClick.run(View.java:14292) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.os.Handler.handleCallback(Handler.java:605) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.os.Handler.dispatchMessage(Handler.java:92) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.os.Looper.loop(Looper.java:137) 06-14 13:58:47.667: E/AndroidRuntime(14860): at android.app.ActivityThread.main(ActivityThread.java:4507) 06-14 13:58:47.667: E/AndroidRuntime(14860): at java.lang.reflect.Method.invokeNative(Native Method) 06-14 13:58:47.667: E/AndroidRuntime(14860): at java.lang.reflect.Method.invoke(Method.java:511) 06-14 13:58:47.667: E/AndroidRuntime(14860): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) 06-14 13:58:47.667: E/AndroidRuntime(14860): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) 06-14 13:58:47.667: E/AndroidRuntime(14860): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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