我制作了一个在网格视图中显示图片的Android应用。在触摸图像时，它会放大。单击缩放的图像会打开一个新的活动。我想为网格视图上的每个图像打开一个新的Activity。有人可以帮帮我吗？
以下是代码：
MainActivity.java
public class MainActivity extends Activity {
// Declare variables / references
private GridView gv;
private Animator mCurrentAnimator;
private int mShortAnimationDuration;
// Create Array thumbs resource id's:
private int thumb[] = { R.drawable.c4, R.drawable.c2,R.drawable.c1,R.drawable.c1,R.drawable.c1,R.drawable.c1,R.drawable.c1,R.drawable.c1,R.drawable.c1,R.drawable.c1};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize the variables:
gv = (GridView) findViewById(R.id.gridView);
// Set an Adapter to the ListView
gv.setAdapter(new ImageAdapter(this));
// Set on item click listener to the ListView
gv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int pos,
long id) {
// Display the zoomed in image in full screen
zoomImageFromThumb(v, thumb[pos]);
ImageView iv=(ImageView)findViewById(R.id.expanded_image);
iv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(getApplicationContext(),K.class);
startActivity(i);
}
});
}
});
// Set the Animation time form the android defaults
mShortAnimationDuration = getResources().getInteger(
android.R.integer.config_shortAnimTime);
}
// Create an Adapter Class extending the BaseAdapter
class ImageAdapter extends BaseAdapter {
private LayoutInflater layoutInflater;
public ImageAdapter(MainActivity activity) {
// TODO Auto-generated constructor stub
layoutInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// Set the count value to the total number of items in the Array
return thumb.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Inflate the item layout and set the views
View listItem = convertView;
int pos = position;
if (listItem == null) {
listItem = layoutInflater.inflate(R.layout.grid_item, null);
}
// Initialize the views in the layout
ImageView iv = (ImageView) listItem.findViewById(R.id.thumb);
// Set the views in the layout
iv.setBackgroundResource(thumb[pos]);
return listItem;
}
}
private void zoomImageFromThumb(final View thumbView, int imageResId) {
// If there's an animation in progress, cancel it immediately and
// proceed with this one.
if (mCurrentAnimator != null) {
mCurrentAnimator.cancel();
}
// Load the high-resolution "zoomed-in" image.
final ImageView expandedImageView = (ImageView) findViewById(R.id.expanded_image);
expandedImageView.setImageResource(imageResId);
// Calculate the starting and ending bounds for the zoomed-in image.
// This step
// involves lots of math. Yay, math.
final Rect startBounds = new Rect();
final Rect finalBounds = new Rect();
final Point globalOffset = new Point();
// The start bounds are the global visible rectangle of the thumbnail,
// and the
// final bounds are the global visible rectangle of the container view.
// Also
// set the container view's offset as the origin for the bounds, since
// that's
// the origin for the positioning animation properties (X, Y).
thumbView.getGlobalVisibleRect(startBounds);
findViewById(R.id.container).getGlobalVisibleRect(finalBounds,
globalOffset);
startBounds.offset(-globalOffset.x, -globalOffset.y);
finalBounds.offset(-globalOffset.x, -globalOffset.y);
// Adjust the start bounds to be the same aspect ratio as the final
// bounds using the
// "center crop" technique. This prevents undesirable stretching during
// the animation.
// Also calculate the start scaling factor (the end scaling factor is
// always 1.0).
float startScale;
if ((float) finalBounds.width() / finalBounds.height() > (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;
}
// Hide the thumbnail and show the zoomed-in view. When the animation
// begins,
// it will position the zoomed-in view in the place of the thumbnail.
thumbView.setAlpha(0f);
expandedImageView.setVisibility(View.VISIBLE);
// Set the pivot point for SCALE_X and SCALE_Y transformations to the
// top-left corner of
// the zoomed-in view (the default is the center of the view).
expandedImageView.setPivotX(0f);
expandedImageView.setPivotY(0f);
// Construct and run the parallel animation of the four translation and
// scale properties
// (X, Y, SCALE_X, and SCALE_Y).
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;
// Upon clicking the zoomed-in image, it should zoom back down to the
// original bounds
// and show the thumbnail instead of the expanded image.
final float startScaleFinal = startScale;
expandedImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mCurrentAnimator != null) {
mCurrentAnimator.cancel();
}
// Animate the four positioning/sizing properties in parallel,
// back to their
// original values.
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;
}
});
}
}
main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000" >
<GridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="80dp"
android:horizontalSpacing="10dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp" >
</GridView>
<ImageView
android:id="@+id/expanded_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/app_name"
android:visibility="invisible"
android:clickable="true"/>
</FrameLayout>
grid_item.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp" >
<ImageView
android:id="@+id/thumb"
android:layout_width="72dp"
android:layout_height="72dp"
android:layout_centerHorizontal="true"
android:contentDescription="@string/app_name" />
</RelativeLayout>