我有imageView。我需要使用pinch for imageView。我提到了一些文件。但是一切都使用了doubleTap。使用doubleTap zoomIn和ZoomOut时。我不想要双击放大和缩小。我需要用手指捏。我使用OnTouch进行imageView移动。
代码：
触摸课程：
package com.example.blogactivity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class Touch implements OnTouchListener{
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new 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 start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
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);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event) {
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid ").append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
}
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);
}
}
MainActivity：
package com.example.blogactivity;
import com.example.blogactivity.*;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageView;
public class BlogActivity extends Activity {
ImageView image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_blog);
image=(ImageView)findViewById(R.id.imageView);
image.setOnTouchListener(new Touch());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.blog, menu);
return true;
}
}
的xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".BlogActivity" >
<ImageView android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/butterfly"
android:scaleType="matrix"
android:adjustViewBounds="true"
android:layout_gravity="center" />
</RelativeLayout>
答案 0 :(得分：0)
我的代码将link中的“活动”和“触摸”组合在一起，它可以正常运行。拖动/缩放ImageView。
这是一个简短的版本，我认为只有内容代码相关
public class MainActivity extends Activity implements OnTouchListener
{
ImageView viewmap;
@Override
public void onCreate(Bundle savedInstanceState) {
viewmap = (ImageView) findViewById(R.id.image);
viewmap.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
viewmap = (ImageView) v;
viewmap.setScaleType(ImageView.ScaleType.MATRIX);
dumpEvent(event);
// Handle touch events here...
viewmap.setImageMatrix(matrix); // display the transformation on screen
return true;
}
Edit3：xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="matrix"
android:src="@drawable/image" />
</RelativeLayout>
答案 1 :(得分：0)
我使用imagezoom.jar，这对我有用。
步骤是：
在xml文件中，替换普通的＆＃39; imageview＆＃39;与＆＃39; com.theappguruz.imagezoom.ImageViewTouch＆＃39;
System.out.println(Math.incrementExact(2_147_483_647 + 1));
获取图像位图。
然后在onCreate（）方法的活动中，使用以下方法重置图像位图：
imgView.setImageBitmapReset（bmp，0，true）;