缩放和平移ImageView Android oncreate致电

Question

我知道它有点旧的帖子，但任何帮助将非常感激。我试图调用这个类 “MyImageView” 这里是布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    tools:context=".MainScreen" > 
    <ImageView android:id="@+id/imageView1" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:contentDescription="@string/map" 
     android:scaleType="matrix" 
     android:src="@drawable/map" /> 
</RelativeLayout> 

这里是的onCreate：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_mainscreen); 

    final ImageView imageView = (ImageView) findViewById(R.id.imageView1); 

    Resources resource = this.getResources(); 
    XmlPullParser parser = resource.getXml(R.layout.activity_mainscreen); 
    AttributeSet attributes = Xml.asAttributeSet(parser); 

    final MyImageView miv = new MyImageView(this, attributes); 

    imageView.setOnTouchListener(new OnTouchListener() { 
     @Override 
     public boolean onTouch(final View view, final MotionEvent event) { 
      return miv.onTouchEvent(event); 
     } 
    }); 

} 

这里是链接的ORIGINALE后：

Zoom and Panning ImageView Android

并没有缩放或平移，请我还是新来的这么赦免我的无知。

Answer 1

如果您想要一个平移和缩放侦听器。

请按照此代码。

从您的代码中删除imageView.setOnTouchListener。

，并添加我的代码

final ImageView imageView = (ImageView) findViewById(R.id.imageView1); 

imageView.setOnTouchListener(new Touch()); 

Bitmap map=BitmapFactory.decodeResource(getResources(), R.drawable.map); 

imageView.setImageBitmap(map); 

现在在项目中创建并命名一个新的类是“触摸”

写在触摸类

package com.forlo.photo; 

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 
public static Matrix matrix = new Matrix(); 
public static 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("]"); 
} 

/** Determine the space between the first two fingers */ 
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); 
} 

/** Calculate the mid point of the first 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); 
} 
} 

，并更改以下的布局到此

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
tools:context=".MainScreen" > 
<ImageView android:id="@+id/imageView1" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:contentDescription="@string/map" 
    android:scaleType="matrix"/> 
</RelativeLayout> 

现在告诉我，如果平移和缩放工作..