Java 无法放大公交路线图
我有一张巴士路线图作为图像。 使用缩放控制器,图像将缩小,但不会放大 请查看我的代码,并让我知道要做的更改,使其正常工作。。 我正在姜饼上开发我的应用程序,即API 10Java 无法放大公交路线图,java,android,android-layout,android-intent,android-widget,Java,Android,Android Layout,Android Intent,Android Widget,我有一张巴士路线图作为图像。 使用缩放控制器,图像将缩小,但不会放大 请查看我的代码,并让我知道要做的更改,使其正常工作。。 我正在姜饼上开发我的应用程序,即API 10 import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.ImageView; import android.widget.Re
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.ZoomControls;
public class Busmaps extends Activity {
ImageView img;
ZoomControls zoom;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.busmaps);
img = (ImageView) findViewById(R.id.imageViewmaps1);
zoom = (ZoomControls) findViewById(R.id.zoomControls1);
zoom.setOnZoomInClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int w = img.getWidth();
int h = img.getHeight();
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(w + 50, h + 50);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
img.setLayoutParams(params);
}
});
zoom.setOnZoomOutClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int w = img.getWidth();
int h = img.getHeight();
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(w - 50, h - 50);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
img.setLayoutParams(params);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.bus_map_zoom, menu);
return true;
}
}
我的xml表示公交路线图像:-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageViewmaps1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/map" />
<ZoomControls
android:id="@+id/zoomControls1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
如何使我的缩放控制同时适用于放大和缩小。请用以下内容替换您的放大和缩小侦听器:
zoom.setOnZoomInClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
float x = img.getScaleX();
float y = img.getScaleY();
img.setScaleX((float) (x+1));
img.setScaleY((float) (y+1));
}
});
zoom.setOnZoomOutClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
float x = img.getScaleX();
float y = img.getScaleY();
img.setScaleX((float) (x-1));
img.setScaleY((float) (y-1));
}
});
}
另一种选择是在具有内置缩放控制器的Web视图中加载图像
详情如下:
String page = "<html><body><center><img src=\""+path to your image+"\"/></center></body></html>";
webView.loadDataWithBaseURL("fake",page, "text/html", "UTF-8","");
webView.setInitialScale(ZOOM_LEVEL);
公共类Busmap扩展了活动实现OnTouchListener
{
私有静态最终字符串TAG=“Touch”;
@抑制警告(“未使用”)
专用静态最终浮动最小缩放=1f,最大缩放=1f;
//这些矩阵将用于缩放图像的点
矩阵=新矩阵();
矩阵savedMatrix=新矩阵();
//用户试图执行的3个状态(事件)
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;
//这些PointF对象用于记录用户触摸的点
PointF start=新的PointF();
PointF mid=新的PointF();
浮动oldDist=1f;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.busmaps);
ImageView=(ImageView)findViewById(R.id.imageViewmaps1);
view.setOnTouchListener(这个);
}
@凌驾
公共布尔onTouch(视图v,运动事件)
{
ImageView视图=(ImageView)v;
view.setScaleType(ImageView.ScaleType.MATRIX);
浮标;
dumpEvent(事件);
//在这里处理触摸事件。。。
开关(event.getAction()&MotionEvent.ACTION\u掩码)
{
case MotionEvent.ACTION_DOWN://仅首指向下
savedMatrix.set(矩阵);
set(event.getX(),event.getY());
Log.d(标记,“mode=DRAG”);//写入LogCat
模式=拖动;
打破
case MotionEvent.ACTION_UP://举起第一个手指
case MotionEvent.ACTION\u POINTER\u UP://举起食指
模式=无;
Log.d(标记“mode=NONE”);
打破
case MotionEvent.ACTION\u POINTER\u DOWN://第一个和第二个手指向下
oldDist=间距(事件);
Log.d(标记“oldDist=“+oldDist”);
如果(旧区>5f){
savedMatrix.set(矩阵);
中点(中点,事件);
模式=缩放;
Log.d(标记“mode=ZOOM”);
}
打破
case MotionEvent.ACTION\u移动:
如果(模式==拖动)
{
矩阵集(savedMatrix);
postTranslate(event.getX()-start.x,event.getY()-start.y);//在点矩阵中创建转换
}
else if(模式==缩放)
{
//收缩变焦
float newDist=间距(事件);
Log.d(标记“newDist=“+newDist”);
如果(新距离>5f)
{
矩阵集(savedMatrix);
scale=newDist/oldDist;//设置
//矩阵…如果比例>1表示
//放大…如果比例小于1表示
//缩小
矩阵。后标度(标度、标度、中x、中y);
}
}
打破
}
view.setImageMatrix(矩阵);//在屏幕上显示转换
返回true;//指示事件已处理
}
专用浮动间距(MotionEvent事件)
{
float x=event.getX(0)-event.getX(1);
float y=event.getY(0)-event.getY(1);
返回FloatMath.sqrt(x*x+y*y);
}
专用空心中点(点F点、MotionEvent事件)
{
float x=event.getX(0)+event.getX(1);
float y=event.getY(0)+event.getY(1);
点集(x/2,y/2);
}
getScaleX/Y()我正在姜饼上开发我的应用程序,即API 10。你能帮我找到其他解决方案吗?请检查我编辑了我的答案,看它是否对你有效我的代码正在工作,我只想知道为什么它只缩放一次,而不进一步缩放…我需要定义一些边框/像素还是我遗漏了什么方法…我想请你再次检查我的代码,让我知道是否有任何像屏幕大小或图像大小这样的东西需要定义,因为我无法进一步缩放。。。
public class Busmap extends Activity implements OnTouchListener
{
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f;
// These matrices will be used to scale points of the image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// The 3 states (events) which the user is trying to perform
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.busmaps);
ImageView view = (ImageView) findViewById(R.id.imageViewmaps1);
view.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN: // first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG"); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 5f) {
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); // create the transformation in the matrix of points
}
else if (mode == ZOOM)
{
// pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f)
{
matrix.set(savedMatrix);
scale = newDist / oldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix); // display the transformation on screen
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);
}