拍摄一张照片带摄像头，并得到位图 [英] Take a picture with camera and get bitmap
问题描述
多数民众赞成不是重复：我问这个函数!!!!无需用户交互!!!!
THATS NOT A DUPLICATE: I ASKED FOR THIS FUNCTION !!!!WITHOUT USER INTERACTION!!!!
我正在为这是使用前置摄像头前面来模拟用户镜子的Android应用程序。我需要的应用每5秒为位图自动拍摄一张照片！无需用户交互!!!，我喜欢用另一个位以后结合起来。
I am working on an app for android which is using the front facing camera to simulate a mirror for the user. I need the app to take a picture every 5 seconds as a bitmap automatically !!!without user interaction!!!, which I like to combine with another bitmap later on.
对我来说，困难的部分：如何拍照，并把它作为一个位图
The difficult part for me: How to take a picture and get it as a bitmap?
我试了几种解决方案，但都不是很好呢。
I tried several solutions, but none was fine yet.
推荐答案
我用下面的code，以显示在布局后台实时摄像机饲料和按钮保存图像为JPEG格式。尝试，并根据需要进行修改：
你可以在这里下载完整测试项目，让您可以快速测试：
http://www.4shared.com/rar/v-ZQPybcce/Test.html
I used the following code to show live camera feed in a layout background and the button saves the image as jpeg. Try and modify it as you wish : You can download the entire test project here so that you can test it fast : http://www.4shared.com/rar/v-ZQPybcce/Test.html
--- >>从其他使用意向此code的区别是，它会自动拍摄照片，而无需打开相机应用，这使得应用程序看起来更好:)＆LT; ----
--->>The difference of this code from others using intents is that it takes the picture automatically without opening the camera app which makes the app look better :) <----
package com.mreprogramming.test;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap.CompressFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.preference.PreferenceManager;
public class CameraActivity extends Activity implements SurfaceHolder.Callback{
protected static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 0;
private SurfaceView SurView;
private SurfaceHolder camHolder;
private boolean previewRunning;
private Button button1;
final Context context = this;
public static Camera camera = null;
private ImageView camera_image;
private Bitmap bmp,bmp1;
private ByteArrayOutputStream bos;
private BitmapFactory.Options options,o,o2;
private FileInputStream fis;
ByteArrayInputStream fis2;
private FileOutputStream fos;
private File dir_image2,dir_image;
private RelativeLayout CamView;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera);
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);
button1 = (Button)findViewById(R.id.button_1);
camera_image = (ImageView) findViewById(R.id.camera_image);
button1.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
button1.setClickable(false);
button1.setVisibility(View.INVISIBLE); //<-----HIDE HERE
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();
Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera=null;
}
public void TakeScreenshot(){
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
int nu = preferences.getInt("image_num",0);
nu++;
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("image_num",nu);
editor.commit();
CamView.setDrawingCacheEnabled(true);
CamView.buildDrawingCache(true);
bmp = Bitmap.createBitmap(CamView.getDrawingCache());
CamView.setDrawingCacheEnabled(false);
bos = new ByteArrayOutputStream();
bmp.compress(CompressFormat.JPEG, 100, bos);
byte[] bitmapdata = bos.toByteArray();
fis2 = new ByteArrayInputStream(bitmapdata);
String picId=String.valueOf(nu);
String myfile="MyImage"+picId+".jpeg";
dir_image = new File(Environment.getExternalStorageDirectory()+
File.separator+"My Custom Folder");
dir_image.mkdirs();
try {
File tmpFile = new File(dir_image,myfile);
fos = new FileOutputStream(tmpFile);
byte[] buf = new byte[1024];
int len;
while ((len = fis2.read(buf)) > 0) {
fos.write(buf, 0, len);
}
fis2.close();
fos.close();
Toast.makeText(getApplicationContext(),
"The file is saved at :/My Custom Folder/"+"MyImage"+picId+".jpeg",Toast.LENGTH_LONG).show();
bmp1 = null;
camera_image.setImageBitmap(bmp1);
camera.startPreview();
button1.setClickable(true);
button1.setVisibility(View.VISIBLE);//<----UNHIDE HER
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
dir_image2 = new File(Environment.getExternalStorageDirectory()+
File.separator+"My Custom Folder");
dir_image2.mkdirs();
File tmpFile = new File(dir_image2,"TempImage.jpg");
try {
fos = new FileOutputStream(tmpFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
}
options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
bmp1 = decodeFile(tmpFile);
bmp=Bitmap.createScaledBitmap(bmp1,CamView.getWidth(), CamView.getHeight(),true);
camera_image.setImageBitmap(bmp);
tmpFile.delete();
TakeScreenshot();
}
};
public Bitmap decodeFile(File f) {
Bitmap b = null;
try {
// Decode image size
o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
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)));
}
// Decode with inSampleSize
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;
}
}
这是camera.xml
This is the camera.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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" />
<ImageView
android:id="@+id/camera_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/app_name" />
<Button
android:id="@+id/button_1"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
添加到您的清单：
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
此外，在清单中添加下面的CameraActivity活动选项卡，以确保您的活动将始终处于横向，否则拿着写真（直立）的电话，除非你改变了code将反转图像的长宽比和严重歪曲。
Also in the manifest add the following to the "CameraActivity" activity tab to make sure that your activity will always be in landscape orientation because otherwise holding the phone in protrait(upright) unless you change the code it will reverse the image's aspect ratio and severely distort it.
<activity
android:name="com.mreprogramming.test.CameraActivity"
android:label="@string/app_name"
android:screenOrientation="landscape" > <-------ADD THIS ---!!!!!
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
和保存为styles.xml使您的布局全屏
And save this as styles.xml to make your layout fullscreen
<resources>
<!--
Base application theme, dependent on API level. This theme is replaced
by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
-->
<style name="AppBaseTheme" parent="android:Theme.NoTitleBar.Fullscreen">
<!--
Theme customizations available in newer API levels can go in
res/values-vXX/styles.xml, while customizations related to
backward-compatibility can go here.
-->
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="android:Theme.NoTitleBar.Fullscreen">
<item name="android:windowFullscreen">true</item>
<item name="android:windowNoTitle">true</item>
</style>
在我的应用程序我想要的图像捕捉布局不只是相机饲料这样的每一个观点：
In my app i want the image to capture every view of the layout not just the camera feed like this :
测试code我张贴在这里隐藏了拍摄按钮，这样它不会出现在你的照片。如果在您的应用程序更多观点，并不不会在他们的照片为显示隐藏同时捕捉（见code知道藏在哪里），或编辑code。
The test code I posted here hides the capture button so that it wont appear in your photo. If you have more views in your app and don't won't them to show in the photo either hide them while capturing (see code to know where to hide) or edit the code.
------>总结起来我的帖子这个code可以做基本的捕获和保存JPEG，但如果你想专业的图像，你需要编辑它一下。好运：）LT; ------
------>To sum up my post this code can do the basic capturing and saving a jpeg but if you want professional images you need to edit it a bit. Good Luck :)<------
这篇关于拍摄一张照片带摄像头，并得到位图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！
