我正在尝试对图像切换器进行缩放缩放。我现在被困在如何在ontouch方法中声明imageview。我意识到ImageView i =（Imageview）v是不正确的，我只是不知道要将它切换为在ontouch中声明imageswitcher imageview ... 这是我的java和xml。谢谢你的帮助！
public class ImageSwitch1 extends Activity implements
AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory, OnTouchListener {
Matrix matrix = new Matrix();
Matrix eventMatrix = new Matrix();
final static int NONE = 0;
final static int DRAG = 1;
final static int ZOOM = 2;
int touchState = NONE;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.imageswitcher);
mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
mSwitcher.setFactory(this);
mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_in));
mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_out));
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setOnItemSelectedListener(this);
}
public void onItemSelected(AdapterView parent, View v, int position, long id) {
final TextView tv = (TextView)findViewById(R.id.SwitcherText);
mSwitcher.setImageResource(mImageIds[position]);
tv.setText(mText[position]);
}
public void onNothingSelected(AdapterView parent) {
}
public View makeView() {
ImageView i = new ImageView(this);
i.setScaleType(ScaleType.MATRIX);
i.setBackgroundColor(0xFF000000);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
i.setOnTouchListener(this);
return i;
}
final static float MIN_DIST = 50;
static float eventDistance = 0;
static float centerX =0, centerY = 0;
public boolean onTouch(View v, MotionEvent event) {
ImageView i = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
//primary touch event starts: remember touch down location
touchState = DRAG;
centerX = event.getX(0);
centerY = event.getY(0);
eventMatrix.set(matrix);
break;
case MotionEvent.ACTION_POINTER_DOWN:
//secondary touch event starts: remember distance and center
eventDistance = calcDistance(event);
calcMidpoint(centerX, centerY, event);
if (eventDistance > MIN_DIST) {
eventMatrix.set(matrix);
touchState = ZOOM;
}
break;
case MotionEvent.ACTION_MOVE:
if (touchState == DRAG) {
//single finger drag, translate accordingly
matrix.set(eventMatrix);
matrix.setTranslate(event.getX(0) - centerX,
event.getY(0) - centerY);
} else if (touchState == ZOOM) {
//multi-finger zoom, scale accordingly around center
float dist = calcDistance(event);
if (dist > MIN_DIST) {
matrix.set(eventMatrix);
float scale = dist / eventDistance;
matrix.postScale(scale, scale, centerX, centerY);
}
}
// Perform the transformation
i.setImageMatrix(matrix);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
touchState = NONE;
break;
}
return true;
}
private float calcDistance(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void calcMidpoint(float centerX, float centerY,
MotionEvent event) {
centerX = (event.getX(0) + event.getX(1))/2;
centerY = (event.getY(0) + event.getY(1))/2;
}
private ImageSwitcher mSwitcher;
public class ImageAdapter extends BaseAdapter {
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);
i.setImageResource(mThumbIds[position]);
i.setAdjustViewBounds(true);
i.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
i.setBackgroundResource(R.drawable.picture_frame);
return i;
}
private Context mContext;
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Rellayout1"
android:layout_width="match_parent" android:layout_height="match_parent" android:isScrollContainer="true">
<RelativeLayout android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:isScrollContainer="true" android:layout_marginBottom="120dp">
<ImageSwitcher android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:id="@+id/switcher"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="60dp"
>
</ImageSwitcher>
<Gallery android:spacing="16dp" android:layout_height="80dp" android:id="@+id/gallery" android:unselectedAlpha="0.5" android:background="#55000000" android:gravity="center_vertical" android:layout_width="match_parent" android:minHeight="20px"></Gallery>
</RelativeLayout>
<ScrollView
android:id="@+id/ScrollViewSwitcher"
android:layout_width="fill_parent" android:scrollbarAlwaysDrawVerticalTrack="true" android:isScrollContainer="true" android:layout_alignParentBottom="true" android:layout_height="120dp">
<TextView android:scrollbarAlwaysDrawVerticalTrack="true" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/SwitcherText" android:textSize="18dp"></TextView>
</ScrollView>
</RelativeLayout>
答案 0 :(得分：0)
我解决了这个问题，改变了这一行：
ImageView i = (ImageView) v;
通过
ImageView i = mSwitcher;
但是不能使用矩阵，imageSwitcher不使用矩阵，或者我不知道它是如何完成的。
我希望能帮到你。