在我的程序中，我可以在屏幕上移动图像吗？有时我会从网站上丢失它并且找不到它。我希望添加将图像放置在原始位置的功能。我自己的方法不起作用（以及与之相关的问题以使其起作用）：
ImageView iv = current;
Matrix matrix = iv.getImageMatrix;
float[] values = new float[9];
matrix.getValues(values);
int a = values[Matrix.MTRANS_X];
int b = values[Matrix.MTRANS_Y];
matrix.postTranslate(-a,-b);
iv.setImageMatrix(matrix);
编辑：最新代码
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.ExecutionException;
import ua.mirkvartir.android.frontend.UILApplication;
import android.app.Activity;
import android.app.Fragment;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.view.MotionEventCompat;
import android.util.FloatMath;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ImageShowActivity extends Activity {
int p = 0;
Activity app;
ImageAdapterr ia;
ImageView imView;
int imgPos = 0;
Bitmap bm = null;
int geg = 90;
public int width = 0;
public int hight = 0;
Gallery gallery;
Matrix matrix = new Matrix();
Matrix shift = new Matrix();
private int INVALID_POINTER_ID = -1;
private int mActivePointerId = INVALID_POINTER_ID;
private ScaleGestureDetector mScaleDetector;
private float mLastTouchX = 0;
private float mLastTouchY = 0;
private float mPosX = 0;
private float mPosY = 0;
ImageView current;
public List<ImageView> images;
public int reset = 0;
HashMap<Integer, Bitmap> map = new HashMap<Integer, Bitmap>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_show);
app = this;
images = new ArrayList<ImageView>(
UILApplication.photo_buffer_big.size());
Log.d("images", UILApplication.photo_buffer_big.size() + "");
Log.d("images", images.size() + "");
gallery = (Gallery) findViewById(R.id.gallery);
// EDGES ARE INVISIBLE
gallery.setHorizontalFadingEdgeEnabled(false);
ia = new ImageAdapterr(this);
gallery.setAdapter(ia);
final int length = UILApplication.photo_buffer_big.size();
Button back_btn = (Button) findViewById(R.id.analitics_back_btn);
back_btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
finish();
}
});
final TextView img_counter_tv = (TextView) findViewById(R.id.img_counter);
img_counter_tv.setText(p + 1 + "/" + length);
Button nextButton = (Button) findViewById(R.id.next_btn);
nextButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (p < length - 1) {
p++;
} else {
p = 0;
}
gallery.setSelection(p, true);
img_counter_tv.setText(p + 1 + "/" + length);
}
});
Button backButton = (Button) findViewById(R.id.back_btn);
backButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (p == 0) {
p = length - 1;
} else {
p--;
}
gallery.setSelection(p, true);
img_counter_tv.setText(p + 1 + "/" + length);
}
});
}
public void rotateS(View v) {
ImageView iv = current;
Bitmap b = ((BitmapDrawable) iv.getDrawable()).getBitmap();
Matrix matrix = new Matrix();
matrix.postRotate(geg);
Bitmap bMapRotate = Bitmap.createBitmap(b, 0, 0, b.getWidth(),
b.getHeight(), matrix, true);
iv.setImageBitmap(bMapRotate);
}
public void extendS(View v) {
reset = 1;
Log.d("restart", "yes");
runOnUiThread(new Runnable() {
public void run() {
View viewToUpdate = gallery.getChildAt(p - gallery.getFirstVisiblePosition());
viewToUpdate.invalidate();
// ia.notifyDataSetChanged();
}
});
}
public static Bitmap resizeBitmap(Bitmap photo, float x, float y) {
try {
// get current bitmap width and height
int width = photo.getWidth();
int height = photo.getHeight();
// determine how much to scale
float scaleWidth = x / width;
float scaleHeight = y / height;
Log.d("aspect3", "w: " + scaleWidth + " h: " + scaleHeight);
// create the matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bitmap
matrix.postScale(scaleWidth, scaleHeight);
// recreate the new bitmap
Bitmap resizebitmap = Bitmap.createBitmap(photo, 0, 0, width,
height, matrix, false);
return resizebitmap;
} catch (NullPointerException e) {
e.printStackTrace();
} catch (OutOfMemoryError e) {
e.printStackTrace();
System.gc();
}
return null;
}
class ImageAdapterr extends BaseAdapter {
/** The parent context */
private Context myContext;
/** Simple Constructor saving the 'parent' context. */
public ImageAdapterr(Context c) {
this.myContext = c;
}
Matrix savedMatrix = new Matrix();
/** Returns the amount of images we have defined. */
public int getCount() {
return UILApplication.photo_buffer_big.size();
}
/* Use the array-Positions as unique IDs */
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
/**
* Returns a new ImageView to be displayed, depending on the position
* passed.
*/
public View getView(final int position, View convertView,
ViewGroup parent) {
ImageView imView = new ImageView(this.myContext);
current = imView;
imgPos = position;
if (bm==null){
AsyncLoad imLoad = new AsyncLoad();
imLoad.execute();
try {
bm = imLoad.get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (bm != null) {
imView.setImageBitmap(bm);
} else if (bm == null) {
imView.setImageResource(R.drawable.logo);
}
/* Image should be scaled as width/height are set. */
imView.setScaleType(ImageView.ScaleType.FIT_CENTER);
/* Set the Width/Height of the ImageView. */
imView.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
imView.setOnTouchListener(new OnTouchListener() {
private static final String TAG = "Touch";
// These matrices will be used to move and zoom image
PointF start = new PointF();
public PointF mid = new PointF();
// We can be in one of these 3 states
public static final int NONE = 0;
public static final int DRAG = 1;
public static final int ZOOM = 2;
public int mode = NONE;
float oldDist;
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x,
event.getY() - start.y);
} else if (mode == ZOOM) {
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
}
// Perform the transformation
Log.d("point",
(event.getX() - start.x) + " "
+ (event.getY() - start.y));
// Log.d("point",start.x +" "+start.y);
float[] values = new float[9];
matrix.getValues(values);
float a = values[Matrix.MTRANS_X];
float b = values[Matrix.MTRANS_Y];
Log.d("touch matrix", values[Matrix.MPERSP_0] + " "
+ values[Matrix.MPERSP_1] + " "
+ values[Matrix.MPERSP_2]);
Log.d("touch matrix scale", values[Matrix.MSCALE_X] + " "
+ values[Matrix.MSCALE_Y]);
Log.d("touch matrix scew", values[Matrix.MSKEW_X] + " "
+ values[Matrix.MSKEW_Y]);
Log.d("touch matrix trans", values[Matrix.MTRANS_X] + " "
+ values[Matrix.MTRANS_Y]);
if (reset == 1) {
matrix.reset();
savedMatrix.reset();
}
view.setImageMatrix(matrix);
reset = 0;
// images.set(position, view);
return true; // indicate event was handled
}
private float spacing(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 midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
});
return imView;
}
/**
* Returns the size (0.0f to 1.0f) of the views depending on the
* 'offset' to the center.
*/
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
}
}
class AsyncLoad extends AsyncTask<Void, Void, Bitmap> {
ProgressDialog pd;
@Override
protected void onPreExecute() {
pd = new ProgressDialog(app);
pd.setOwnerActivity(app);
pd.setTitle("Идет загрузка...");
pd.setCancelable(true);
pd.show();
}
@Override
protected Bitmap doInBackground(Void... arg0) {
// TODO Auto-generated method stub
try {
/*
* Open a new URL and get the InputStream to load data from it.
*/
URL aURL = new URL(UILApplication.photo_buffer_big.get(imgPos));
URLConnection conn = aURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
/* Buffered is always good for a performance plus. */
BufferedInputStream bis = new BufferedInputStream(is);
/* Decode url-data to a bitmap. */
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
/* Apply the Bitmap to the ImageView that will be returned. */
// imView.setImageBitmap(bm);
} catch (IOException e) {
// imView.setImageResource(R.drawable.logo);
bm = null;
Log.e("DEBUGTAG", "Remote Image Exception", e);
}
map.put(imgPos, bm);
Log.d("map", map.size() + "");
return bm;
}
@Override
protected void onPostExecute(Bitmap arg0) {
pd.dismiss();
}
}
}
XML
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/top_tab_bg"
android:padding="10dp" >
<Button
android:id="@+id/analitics_back_btn"
style="@style/ButtonText"
android:layout_marginRight="5dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/back_btn"
android:background="@drawable/btn_clk_selector"
android:text="Назад" />
<Button
android:id="@+id/btn_rotate"
style="@style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dip"
android:layout_toLeftOf="@+id/analitics_back_btn"
android:background="@drawable/btn_clk_selector"
android:onClick="rotateS"
android:text="Повернуть" />
<Button
android:id="@+id/btn_ex"
style="@style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dip"
android:layout_toLeftOf="@+id/btn_rotate"
android:background="@drawable/btn_clk_selector"
android:onClick="extendS"
android:text="рас" />
<Button
android:id="@+id/next_btn"
style="@style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="5dp"
android:background="@drawable/next_img_btn"
android:paddingRight="10dp" />
<TextView
android:id="@+id/img_counter"
style="@style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/next_btn"
android:text="1/10" />
<Button
android:id="@+id/back_btn"
style="@style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:layout_toLeftOf="@+id/img_counter"
android:background="@drawable/back_img_btn" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/gal"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Gallery
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/gallery"
android:adjustViewBounds="true"
android:spacing="10dp"
/>
</RelativeLayout>
</LinearLayout>
编辑：新代码的问题 - 调用放大后图像没有休息。它在屏幕上的放大呼叫 + 选项卡后重置。图像也被部分重置 - 它会恢复到原始位置和比例，但会恢复到原始分辨率。所以通常我 bacamos 比屏幕小得多，而我需要它来填充屏幕。