Android：如何在 android 中对两个图像视图执行缩放？答案

【问题标题】：Android: How to perform zoom on two imageviews in android?Android：如何在 android 中对两个图像视图执行缩放？
【发布时间】：2012-04-20 06:49:03
【问题描述】：

我的布局中有两张图片。我需要放大我触摸的那个图像。我们知道 Frame 一次只能显示一个视图。那么如何分别对每个图像视图执行缩放？我的 xml 文件：

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
  android:src="@drawable/image1" />

  <ImageView
    android:id="@+id/imageView2"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"   android:src="@drawable/image2"

  />

</FrameLayout>

活动文件：

public class MyActivity extends Activity implements OnTouchListener
{
private static final String TAG = "Touch";

// 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;

private ImageView iv1;
private ImageView iv2;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);


    iv1 = ((ImageView)findViewById(R.id.imageView1));
    iv1.setOnTouchListener(this);


    iv2 = ((ImageView)findViewById(R.id.imageView2));
    iv2.setOnTouchListener(this);



}
@Override
public boolean onTouch(View v, MotionEvent event) {
    switch (v.getId()) {
    case R.id.imageView1:
        zoomImageView(v, event);
        break;
    case R.id.imageView2:
        zoomImageView(v, event);
        break;

    default:
        break;
    }
    return true;
}
private boolean zoomImageView(View v, MotionEvent event) {


    ImageView view = (ImageView) v;
    view.setScaleType(ImageView.ScaleType.MATRIX);
    float scale;


    switch (event.getAction() & 255) 
    {
    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 6: // second finger lifted

        mode = NONE;
        Log.d(TAG, "mode=NONE");
        break;

    case 5: // 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);
}

/*
 * --------------------------------------------------------------------------
 * Method: midPoint Parameters: PointF object, MotionEvent Returns: void
 * Description: calculates the midpoint between the two fingers
 * ------------------------------------------------------------
 */

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);
}
 }

现在我只能缩放顶部的 image1。如何在触摸 image2 时获得底部图像的缩放功能？我应该能够缩放我触摸的图像。请帮帮我。

【问题讨论】：

嘿，Rahul，你找到任何解决方案了吗？？？
sorry anshuman dint 得到任何答案。仍然在尝试。如果你有任何 plz infrm me thnks ..
@Tech.Rahul 你得到你的解决方案了吗，你知道我们如何为ImageView的画布应用捏拉放大。我正在寻找我的问题stackoverflow.com/q/10482229/596725的答案
抱歉，Rahul，我现在对您的问题一无所知。
没问题@Anshuman .. 你的问题解决了吗？

标签： android imageview zooming android-framelayout

【解决方案1】：

您可以使用 LinearLayout 并将它们水平或垂直对齐，这样您将拥有两个相互独立的图像视图然后使用 gestureimageview 支持平移缩放和双击查看下面的链接....

希望这能回答你的问题：D

点击here！

https://github.com/jasonpolites/gesture-imageview

【讨论】：

【解决方案2】：

使用 ZoomageView 代替 ImageView。

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<com.jsibbold.zoomage.ZoomageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:src="@drawable/image1" />

<com.jsibbold.zoomage.ZoomageView
        android:id="@+id/imageView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:src="@drawable/image2" />

</FrameLayout>

添加依赖：

implementation 'com.jsibbold:zoomage:1.1.0'

希望这会对你有所帮助。

【讨论】：