构建像app这样的图像处理你可以用相机拍照，你可以添加剪贴画图像，胡须，眼镜等，我需要能够在视图周围拖动图像（relativeLayout）和那个工作正常，我无法实现的是缩放图像（其中3个），而不会闪烁代码。感谢你的帮助
gesture_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custome="http://schemas.android.com/apk/res/com.jimmy.test"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.jimmy.test.GestureTestActivity"
android:id="@+id/root">
<ImageView
android:id="@+id/robo1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:background="#ff0000"
android:scaleType="fitCenter"
/>
<ImageView
android:id="@+id/robo2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:background="#00ff00"
android:scaleType="fitCenter"
/>
<ImageView
android:id="@+id/robo3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:background="#0000ff"
android:scaleType="fitCenter"
/>
</RelativeLayout>
以及此处的活动代码
package com.jimmy.test;
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
public class GestureTestActivity extends Activity implements OnTouchListener {
private int _xDelta;
private int _yDelta;
private RelativeLayout _root;
private ImageView robo1, robo2, robo3;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.0f;
private ImageView curView;
private int width1, height1;
private int mActivePointerId;
private float mLastTouchX;
private float mLastTouchY;
// 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;
private static final String TAG = "Touch";
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gesture_layout);
_root = (RelativeLayout)findViewById(R.id.root);
robo1 = (ImageView) findViewById(R.id.robo1);
robo2 = (ImageView) findViewById(R.id.robo2);
robo3 = (ImageView) findViewById(R.id.robo3);
robo1.setOnTouchListener(this);
robo2.setOnTouchListener(this);
robo3.setOnTouchListener(this);
// Create our ScaleGestureDetector
mScaleDetector = new ScaleGestureDetector(this, new ScaleListener());
}
@Override
public void onWindowFocusChanged(boolean hasFocus){
width1 = robo1.getWidth();
height1 = robo1.getHeight();
}
@Override
public boolean onTouch(View view_, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
curView = (ImageView) view_;
mScaleDetector.onTouchEvent(event);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) curView.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
final float x = event.getX();
final float y = event.getY();
mLastTouchX = x;
mLastTouchY = y;
mActivePointerId = event.getPointerId(0);
break;
case MotionEvent.ACTION_UP:
mActivePointerId = -1;
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
final int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = event.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = event.getX(newPointerIndex);
mLastTouchY = event.getY(newPointerIndex);
mActivePointerId = event.getPointerId(newPointerIndex);
}
break;
case MotionEvent.ACTION_MOVE:
if (!mScaleDetector.isInProgress()) {
Log.d("scaling state ", "<<<<<<<<<NOT SCALING");
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) curView.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = -250;
layoutParams.bottomMargin = -250;
curView.setLayoutParams(layoutParams);
// _root.invalidate();
}else{
//Log.d("scaling state ", ">>>>>>>>>>>>>> SCALING");
}
break;
}
return true;
}
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);
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
curView.setScaleX(mScaleFactor);
curView.setScaleY(mScaleFactor);
_root.invalidate();
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
curView.setScaleX(mScaleFactor);
curView.setScaleY(mScaleFactor);
_root.invalidate();
super.onScaleEnd(detector);
}
}
}