在Android中如何在ViewPager中显示图像?
我的在Android中如何在ViewPager中显示图像?,android,Android,我的网格视图中有一个图像。现在我想在下一个活动中的查看页面中显示图像。我正试图在另一个类中为该图像视图(视图)设置一个位图。但是运行后,应用程序图像不会显示在查看页面。谢谢 兔子是密码 public class FullScreenViewActivity extends Activity { private FullScreenImageAdapter adapter; private ViewPager viewPager; private ArrayList<
网格视图中有一个图像。现在我想在下一个活动中的查看页面中显示图像。我正试图在另一个类中为该图像视图(视图)设置一个位图。但是运行后,应用程序图像不会显示在查看页面。谢谢
兔子是密码
public class FullScreenViewActivity extends Activity
{
private FullScreenImageAdapter adapter;
private ViewPager viewPager;
private ArrayList<String> mThumbIds = new ArrayList<String>();
@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen_view);
viewPager = (ViewPager) findViewById(R.id.pager);
Intent i = getIntent();
mThumbIds = (ArrayList<String>) this.getIntent().getSerializableExtra("data");
System.out.println("mThumbIds = " + mThumbIds);
int position = i.getIntExtra("id", 0);
System.out.println("position = " + position);
adapter = new FullScreenImageAdapter(this , mThumbIds);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
}
}
公共类FullScreenViewActivity扩展活动
{
专用全屏图像适配器;
私人视页机视页机;
private ArrayList mThumbIds=new ArrayList();
@抑制警告(“未选中”)
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u全屏视图);
viewPager=(viewPager)findViewById(R.id.pager);
Intent i=getIntent();
mThumbIds=(ArrayList)this.getIntent().getSerializableExtra(“数据”);
System.out.println(“mThumbIds=“+mThumbIds”);
int position=i.getIntExtra(“id”,0);
系统输出打印项次(“位置=”+位置);
adapter=新的FullScreenImageAdapter(此为mThumbIds);
viewPager.setAdapter(适配器);
viewPager.setCurrentItem(位置);
}
}
下面是适配器类
public class FullScreenImageAdapter extends PagerAdapter implements OnTouchListener{
private Activity _activity;
private ArrayList<String> _imagePaths;
private LayoutInflater inflater;
Bitmap bitmap;
// constructor
public FullScreenImageAdapter(Activity activity,ArrayList<String> imagePaths) {
this._activity = activity;
this._imagePaths = imagePaths;
}
@Override
public int getCount() {
return this._imagePaths.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Button btnClose;
Button btnEdit;
TouchImageView imgDisplay;
inflater = (LayoutInflater) _activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image, container, false);
imgDisplay = (TouchImageView) viewLayout.findViewById(R.id.imgDisplay);
imgDisplay.setOnTouchListener((OnTouchListener) this);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.inSampleSize = 8;
bitmap = BitmapFactory.decodeFile(_imagePaths.get(position), options);
imgDisplay.setImageBitmap(bitmap);
btnClose = (Button) viewLayout.findViewById(R.id.btnClose);
btnClose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
_activity.finish();
}
});
((ViewPager) container).addView(viewLayout);
return viewLayout;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((RelativeLayout) object);
}
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
return false;
}
}
公共类FullScreenImageAdapter扩展了PagerAdapter实现的OnTouchListener{
私人活动;
私有ArrayList_ImagePath;
私人充气机;
位图;
//建造师
公共FullScreenImageAdapter(活动活动,ArrayList ImagePath){
这个。_活动=活动;
这是。_imagepath=imagepath;
}
@凌驾
public int getCount(){
返回此项。_imagepath.size();
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图==((RelativeLayout)对象);
}
@凌驾
公共对象实例化项(视图组容器,int位置){
按钮关闭;
按钮btnEdit;
TouchImageView imgDisplay;
充气器=(LayoutInflater)\u activity.getSystemService(Context.LAYOUT\u充气器\u SERVICE);
视图布局=充气机。充气(R.layout.layout\u全屏图像,容器,错误);
imgDisplay=(TouchImageView)viewLayout.findViewById(R.id.imgDisplay);
imgDisplay.setOnTouchListener((OnTouchListener)this);
BitmapFactory.Options=new-BitmapFactory.Options();
options.inPreferredConfig=Bitmap.Config.ARGB_8888;
options.inSampleSize=8;
位图=位图工厂.decodeFile(_imagepath.get(位置),选项);
设置图像位图(位图);
btnClose=(按钮)viewLayout.findViewById(R.id.btnClose);
btnClose.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
_activity.finish();
}
});
((ViewPager)容器)。添加视图(viewLayout);
返回视图布局;
}
@凌驾
公共项(视图组容器、int位置、对象){
((ViewPager)容器)。移除视图((RelativeLayout)对象);
}
公共布尔onTouch(视图arg0、运动事件arg1){
//TODO自动生成的方法存根
返回false;
}
}
下面是TouchImageView代码
public class TouchImageView extends ImageView {
Matrix matrix;
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// Remember some things for zooming
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
ScaleGestureDetector mScaleDetector;
Context context;
public TouchImageView(Context context) {
super(context);
sharedConstructing(context);
}
public TouchImageView(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix = new Matrix();
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX, viewWidth,
origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY, viewHeight,
origHeight * saveScale);
matrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true; // indicate event was handled
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
private class ScaleListener extends
ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
if (origWidth * saveScale <= viewWidth
|| origHeight * saveScale <= viewHeight)
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2,
viewHeight / 2);
else
matrix.postScale(mScaleFactor, mScaleFactor,
detector.getFocusX(), detector.getFocusY());
fixTrans();
return true;
}
}
void fixTrans() {
matrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight
* saveScale);
if (fixTransX != 0 || fixTransY != 0)
matrix.postTranslate(fixTransX, fixTransY);
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescales image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0)
return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
// Fit to screen.
float scale;
Drawable drawable = getDrawable();
if (drawable == null || drawable.getIntrinsicWidth() == 0
|| drawable.getIntrinsicHeight() == 0)
return;
int bmWidth = drawable.getIntrinsicWidth();
int bmHeight = drawable.getIntrinsicHeight();
Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
// Center the image
float redundantYSpace = (float) viewHeight
- (scale * (float) bmHeight);
float redundantXSpace = (float) viewWidth
- (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix(matrix);
}
fixTrans();
}
}
公共类TouchImageView扩展了ImageView{
矩阵;
//我们可能处于这三种状态之一
静态最终int NONE=0;
静态最终整数阻力=1;
静态最终整数缩放=2;
int模式=无;
//记住一些关于缩放的事情
PointF last=新的PointF();
PointF start=新的PointF();
浮动最小刻度=1f;
浮点最大刻度=3f;
浮动[]m;
int viewWidth,viewHeight;
静态最终int CLICK=3;
浮动存储比例=1f;
受保护的浮子起始宽度、起始高度;
int oldMeasuredWidth,oldMeasuredHeight;
scalegestruedetector mScaleDetector;
语境;
公共TouchImageView(上下文){
超级(上下文);
共享构造(上下文);
}
公共TouchImageView(上下文、属性集属性){
超级(上下文,attrs);
共享构造(上下文);
}
私有void共享构造(上下文){
super.setClickable(true);
this.context=上下文;
mScaleDetector=新的scalegestruedetector(上下文,新的ScaleListener());
矩阵=新矩阵();
m=新浮点数[9];
setImageMatrix(矩阵);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(新的OnTouchListener(){
@凌驾
公共布尔onTouch(视图v,运动事件){
mScaleDetector.onTouchEvent(事件);
PointF curr=新的PointF(event.getX(),event.getY());
开关(event.getAction()){
case MotionEvent.ACTION\u DOWN:
最后一组(当前);
开始。设置(最后);
模式=拖动;
打破
case MotionEvent.ACTION\u移动:
如果(模式==拖动){
浮动deltaX=当前x-最后x;
浮动三角洲=当前y-最后y;
float Fixtranx=GetFixtragtrans(deltaX、viewWidth、,
原始宽度*保存比例);
float fixTransY=GetFixtragtrans(deltaY、viewHeight、,
origHeight*保存比例);
矩阵后翻译(fixtranx,fixtrany);
fixTrans();
最后一组(当前x、当前y);
Picasso.with(getActivity())
.load(path)
.resize(width, height)
.centerCrop()
.into(imageView);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.inSampleSize = 8;
bitmap = BitmapFactory.decodeFile(_imagePaths.get(position), options);
imgDisplay.setImageBitmap(bitmap);
aQuery.image(imgDisplay).id(_imagePaths.get(position),true,true);