我使用画布在大图像上绘制了一个标记图像，该图像也是由画布绘制的，但是当我滚动图像时，标记图像不会像Google地图一样同时移动图像。它有什么解决方案吗？
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/table"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:contentDescription="hello" />
</ScrollView>
</HorizontalScrollView>
ImageViewFromURLActivity.java
package com.example.image;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.ImageView;
public class ImageViewFromURLActivity extends Activity {
private static int displayWidth = 0;
private static int displayHeight = 0;
public static final String URL = "http://goo.gl/plT1wB";
static float mX=100;
static float mY=200;
ImageView imageView;
static Bitmap abc = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create an object for subclass of AsyncTask
GetXMLTask task = new GetXMLTask();
// Execute the task
task.execute(new String[] { URL });
}
private class GetXMLTask extends AsyncTask<String, Void, Bitmap> {
ProgressDialog dialog = new ProgressDialog(
ImageViewFromURLActivity.this);
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
dialog.show();
dialog.setMessage("Please Wait...");
dialog.setCancelable(false);
}
@Override
protected Bitmap doInBackground(String... urls) {
Bitmap map = null;
for (String url : urls) {
map = downloadImage(url);
}
return map;
}
// Sets the Bitmap returned by doInBackground
@Override
protected void onPostExecute(Bitmap result) {
// imageView.setImageBitmap(result);
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
displayWidth = display.getWidth();
displayHeight = display.getHeight();
System.out.println(displayHeight + "==Height");
System.out.println(displayWidth + "==width");
abc = result;
// SampleView constructor must be constructed last as it needs the
// displayWidth and displayHeight we just got.
dialog.dismiss();
setContentView(new SampleView(ImageViewFromURLActivity.this));
}
// Creates Bitmap from InputStream and returns it
private Bitmap downloadImage(String url) {
Bitmap bitmap = null;
InputStream stream = null;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
try {
stream = getHttpConnection(url);
bitmap = BitmapFactory.decodeStream(stream, null, bmOptions);
stream.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return bitmap;
}
// Makes HttpURLConnection and returns InputStream
private InputStream getHttpConnection(String urlString)
throws IOException {
InputStream stream = null;
URL url = new URL(urlString);
URLConnection connection = url.openConnection();
try {
HttpURLConnection httpConnection = (HttpURLConnection) connection;
httpConnection.setRequestMethod("GET");
httpConnection.connect();
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
stream = httpConnection.getInputStream();
}
} catch (Exception ex) {
ex.printStackTrace();
}
return stream;
}
}
private static class SampleView extends View {
private static Bitmap bmLargeImage; // bitmap large enough to be
// scrolled
private static Rect displayRect = null; // rect we display to
private Rect scrollRect = null; // rect we scroll over our bitmap
private int scrollRectX = 0; // current left location of scroll rect
private int scrollRectY = 0; // current top location of scroll rect
private float scrollByX = 0; // x amount to scroll by
private float scrollByY = 0; // y amount to scroll by
private float startX = 0; // track x from one ACTION_MOVE to the
// next
private float startY = 0; // track y from one ACTION_MOVE to the
Bitmap largeIcon= BitmapFactory.decodeResource(getResources(), R.drawable.marker);
// next
public SampleView(Context context) {
super(context);
// Destination rect for our main canvas draw. It never changes.
displayRect = new Rect(0, 0, displayWidth, displayHeight);
// Scroll rect: this will be used to 'scroll around' over the
// bitmap in memory. Initialize as above.
scrollRect = new Rect(0, 0, displayWidth, displayHeight);
// Load a large bitmap into an offscreen area of memory.
bmLargeImage = abc;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// Remember our initial down event location.
startX = event.getRawX();
startY = event.getRawY();
System.out.println("move action_Start X==" + startX);
System.out.println(" move action_Start Y==" + startY);
break;
case MotionEvent.ACTION_MOVE:
float x = event.getRawX();
float y = event.getRawY();
System.out.println("float x......"+x);
System.out.println("float y......"+y);
// Calculate move update. This will happen many times
// during the course of a single movement gesture.
scrollByX = x - startX; // move update x increment
System.out.println("start X....."+startX);
System.out.println("scroll by X= float x - startX=====" + scrollByX);
System.out.println("......................");
scrollByY = y - startY; // move update y increment
System.out.println("start Y....."+startY);
System.out.println("scroll by Y= float y - startY=====" + scrollByY);
startX = x; // reset initial values to latest
startY = y;
invalidate(); // force a redraw
break;
}
return true; // done with this event so consume it
}
@Override
protected void onDraw(Canvas canvas) {
int newScrollRectX = scrollRectX - (int) scrollByX;
int newScrollRectY = scrollRectY - (int) scrollByY;
// Don't scroll off the left or right edges of the bitmap.
if (newScrollRectX < 0)
newScrollRectX = 0;
else if (newScrollRectX > (bmLargeImage.getWidth() - displayWidth))
newScrollRectX = (bmLargeImage.getWidth() - displayWidth);
// Don't scroll off the top or bottom edges of the bitmap.
if (newScrollRectY < 0)
newScrollRectY = 0;
else if (newScrollRectY > (bmLargeImage.getHeight() - displayHeight))
newScrollRectY = (bmLargeImage.getHeight() - displayHeight);
// We have our updated scroll rect coordinates, set them and
// draw.
scrollRect.set(newScrollRectX, newScrollRectY, newScrollRectX + displayWidth, newScrollRectY + displayHeight);
Paint paint = new Paint();
canvas.drawBitmap(bmLargeImage, scrollRect, displayRect, paint);
scrollRectX = newScrollRectX;
scrollRectY = newScrollRectY;
canvas.drawBitmap(largeIcon,mX,mY,null);
}
}
}
o/p: http://i.imgur.com/c3vapIm.png?1