Android 照片特效

android 实现图片的翻转

1	Resources res = this.getContext().getResources();

2	img = BitmapFactory.decodeResource(res, R.drawable.aa);

3	Matrix matrix = new Matrix();

4	matrix.postRotate(180);        /*翻转180度*/

5	int width = img.getWidth();

6	int height = img.getHeight();

7	img_a = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);

然后可以直接把img_a draw到画布上，canvas.drawBitmap(img_a, 10, 10, p);

Matrix 是一个处理翻转、缩放等图像效果的重要类

Matrix.postScale 可设置缩放比例，默认为1

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android 实现图片的旋转

01	public class ex04_22 extends Activity{

02

03	private ImageView mImageView;

04	private Button btn1,btn2;

05	private TextView mTextView;

06	private AbsoluteLayout layout1;

07	private int ScaleTimes=1,ScaleAngle=1;

08

@Override

09	public void onCreate(Bundle savedInstanceState) {

10	super.onCreate(savedInstanceState);

11	setContentView(R.layout.main);

12	mImageView=(ImageView)findViewById(R.id.myImageView);

13	final Bitmap bmp=BitmapFactory.decodeResource(this.getResources(),R.drawable.ex04_22_1);

14	final int widthOrig=bmp.getWidth();

15	final int heightOrig=bmp.getHeight();

16	mImageView.setImageBitmap(bmp);

17	btn1=(Button)findViewById(R.id.myButton1);

18	btn1.setOnClickListener(new OnClickListener(){

19	public void onClick(View v){

20	ScaleAngle--;

21	if(ScaleAngle<-60){

22	ScaleAngle=-60;

23

}

24	int newWidth=widthOrig*ScaleTimes;

25	int newHeight=heightOrig*ScaleTimes;

26	float scaleWidth=((float)newWidth)/widthOrig;

27	float scaleHeight=((float)newHeight)/heightOrig;

28	Matrix matrix=new Matrix();

29	matrix.postScale(scaleWidth, scaleHeight);

30	matrix.setRotate(5*ScaleAngle);

31	Bitmap resizeBitmap=Bitmap.createBitmap(bmp, 0, 0, widthOrig, heightOrig, matrix, true);

32	BitmapDrawable myNewBitmapDrawable=new BitmapDrawable(resizeBitmap);

33	mImageView.setImageDrawable(myNewBitmapDrawable);

34

}

35

});

36	btn2=(Button)findViewById(R.id.myButton2);

37	btn2.setOnClickListener(new OnClickListener(){

38	public void onClick(View v){

39	ScaleAngle++;

40	if(ScaleAngle>60){

41	ScaleAngle=60;

42

}

43	int newWidth=widthOrig*ScaleTimes;

44	int newHeight=heightOrig*ScaleTimes;

45	float scaleWidth=((float)newWidth)/widthOrig;

46	float scaleHeight=((float)newHeight)/heightOrig;

47	Matrix matrix=new Matrix();

48	matrix.postScale(scaleWidth, scaleHeight);

49	matrix.setRotate(5*ScaleAngle);

50	Bitmap resizeBitmap=Bitmap.createBitmap(bmp, 0, 0, widthOrig, heightOrig, matrix, true);

51	BitmapDrawable myNewBitmapDrawable=new BitmapDrawable(resizeBitmap);

52	mImageView.setImageDrawable(myNewBitmapDrawable);

53

}

54

});

55

}

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实现画面淡入淡出效果可以用 ：setAlpha(alpha);
alpha从255，逐渐递减!

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如何实现屏幕的滚动效果，这里有两个关键点，一个是实现OnGestureListener，

以便在触摸事件发生的时候，被回调。包括按下，滚动等等，按照API文档，

需要分两步来实现检测手势行为。

1）创建GestureDetector实例

2) 在onTouchEvent()方法中调用GestureDetector的onTouchEvent()方法。

另一个关键点是自己实现一个简单的View，来绘制图片。

代码如下所示。由于，我们不需要使用layout定义，所以不需要提供xml文件。
直接在程序里面setContentView()即可。

001	package com.j2medev;

002

003	import android.app.Activity;

004	import android.content.Context;

005	import android.content.res.Resources;

006	import android.graphics.Bitmap;

007	import android.graphics.BitmapFactory;

008	import android.graphics.Canvas;

009	import android.graphics.Paint;

010	import android.os.Bundle;

011	import android.view.GestureDetector;

012	import android.view.MotionEvent;

013	import android.view.View;

014	import android.view.ViewGroup;

015	import android.view.GestureDetector.OnGestureListener;

016

017	public class HorizontalScroll extends Activity implements OnGestureListener {

018	private static final int X_MAX = 800;

019	private static final int Y_MAX = 600;

020	private int scrollX = 0;

021	private int scrollY = 0;

022

023	MyView main;

024	Bitmap bmp;

025	Bitmap adapt;

026	Resources res;

027	Paint paint;

028	GestureDetector gestureScanner;

029

030

@Override

031	public void onCreate(Bundle savedInstanceState) {

032	super.onCreate(savedInstanceState);

033

034	gestureScanner = new GestureDetector(this);

035	paint = new Paint();

036

037	res = getResources();

038	bmp = BitmapFactory.decodeResource(res, R.drawable.arc);

039	adapt = Bitmap.createBitmap(bmp);

040

041	main = new MyView(this);

042	setContentView(main, new ViewGroup.LayoutParams(800, 600));

043

}

044

045

@Override

046	public boolean onTouchEvent(MotionEvent me) {

047	return gestureScanner.onTouchEvent(me);

048

}

049

050	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,

051	float distanceY) {

052	main.handleScroll(distanceX, distanceY);

053	return true;

054

}

055

056	public boolean onDown(MotionEvent e) {

057	return true;

058

}

059

060	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

061	float velocityY) {

062	return true;

063

}

064

065	public void onLongPress(MotionEvent e) {

066

}

067

068	public void onShowPress(MotionEvent e) {

069

}

070

071	public boolean onSingleTapUp(MotionEvent e) {

072	return true;

073

}

074

075

// //

076

// /

077

//

078

079	class MyView extends View {

080	public MyView(Context context) {

081	super(context);

082

}

083

084

@Override

085	protected void onDraw(Canvas canvas) {

086	canvas.drawBitmap(adapt, -scrollX, -scrollY, paint);

087

}

088

089	public void handleScroll(float distX, float distY) {

090

// X-Axis

091

092	if (distX > 6.0) {

093	if (scrollX < 460) {

094	scrollX += 15;

095

}

096	} else if (distX < -6.0) {

097	if (scrollX >= 15) {

098	scrollX -= 15;

099

}

100

}

101

// //

102

103	// Y-AXIS //

104	if (distY > 6.0) {

105	if (scrollY < 100) {

106	scrollY += 15;

107

}

108	} else if (distY < -6.0) {

109	if (scrollY >= 15) {

110	scrollY -= 15;

111

}

112

}

113

// //

114

//

115	// if ((scrollX <= 480) && (scrollY <= 120)) {

116	// adapt = Bitmap.createBitmap(bmp, scrollX, scrollY, 320, 480);

117	// invalidate();

118

// }

119	invalidate();

120

}

121

}

122

}

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教你在谷歌Android平台中处理图片

操作图像像素

现在你可以对单独的像素进行处理了。通过使用android.graphics.Bitmap API中的

getPixels，可以加载像素到一个整数数组中。在本文例子中，你将按照一定规则对每一

个像素实现着色。经过这个处理后，所有的像素将被转化为一个范围在0到255的字节码。

android.graphics.Bitmap API中的setPixels则用来加载这个整数数组到一个图像中。

最后一步是通过ImageView变量mIV来更新屏幕。以下是实现这个染色过程的代码片段。

01	private void TintThePicture(int deg) {

02	int[] pix = new int[picw * pich];

03	mBitmap.getPixels(pix, 0, picw, 0, 0, picw, pich);

04

05	int RY, GY, BY, RYY, GYY, BYY, R, G, B, Y;

06	double angle = (3.14159d * (double)deg) / 180.0d;

07	int S = (int)(256.0d * Math.sin(angle));

08	int C = (int)(256.0d * Math.cos(angle));

09

10	for (int y = 0; y < pich; y++)

11	for (int x = 0; x < picw; x++)

12

{

13	int index = y * picw + x;

14	int r = (pix[index] >> 16) & 0xff;

15	int g = (pix[index] >> 8) & 0xff;

16	int b = pix[index] & 0xff;

17	RY = ( 70 * r - 59 * g - 11 * b) / 100;

18	GY = (-30 * r + 41 * g - 11 * b) / 100;

19	BY = (-30 * r - 59 * g + 89 * b) / 100;

20	Y = ( 30 * r + 59 * g + 11 * b) / 100;

21	RYY = (S * BY + C * RY) / 256;

22	BYY = (C * BY - S * RY) / 256;

23	GYY = (-51 * RYY - 19 * BYY) / 100;

24	R = Y + RYY;

25	R = (R < 0) ? 0 : ((R > 255) ? 255 : R);

26	G = Y + GYY;

27	G = (G < 0) ? 0 : ((G > 255) ? 255 : G);

28	B = Y + BYY;

29	B = (B < 0) ? 0 : ((B > 255) ? 255 : B);

30	pix[index] = 0xff000000 | (R << 16) | (G << 8) | B;

31

}

32

33	Bitmap bm = Bitmap.createBitmap(picw, pich, false);

34	bm.setPixels(pix, 0, picw, 0, 0, picw, pich);

35

36	// Put the updated bitmap into the main view

37	mIV.setImageBitmap(bm);

38	mIV.invalidate();

39

40	mBitmap = bm;

41	pix = null;

42

}

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android 图片的放大和缩小

01	public class ex04_22 extends Activity{

02	private ImageView mImageView;

03	private Button btn1,btn2;

04	private TextView mTextView;

05	private AbsoluteLayout layout1;

06	private Bitmap bmp;

07	private int id=0;

08	private int displayWidth,displayHeight;

09	private float scaleWidth=1,scaleHeight=1;

10	private final static String filename="/data/data/ex04_22.lcs/ex04_22_2.png";

11

@Override

12	public void onCreate(Bundle savedInstanceState) {

13	super.onCreate(savedInstanceState);

14	setContentView(R.layout.main);

15

//取得屏幕分辨率

16	DisplayMetrics dm=new DisplayMetrics();

17	getWindowManager().getDefaultDisplay().getMetrics(dm);

18	displayWidth=dm.widthPixels;

19	displayHeight=dm.heightPixels-80;

20	bmp=BitmapFactory.decodeResource(this.getResources(),R.drawable.ex04_22_1);

21	layout1=(AbsoluteLayout)findViewById(R.id.layout1);

22	mImageView=(ImageView)findViewById(R.id.myImageView);

23	btn1=(Button)findViewById(R.id.myButton1);

24	btn1.setOnClickListener(new OnClickListener(){

25	public void onClick(View v){

26

small();

27

}

28

});

29	btn2=(Button)findViewById(R.id.myButton2);

30	btn2.setOnClickListener(new OnClickListener(){

31	public void onClick(View v){

32

big();

33

}

34

});

35

}

36	private void small(){

37	//获得Bitmap的高和宽

38	int bmpWidth=bmp.getWidth();

39	int bmpHeight=bmp.getHeight();

40

//设置缩小比例

41	double scale=0.8;

42	//计算出这次要缩小的比例

43	scaleWidth=(float)(scaleWidth*scale);

44	scaleHeight=(float)(scaleHeight*scale);

45	//产生resize后的Bitmap对象

46	Matrix matrix=new Matrix();

47	matrix.postScale(scaleWidth, scaleHeight);

48	Bitmap resizeBmp=Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeight, matrix, true);

49	if(id==0){

50	layout1.removeView(mImageView);

51

}

52

else{

53	layout1.removeView((ImageView)findViewById(id));

54

}

55

id++;

56	ImageView imageView=new ImageView(this);

57	imageView.setId(id);

58	imageView.setImageBitmap(resizeBmp);

59	layout1.addView(imageView);

60	setContentView(layout1);

61	btn2.setEnabled(true);

62

}

63	private void big(){

64	//获得Bitmap的高和宽

65	int bmpWidth=bmp.getWidth();

66	int bmpHeight=bmp.getHeight();

67

//设置缩小比例

68	double scale=1.25;

69	//计算出这次要缩小的比例

70	scaleWidth=(float)(scaleWidth*scale);

71	scaleHeight=(float)(scaleHeight*scale);

72	//产生resize后的Bitmap对象

73	Matrix matrix=new Matrix();

74	matrix.postScale(scaleWidth, scaleHeight);

75	Bitmap resizeBmp=Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeight, matrix, true);

76	if(id==0){

77	layout1.removeView(mImageView);

78

}

79

else{

80	layout1.removeView((ImageView)findViewById(id));

81

}

82

id++;

83	ImageView imageView=new ImageView(this);

84	imageView.setId(id);

85	imageView.setImageBitmap(resizeBmp);

86	layout1.addView(imageView);

87	setContentView(layout1);

88	if(scaleWidth*scale*bmpWidth>displayWidth||scaleHeight*scale*scaleHeight>displayHeight){

89	btn2.setEnabled(false);

90

}

91

}

92

}

xml文件

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

02	<AbsoluteLayout

03	android:id="@+id/layout1"

04	android:layout_width="fill_parent"

05	android:layout_height="fill_parent"

06	xmlns:android="http://schemas.android.com/apk/res/android"

07

>

08	<ImageView

09	android:id="@+id/myImageView"

10	android:layout_width="200px"

11	android:layout_height="150px"

12	android:src="@drawable/ex04_22_1"

13	android:layout_x="0px"

14	android:layout_y="0px"

15

>

16	</ImageView>

17

<Button

18	android:id="@+id/myButton1"

19	android:layout_width="90px"

20	android:layout_height="60px"

21	android:text="缩小"

22	android:textSize="18sp"

23	android:layout_x="20px"

24	android:layout_y="372px"

25

>

26

</Button>

27

<Button

28	android:id="@+id/myButton2"

29	android:layout_width="90px"

30	android:layout_height="60px"

31	android:text="放大"

32	android:textSize="18sp"

33	android:layout_x="210px"

34	android:layout_y="372px"

35

>

36

</Button>

37	</AbsoluteLayout>

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android 图片透明度处理代码

01	public static Bitmap setAlpha(Bitmap sourceImg, int number) {

02

03	int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];

04

05	sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值

06

07	number = number * 255 / 100;

08

09	for (int i = 0; i < argb.length; i++) {

10

11	argb = (number << 24) | (argb & 0x00FFFFFF);// 修改最高2位的值

12

13

}

14

15	sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);

16

17	return sourceImg;

18

19

}