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Android实现图片随手指旋转功能

2013-10-28 16:53 405 查看
在View中进行重绘，主要是通过计算角度及距离来实现。实现类代码如下：

[java]

package com.example.roatedemo;

import java.util.Calendar;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

public class RotateView extends View {

private Paint mPaint = new Paint();

private Bitmap bitmaplittele;//中间不动的图片

private Bitmap bitmapBig;//随手指转动的图片

private Bitmap bitmapOut;//外围不动的图片

// 圆心坐标

private float mPointX = 0, mPointY = 0;
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private int flag = 0;
// 半径
private int mRadius = 0;
// 旋转角度
private int mAngle = 0;
private int beginAngle = 0, currentAngle = 0;
private String TAG = "NewView";
int bitMap[] = { R.drawable.circle0, R.drawable.circle1, R.drawable.circle2 };
int imageIndex = 0;
boolean isUp = false,isTouch=false;
Context mContext;
RotateViewListener listener;
long beginTime,endTime;
Calendar now;

public RotateView(Context context, int px, int py, int radius,RotateViewListener listener) {
super(context);
mContext = context;
this.listener = listener;
mPointX = px;
mPointY = py;
mRadius = radius;
bitmaplittele = BitmapFactory.decodeResource(getResources(),
R.drawable.a1_pointer).copy(Bitmap.Config.ARGB_8888, true);
bitmapBig = BitmapFactory.decodeResource(getResources(), bitMap[0])
.copy(Bitmap.Config.ARGB_8888, true);
bitmapOut = BitmapFactory.decodeResource(getResources(),
R.drawable.bigcir).copy(Bitmap.Config.ARGB_8888, true);
setBackgroundResource(R.drawable.back);
Log.e(TAG, "RotateViewBegin");
}

@Override
public boolean dispatchTouchEvent(MotionEvent e) {
switch (e.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
now = Calendar.getInstance();
beginTime = now.getTimeInMillis();
beginAngle = computeCurrentAngle(e.getX(), e.getY());
isUp = false;
//如果点击触摸范围在圈外，则不处理
if (getDistance(e.getX(), e.getY())>bitmapOut.getWidth()/2) {
isTouch=false;
}else {
isTouch=true;
}
return true;
case MotionEvent.ACTION_MOVE:
if (!isTouch) {
return true;
}
currentAngle = computeCurrentAngle(e.getX(), e.getY());
invalidate();
return true;
case MotionEvent.ACTION_UP:
isUp = true;
if (!isTouch) {
return true;
}
now = Calendar.getInstance();
endTime = now.getTimeInMillis();
if (SetClick(e.getX(), e.getY())) {
return true;
}
if (mAngle > 0) {
int count = mAngle / 120 + (mAngle % 120 > 60 ? 1 : 0);
imageIndex = (imageIndex + count) % 3;
} else if (mAngle < 0) {
mAngle = -mAngle;
int count = mAngle / 120 + (mAngle % 120 > 60 ? 1 : 0);
imageIndex = (imageIndex + 3 - count) % 3;
}
bitmapBig = BitmapFactory.decodeResource(getResources(),
bitMap[imageIndex]).copy(Bitmap.Config.ARGB_8888, true);
bitmapBig = adjustPhotoRotation(bitmapBig, imageIndex * 120);
invalidate();
if (mAngle >= 60) {
listener.onModChange(imageIndex);
}
return true;
}

return false;
}

@Override
public void onDraw(Canvas canvas) {
// Log.i(TAG, "onDraw");
// 大圆
drawInCenter(canvas, bitmapOut, mPointX, mPointY, TAG);
// 外圈
if (isUp) {
mAngle = 0;
} else {
mAngle = currentAngle - beginAngle;
}

Bitmap tempBig = adjustPhotoRotation(bitmapBig, mAngle);
// Log.i(TAG, "mAngle:"+mAngle);
drawInCenter(canvas, tempBig, mPointX, mPointY + 10, TAG);
// 小圆(中间的圆心)
drawInCenter(canvas, bitmaplittele, mPointX, mPointY - 10, TAG);
}

Bitmap adjustPhotoRotation(Bitmap bm, final int orientationDegree) {
if (orientationDegree == 0) {
return bm;
}
Matrix m = new Matrix();
m.setRotate(orientationDegree, (float) bm.getWidth() / 2,
(float) bm.getHeight() / 2);

try {
Bitmap bm1 = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
bm.getHeight(), m, true);

return bm1;

} catch (OutOfMemoryError ex) {
}

return null;

}

private void drawInCenter(Canvas canvas, Bitmap bitmap, float left,
float top, String text) {
canvas.drawBitmap(bitmap, left - bitmap.getWidth() / 2,
top - bitmap.getHeight() / 2, null);
}

// 子控件位置改变重新计算角度
private int computeCurrentAngle(float x, float y) {
// 根据圆心坐标计算角度
float distance = (float) Math
.sqrt(((x - mPointX) * (x - mPointX) + (y - mPointY)
* (y - mPointY)));
int degree = (int) (Math.acos((x - mPointX) / distance) * 180 / Math.PI);
if (y < mPointY) {
degree = -degree;
}
if (degree < 0) {
degree += 360;
}

// Log.i("RoundSpinView", "x:" + x + ",y:" + y + ",degree:" + degree);
return degree;
}

// 获取距离圆心的距离
private float getDistance(float x, float y) {
// 根据圆心坐标计算角度
float distance = (float) Math
.sqrt(((x - mPointX) * (x - mPointX) + (y - mPointY)
* (y - mPointY)));
return distance;
}

//点击
private boolean SetClick(float x, float y) {
float distance = getDistance(x, y);
if (mAngle>10||mAngle<-10) {
return false;
}else if(endTime-beginTime>1000){
return false;
}
if (distance < bitmapBig.getWidth() / 2) {
int mod = 0;

if (beginAngle < 90 || 330 < beginAngle) {
mod = (imageIndex+3-1)%3;
}
else if (90 < beginAngle && 210 > beginAngle) {
mod = (imageIndex+3-2)%3;
}
else{
mod = imageIndex;
}
//回调到主界面进行处理。
listener.onModClick(mod);
}
return true;
}

public interface RotateViewListener {
void onModClick(int mode);
void onModChange(int mode);
}


}

package com.example.roatedemo;

import java.util.Calendar;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

public class RotateView extends View {

private Paint mPaint = new Paint();

private Bitmap bitmaplittele;//中间不动的图片

private Bitmap bitmapBig;//随手指转动的图片

private Bitmap bitmapOut;//外围不动的图片

// 圆心坐标

private float mPointX = 0, mPointY = 0;

private int flag = 0;

// 半径

private int mRadius = 0;

// 旋转角度

private int mAngle = 0;

private int beginAngle = 0, currentAngle = 0;

private String TAG = "NewView";

int bitMap[] = { R.drawable.circle0, R.drawable.circle1, R.drawable.circle2 };

int imageIndex = 0;

boolean isUp = false,isTouch=false;

Context mContext;

RotateViewListener listener;

long beginTime,endTime;

Calendar now;

public RotateView(Context context, int px, int py, int radius,RotateViewListener listener) {

super(context);

mContext = context;

this.listener = listener;

mPointX = px;

mPointY = py;

mRadius = radius;

bitmaplittele = BitmapFactory.decodeResource(getResources(),

R.drawable.a1_pointer).copy(Bitmap.Config.ARGB_8888, true);

bitmapBig = BitmapFactory.decodeResource(getResources(), bitMap[0])

.copy(Bitmap.Config.ARGB_8888, true);

bitmapOut = BitmapFactory.decodeResource(getResources(),

R.drawable.bigcir).copy(Bitmap.Config.ARGB_8888, true);

setBackgroundResource(R.drawable.back);

Log.e(TAG, "RotateViewBegin");

}

@Override

public boolean dispatchTouchEvent(MotionEvent e) {

switch (e.getAction() & MotionEvent.ACTION_MASK) {

case MotionEvent.ACTION_DOWN:

now = Calendar.getInstance();

beginTime = now.getTimeInMillis();

beginAngle = computeCurrentAngle(e.getX(), e.getY());

isUp = false;

//如果点击触摸范围在圈外，则不处理

if (getDistance(e.getX(), e.getY())>bitmapOut.getWidth()/2) {

isTouch=false;

}else {

isTouch=true;

}

return true;

case MotionEvent.ACTION_MOVE:

if (!isTouch) {

return true;

}

currentAngle = computeCurrentAngle(e.getX(), e.getY());

invalidate();

return true;

case MotionEvent.ACTION_UP:

isUp = true;

if (!isTouch) {

return true;

}

now = Calendar.getInstance();

endTime = now.getTimeInMillis();

if (SetClick(e.getX(), e.getY())) {

return true;

}

if (mAngle > 0) {

int count = mAngle / 120 + (mAngle % 120 > 60 ? 1 : 0);

imageIndex = (imageIndex + count) % 3;

} else if (mAngle < 0) {

mAngle = -mAngle;

int count = mAngle / 120 + (mAngle % 120 > 60 ? 1 : 0);

imageIndex = (imageIndex + 3 - count) % 3;

}

bitmapBig = BitmapFactory.decodeResource(getResources(),

bitMap[imageIndex]).copy(Bitmap.Config.ARGB_8888, true);

bitmapBig = adjustPhotoRotation(bitmapBig, imageIndex * 120);

invalidate();

if (mAngle >= 60) {

listener.onModChange(imageIndex);

}

return true;

}

return false;

}

@Override

public void onDraw(Canvas canvas) {

// Log.i(TAG, "onDraw");

// 大圆

drawInCenter(canvas, bitmapOut, mPointX, mPointY, TAG);

// 外圈

if (isUp) {

mAngle = 0;

} else {

mAngle = currentAngle - beginAngle;

}

Bitmap tempBig = adjustPhotoRotation(bitmapBig, mAngle);

// Log.i(TAG, "mAngle:"+mAngle);

drawInCenter(canvas, tempBig, mPointX, mPointY + 10, TAG);

// 小圆(中间的圆心)

drawInCenter(canvas, bitmaplittele, mPointX, mPointY - 10, TAG);

}

Bitmap adjustPhotoRotation(Bitmap bm, final int orientationDegree) {

if (orientationDegree == 0) {

return bm;

}

Matrix m = new Matrix();

m.setRotate(orientationDegree, (float) bm.getWidth() / 2,

(float) bm.getHeight() / 2);

try {

Bitmap bm1 = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),

bm.getHeight(), m, true);

return bm1;

} catch (OutOfMemoryError ex) {

}

return null;

}

private void drawInCenter(Canvas canvas, Bitmap bitmap, float left,

float top, String text) {

canvas.drawBitmap(bitmap, left - bitmap.getWidth() / 2,

top - bitmap.getHeight() / 2, null);

}

// 子控件位置改变重新计算角度

private int computeCurrentAngle(float x, float y) {

// 根据圆心坐标计算角度

float distance = (float) Math

.sqrt(((x - mPointX) * (x - mPointX) + (y - mPointY)

* (y - mPointY)));

int degree = (int) (Math.acos((x - mPointX) / distance) * 180 / Math.PI);

if (y < mPointY) {

degree = -degree;

}

if (degree < 0) {

degree += 360;

}

// Log.i("RoundSpinView", "x:" + x + ",y:" + y + ",degree:" + degree);

return degree;

}

// 获取距离圆心的距离

private float getDistance(float x, float y) {

// 根据圆心坐标计算角度

float distance = (float) Math

.sqrt(((x - mPointX) * (x - mPointX) + (y - mPointY)

* (y - mPointY)));

return distance;

}

//点击

private boolean SetClick(float x, float y) {

float distance = getDistance(x, y);

if (mAngle>10||mAngle<-10) {

return false;

}else if(endTime-beginTime>1000){

return false;

}

if (distance < bitmapBig.getWidth() / 2) {

int mod = 0;

if (beginAngle < 90 || 330 < beginAngle) {

mod = (imageIndex+3-1)%3;

}

else if (90 < beginAngle && 210 > beginAngle) {

mod = (imageIndex+3-2)%3;

}

else{

mod = imageIndex;

}

//回调到主界面进行处理。

listener.onModClick(mod);

}

return true;

}

public interface RotateViewListener {

void onModClick(int mode);

void onModChange(int mode);

}

}

Activity中调用代码：

[java]

package com.example.roatedemo;

import com.example.roatedemo.RotateView.RotateViewListener;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.util.DisplayMetrics;

import android.util.Log;

import android.widget.Toast;

public class MainActivity extends Activity implements RotateViewListener{
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RotateView rotateView;
String TAG="MainActivity";
Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext = this;
int height,width;
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
height = displayMetrics.heightPixels;
width = displayMetrics.widthPixels;
Log.i(TAG, "height:"+height);
Log.i(TAG, "width:"+width);
rotateView = new RotateView(getApplicationContext(), width/2, height/3, 150,this);

setContentView(rotateView);
}
@Override
public void onModClick(int mode) {
String[] clickStrings = new String[] { "1被点击", "2被点击","3被点击" };
Toast.makeText(mContext, clickStrings[mode], 0).show();

}
@Override
public void onModChange(int mode) {
String[] clickStrings = new String[] { "切换到1", "切换到2","切换到3" };
Toast.makeText(mContext, clickStrings[mode], 0).show();
}


}

package com.example.roatedemo;

import com.example.roatedemo.RotateView.RotateViewListener;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.util.DisplayMetrics;

import android.util.Log;

import android.widget.Toast;

public class MainActivity extends Activity implements RotateViewListener{

RotateView rotateView;

String TAG="MainActivity";

Context mContext;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

mContext = this;

int height,width;

DisplayMetrics displayMetrics = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

height = displayMetrics.heightPixels;

width = displayMetrics.widthPixels;

Log.i(TAG, "height:"+height);

Log.i(TAG, "width:"+width);

rotateView = new RotateView(getApplicationContext(), width/2, height/3, 150,this);

setContentView(rotateView);

}

@Override

public void onModClick(int mode) {

String[] clickStrings = new String[] { "1被点击", "2被点击","3被点击" };

Toast.makeText(mContext, clickStrings[mode], 0).show();

}

@Override

public void onModChange(int mode) {

String[] clickStrings = new String[] { "切换到1", "切换到2","切换到3" };

Toast.makeText(mContext, clickStrings[mode], 0).show();

}

}

原文地址： http://my.eoe.cn/682121/archive/2284.html
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