我一直在搜索一个简单的例子，可以拍照并使用URI保存它，并检索出照片进行图像处理。我尝试了很多例子代码，但是没有一个能够顺利运行。
有没有人有这个例子代码？
如何在Android拍照、保存和获取照片
9
- user1802057
2
2你还做了什么？ - Kanaiya Katarmal
有关这个问题大约有数百个不同的主题...只需搜索即可！ - safari
4个回答
14
像这样定义一个变量
protected static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 0;
使用代码从 Android 调用相机。
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"fname_" +
String.valueOf(System.currentTimeMillis()) + ".jpg"));
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
并在调用此覆盖函数的类中，调用onActivityResult函数并输入以下代码。
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
//use imageUri here to access the image
Bundle extras = data.getExtras();
Log.e("URI",imageUri.toString());
Bitmap bmp = (Bitmap) extras.get("data");
// here you will get the image as bitmap
}
else if (resultCode == RESULT_CANCELED) {
Toast.makeText(this, "Picture was not taken", Toast.LENGTH_SHORT);
}
}
}
- Pramod J George
5
24你是否意识到，使用你提供的代码，你将完整尺寸的图像保存到指定的URI中，但是，你从extras中检索到缩小尺寸的图像，并从该缩小尺寸的图像创建位图？ - paulkayuk
我正在从URI中检索完整大小的图像。你想要缩小的图像吗？ - Pramod J George
1@paulkayuk 我该如何检索完整尺寸的图像而不是压缩的图像？ - onexf
3获取缩略图的方法是：使用语句“Bitmap bmp = (Bitmap) extras.get("data")”获取。请注意，翻译过程中不得添加解释或其他内容，必须保持原意，同时使语言更加通俗易懂。 - JPhi Denis
1有人知道如何获取全尺寸图像吗？我真的很想知道。我已经在StackOverflow线程中搜索了一段时间，只找到了这些七年前的帖子，而那些人也遇到了同样的问题，但没有得到回复... - Daniel Dees
6
- SilentKiller
4
我曾经有同样的问题。
我在网上测试了一些代码，但都没有找到合适的。后来，我学习了一些来自developer.android的基础代码。然后，我将两个不同的代码混合在一起，最终实现了我的目标！以下是代码：
public class MainActivity extends AppCompatActivity {
static final int PICTURE_RESULT = 1;
String mCurrentPhotoPath;
ContentValues values;
private Uri file;
ImageView imageView;
Bitmap help1;
ThumbnailUtils thumbnail;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
values = new ContentValues();
}
public void launch_camera(View v) {
// the intent is my camera
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//getting uri of the file
file = Uri.fromFile(getFile());
//Setting the file Uri to my photo
intent.putExtra(MediaStore.EXTRA_OUTPUT,file);
if(intent.resolveActivity(getPackageManager())!=null)
{
startActivityForResult(intent, PICTURE_RESULT);
}
}
//this method will create and return the path to the image file
private File getFile() {
File folder = Environment.getExternalStoragePublicDirectory("/From_camera/imagens");// the file path
//if it doesn't exist the folder will be created
if(!folder.exists())
{folder.mkdir();}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_"+ timeStamp + "_";
File image_file = null;
try {
image_file = File.createTempFile(imageFileName,".jpg",folder);
} catch (IOException e) {
e.printStackTrace();
}
mCurrentPhotoPath = image_file.getAbsolutePath();
return image_file;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == PICTURE_RESULT) {
if(resultCode == Activity.RESULT_OK) {
try {
help1 = MediaStore.Images.Media.getBitmap(getContentResolver(),file);
imageView.setImageBitmap( thumbnail.extractThumbnail(help1,help1.getWidth(),help1.getHeight()));
}catch (Exception e){
e.printStackTrace();
}
}
}
}
}
XML文件中只有一个Button和一个ImageView，请不要忘记在Android清单文件中声明权限：
<uses-feature android:name="android.hardware.camera" android:required="true" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
如需更多信息，建议查看以下链接： https://developer.android.com/training/camera/photobasics.html#TaskPhotoView https://www.youtube.com/watch?v=je9bdkdNQqg
- matmany
-1
请使用以下代码。
package com.example.stackoverflow;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.math.BigInteger;
import java.security.SecureRandom;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
public class MyCameraActivity extends Activity {
private static final int CAMERA_REQUEST = 1888;
static String str_Camera_Photo_ImagePath = "";
private static File f;
private static int Take_Photo = 2;
private static String str_randomnumber = "";
static String str_Camera_Photo_ImageName = "";
public static String str_SaveFolderName;
private static File wallpaperDirectory;
Bitmap bitmap;
int storeposition = 0;
public static GridView gridview;
public static ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ccccc);
this.imageView = (ImageView)this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.button1);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
str_SaveFolderName = Environment
.getExternalStorageDirectory()
.getAbsolutePath()
+ "/rajeshsample";
str_randomnumber = String.valueOf(nextSessionId());
wallpaperDirectory = new File(str_SaveFolderName);
if (!wallpaperDirectory.exists())
wallpaperDirectory.mkdirs();
str_Camera_Photo_ImageName = str_randomnumber
+ ".jpg";
str_Camera_Photo_ImagePath = str_SaveFolderName
+ "/" + str_randomnumber + ".jpg";
System.err.println(" str_Camera_Photo_ImagePath "
+ str_Camera_Photo_ImagePath);
f = new File(str_Camera_Photo_ImagePath);
startActivityForResult(new Intent(
MediaStore.ACTION_IMAGE_CAPTURE).putExtra(
MediaStore.EXTRA_OUTPUT, Uri.fromFile(f)),
Take_Photo);
System.err.println("f " + f);
}
});
}
// used to create randon numbers
public String nextSessionId() {
SecureRandom random = new SecureRandom();
return new BigInteger(130, random).toString(32);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == Take_Photo) {
String filePath = null;
filePath = str_Camera_Photo_ImagePath;
if (filePath != null) {
Bitmap faceView = ( new_decode(new File(
filePath))); // ========================> good
// lines
imageView.setImageBitmap(faceView);
} else {
bitmap = null;
}
}
}
public static Bitmap new_decode(File f) {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
o.inDither = false; // Disable Dithering mode
o.inPurgeable = true; // Tell to gc that whether it needs free memory,
// the Bitmap can be cleared
o.inInputShareable = true; // Which kind of reference will be used to
// recover the Bitmap data after being
// clear, when it will be used in the future
try {
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 300;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 1.5 < REQUIRED_SIZE && height_tmp / 1.5 < REQUIRED_SIZE)
break;
width_tmp /= 1.5;
height_tmp /= 1.5;
scale *= 1.5;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
// o2.inSampleSize=scale;
o.inDither = false; // Disable Dithering mode
o.inPurgeable = true; // Tell to gc that whether it needs free memory,
// the Bitmap can be cleared
o.inInputShareable = true; // Which kind of reference will be used to
// recover the Bitmap data after being
// clear, when it will be used in the future
// return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
try {
// return BitmapFactory.decodeStream(new FileInputStream(f), null,
// null);
Bitmap bitmap= BitmapFactory.decodeStream(new FileInputStream(f), null, null);
System.out.println(" IW " + width_tmp);
System.out.println("IHH " + height_tmp);
int iW = width_tmp;
int iH = height_tmp;
return Bitmap.createScaledBitmap(bitmap, iW, iH, true);
} catch (OutOfMemoryError e) {
// TODO: handle exception
e.printStackTrace();
// clearCache();
// System.out.println("bitmap creating success");
System.gc();
return null;
// System.runFinalization();
// Runtime.getRuntime().gc();
// System.gc();
// decodeFile(f);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="photo" >
</Button>
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_action_search" >
</ImageView>
</LinearLayout>
- itsrajesh4uguys
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