SurfaceView的捕获屏幕 [英] Capture screen of SurfaceView
本文介绍了SurfaceView的捕获屏幕的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在上图中我有一个 SurfaceView 和一个按钮名为拍摄。 SurfaceView 正显示出相机preVIEW。所以，我想 surfaceview 当我在点击捕获按钮的屏幕截图。我试过很多例子和答案，但他们没有工作。我刚刚得到的黑色屏幕截图图片。
在一些帖子我还发现这是不可能采取 surfaceview 的屏幕截图。所以，请帮我看看诸如任何替代解决方案。
下面是一些答案我已经看到了：
<一个href=\"http://stackoverflow.com/questions/25091703/how-to-create-and-save-a-screenshot-from-a-surfaceview\">how创建并从surfaceview保存截图？
<一个href=\"http://stackoverflow.com/questions/18289544/taking-screenshot-programmatically-doesnt-capture-the-contents-of-surfaceview\">Taking截图编程犯规捕捉surfaceVIew 的内容
<一个href=\"http://stackoverflow.com/questions/11505093/how-to-capture-screenshot-of-surfaceview-with-background\">How捕捉背景 surfaceview的截图
等等。
这是我的电话活动code：
公共类CamView扩展活动实现SurfaceHolder.Callback { 受保护的静态最终诠释CAPTURE_IMAGE_ACTIVITY_REQUEST_ code = 0; 私人SurfaceView SurView; 私人SurfaceHolder camHolder; 私人布尔previewRunning; 最后上下文的背景下=这; 公共静态摄像头摄像头= NULL; 私人的RelativeLayout CamView; 私人位图BMP1; @燮pressWarnings（德precation）
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_cam_view）; CamView =（RelativeLayout的）findViewById（R.id.camview）;
SurView =（SurfaceView）findViewById（R.id.sview）;
camHolder = SurView.getHolder（）;
camHolder.addCallback（本）;
camHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）; 按钮BTN =（按钮）findViewById（R.id.button1）; btn.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
camera.takePicture（NULL，NULL，mPicture）;
}
}）;
} @覆盖
公共无效surfaceChanged（SurfaceHolder架，INT格式，诠释的宽度，高度INT）{
如果（previewRunning）{
camera.stop preVIEW（）;
}
Camera.Parameters camParams = camera.getParameters（）;
Camera.Size大小= camParams.getSupported previewSizes（）得到（0）;
camParams.set previewSize（size.width，size.height）;
camera.setParameters（camParams）;
尝试{
camera.set previewDisplay（支架）;
camera.start preVIEW（）;
previewRunning = TRUE;
}
赶上（IOException异常五）{
e.printStackTrace（）;
}
} 公共无效surfaceCreated（SurfaceHolder持有人）{
尝试{
相机= Camera.open（）;
}
赶上（例外五）{
e.printStackTrace（）;
完（）;
}
} @覆盖
公共无效surfaceDestroyed（SurfaceHolder持有人）{
camera.stop preVIEW（）;
camera.release（）;
摄像头= NULL;
} 公共无效TakeScreenshot（）{
随机数，=新的随机（）;
INT NU = num.nextInt（1000）;
CamView.setDrawingCacheEnabled（真）;
CamView.buildDrawingCache（真）;
BMP位图= Bitmap.createBitmap（CamView.getDrawingCache（））;
CamView.setDrawingCacheEnabled（假）;
ByteArrayOutputStream BOS =新ByteArrayOutputStream（）;
bmp.com preSS（比较pressFormat.JPEG，100，BOS）;
字节[] =的BitmapData bos.toByteArray（）;
ByteArrayInputStream的FIS =新ByteArrayInputStream进行（的BitmapData）; 字符串picId =将String.valueOf（NU）;
字符串MYFILE =阿南+ picId +.JPEG 文件dir_image =新的文件（Environment.getExternalStorageDirectory（）+文件分割符+阿南）;
dir_image.mkdirs（）;
尝试{
文件TMPFILE =新的文件（dir_image，MYFILE）;
FOS的FileOutputStream =新的FileOutputStream（TMPFILE）; 字节[] buf中=新的字节[1024];
INT LEN;
而（（LEN = fis.read（BUF））大于0）{
fos.write（BUF，0，LEN）;
}
fis.close（）;
fos.close（）;
BMP1 = NULL; camera.start preVIEW（）;
}
赶上（FileNotFoundException异常五）{
e.printStackTrace（）;
}
赶上（IOException异常五）{
e.printStackTrace（）;
}
} 私人PictureCallback mPicture =新PictureCallback（）{
@覆盖
公共无效onPictureTaken（字节[]数据，相机摄像头）{ 文件dir_image2 =新的文件（Environment.getExternalStorageDirectory（）+文件分割符+阿南）;
dir_image2.mkdirs（）;
文件TMPFILE =新的文件（dir_image2TempPic.jpg）;
尝试{
FOS的FileOutputStream =新的FileOutputStream（TMPFILE）;
fos.write（数据）;
fos.close（）;
}
赶上（FileNotFoundException异常五）{
}
赶上（IOException异常五）{
} 字符串路径=（Environment.getExternalStorageDirectory（）+文件分割符+阿南+文件分割符+TempPic.jpg）; BitmapFactory.Options选项=新BitmapFactory.Options（）;
options.in preferredConfig = Bitmap.Config.ARGB_8888;
BMP1 = BitmapFactory.de codeFILE（路径选择）; tmpFile.delete（）;
TakeScreenshot（）;
}
}; 公共位图德codeFILE（文件f）{
位图B = NULL;
尝试{
BitmapFactory.Options O =新BitmapFactory.Options（）;
o.inJustDe codeBounds = TRUE; FIS的FileInputStream =新的FileInputStream（F）;
BitmapFactory.de codeStream（FIS，空，O）;
fis.close（）;
INT IMAGE_MAX_SIZE = 1000;
int标= 1;
如果（o.outHeight＆GT; IMAGE_MAX_SIZE || o.outWidth＆GT; IMAGE_MAX_SIZE）{
比例=（int）的Math.pow（2，（int）的Math.round（将Math.log（IMAGE_MAX_SIZE /（双）Math.max（o.outHeight，o.outWidth））/将Math.log（0.5）））;
} BitmapFactory.Options O2 =新BitmapFactory.Options（）;
o2.inSampleSize =规模;
FIS =新的FileInputStream（F）;
B = BitmapFactory.de codeStream（FIS，空，O2）;
fis.close（）;
}
赶上（IOException异常五）{
e.printStackTrace（）;
}
返回b;
}
}
这是我的布局code：
＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;的RelativeLayout的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：ID =@ + ID / camview＆GT;＆LT; SurfaceView
机器人：ID =@ + ID / sview
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：layout_alignParentLeft =真
机器人：layout_alignParentTop =真/＆GT;＆LT;按钮
机器人：ID =@ + ID /按钮1
风格=机器人：ATTR / buttonStyleSmall
机器人：layout_width =WRAP_CONTENT
机器人：layout_height =WRAP_CONTENT
机器人：layout_alignParentLeft =真
机器人：layout_alignParentTop =真/＆GT;
＆LT; / RelativeLayout的＆GT;
解决方案
在code我用它来拍摄一张照片;
buttonClick =（按钮）findViewById（R.id.btnBasicCamTakePic）;
buttonClick.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
preview.camera.takePicture（shutterCallback，rawCallback，jpegCallback）;
}
}）; ShutterCallback shutterCallback =新ShutterCallback（）{
公共无效onShutter（）{
Log.d（TAGonShutter'd）;
}
}; / **处理数据为原料的图片* /
PictureCallback rawCallback =新PictureCallback（）{
公共无效onPictureTaken（字节[]数据，相机摄像头）{
Log.d（TAGonPictureTaken - 原始）;
}
}; / **处理数据为JPEG图片* /
PictureCallback jpegCallback =新PictureCallback（）{
公共无效onPictureTaken（字节[]数据，相机摄像头）{ 文件myExternalFile =新的文件（BasicCam.this.getExternalFilesDir（/ MyFileStorage / qrscans /），文件名）;
myExternalFile.delete（）;
myExternalFile.createNewFile（）;
FileOutputStream中输出=新的FileOutputStream（myExternalFile）;
output.write（数据2）;
output.flush（）;
output.close（）;
}
}）;
In above image i have one SurfaceView and one Button named Capture. SurfaceView is showing camera preview. So, I want screenshot of surfaceview when i click on Capture button. I had tried many examples and answers but none of them works. I just get Black Screenshot image.
In some posts i also found it is impossible to take screenshot of surfaceview. So please help me any alternative solution with example.
Here are some answers I already seen:
how to create and save a screenshot from a surfaceview?
Taking screenshot programmatically doesnt capture the contents of surfaceVIew
How to capture screenshot of surfaceview with background
and many more.
This is my activity call code:
public class CamView extends Activity implements SurfaceHolder.Callback {
protected static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 0;
private SurfaceView SurView;
private SurfaceHolder camHolder;
private boolean previewRunning;
final Context context = this;
public static Camera camera = null;
private RelativeLayout CamView;
private Bitmap bmp1;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cam_view);
CamView = (RelativeLayout) findViewById(R.id.camview);
SurView = (SurfaceView) findViewById(R.id.sview);
camHolder = SurView.getHolder();
camHolder.addCallback(this);
camHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
camera.takePicture(null, null, mPicture);
}
});
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (previewRunning) {
camera.stopPreview();
}
Camera.Parameters camParams = camera.getParameters();
Camera.Size size = camParams.getSupportedPreviewSizes().get(0);
camParams.setPreviewSize(size.width, size.height);
camera.setParameters(camParams);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
previewRunning = true;
}
catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceCreated(SurfaceHolder holder) {
try {
camera = Camera.open();
}
catch (Exception e) {
e.printStackTrace();
finish();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
public void TakeScreenshot() {
Random num = new Random();
int nu = num.nextInt(1000);
CamView.setDrawingCacheEnabled(true);
CamView.buildDrawingCache(true);
Bitmap bmp = Bitmap.createBitmap(CamView.getDrawingCache());
CamView.setDrawingCacheEnabled(false);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bmp.compress(CompressFormat.JPEG, 100, bos);
byte[] bitmapdata = bos.toByteArray();
ByteArrayInputStream fis = new ByteArrayInputStream(bitmapdata);
String picId = String.valueOf(nu);
String myfile = "anand" + picId + ".jpeg";
File dir_image = new File(Environment.getExternalStorageDirectory() + File.separator + "anand");
dir_image.mkdirs();
try {
File tmpFile = new File(dir_image, myfile);
FileOutputStream fos = new FileOutputStream(tmpFile);
byte[] buf = new byte[1024];
int len;
while ((len = fis.read(buf)) > 0) {
fos.write(buf, 0, len);
}
fis.close();
fos.close();
bmp1 = null;
camera.startPreview();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File dir_image2 = new File(Environment.getExternalStorageDirectory() + File.separator + "anand");
dir_image2.mkdirs();
File tmpFile = new File(dir_image2, "TempPic.jpg");
try {
FileOutputStream fos = new FileOutputStream(tmpFile);
fos.write(data);
fos.close();
}
catch (FileNotFoundException e) {
}
catch (IOException e) {
}
String path = (Environment.getExternalStorageDirectory() + File.separator + "anand" + File.separator + "TempPic.jpg");
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
bmp1 = BitmapFactory.decodeFile(path, options);
tmpFile.delete();
TakeScreenshot();
}
};
public Bitmap decodeFile(File f) {
Bitmap b = null;
try {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream fis = new FileInputStream(f);
BitmapFactory.decodeStream(fis, null, o);
fis.close();
int IMAGE_MAX_SIZE = 1000;
int scale = 1;
if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
scale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
fis = new FileInputStream(f);
b = BitmapFactory.decodeStream(fis, null, o2);
fis.close();
}
catch (IOException e) {
e.printStackTrace();
}
return b;
}
}
This is my layout code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/camview">
<SurfaceView
android:id="@+id/sview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
解决方案
The code i use to capture a picture;
buttonClick = (Button) findViewById(R.id.btnBasicCamTakePic);
buttonClick.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
preview.camera.takePicture(shutterCallback, rawCallback,jpegCallback);
}
});
ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() {
Log.d(TAG, "onShutter'd");
}
};
/** Handles data for raw picture */
PictureCallback rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d(TAG, "onPictureTaken - raw");
}
};
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
File myExternalFile = new File(BasicCam.this.getExternalFilesDir("/MyFileStorage/qrscans/"), fileName);
myExternalFile.delete();
myExternalFile.createNewFile();
FileOutputStream output = new FileOutputStream(myExternalFile);
output.write(data2);
output.flush();
output.close();
}
});
这篇关于SurfaceView的捕获屏幕的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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