Question

我创建了一个带按钮的应用程序，并为该按钮编写了onClickListener。我已经尝试了几个示例代码示例，但没有一个有效。他们都带来了Android相机应用程序而且没有拍照。我想要一些我可以放在onClickListener中的代码，所以当我按下屏幕上的按钮时，会拍摄一张照片。

如果在Android活动中按下按钮，如何让相机拍照？

Answer 1

请查看以下演示代码。

这是用于UI的XML文件，

<?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/btnCapture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Camera" />

</LinearLayout>

这是你的Java类文件，

public class CameraDemoActivity extends Activity {
    int TAKE_PHOTO_CODE = 0;
    public static int count = 0;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Here, we are making a folder named picFolder to store
        // pics taken by the camera using this application.
        final String dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/picFolder/";
        File newdir = new File(dir);
        newdir.mkdirs();

        Button capture = (Button) findViewById(R.id.btnCapture);
        capture.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                // Here, the counter will be incremented each time, and the
                // picture taken by camera will be stored as 1.jpg,2.jpg
                // and likewise.
                count++;
                String file = dir+count+".jpg";
                File newfile = new File(file);
                try {
                    newfile.createNewFile();
                }
                catch (IOException e)
                {
                }

                Uri outputFileUri = Uri.fromFile(newfile);

                Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

                startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
            Log.d("CameraDemo", "Pic saved");
        }
    }
}

注意：

在清单文件中指定以下权限

<uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Answer 2

拍摄照片的方法有两种：

1 - 使用意图制作照片

2 - 使用相机API

我认为你应该使用第二种方式，其中两种方式有sample code here。

Answer 3

您可以使用Magical Take Photo库。

<强> 1。尝试使用gradle编译

compile 'com.frosquivel:magicaltakephoto:1.0'

<强> 2。您需要在manifest.xml中使用此权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA"/>

第3。像这样的类

//“this”是当前的活动参数

MagicalTakePhoto magicalTakePhoto =  new MagicalTakePhoto(this,ANY_INTEGER_0_TO_4000_FOR_QUALITY);

<强> 4。如果你需要拍照，请使用方法

magicalTakePhoto.takePhoto("my_photo_name");

<强> 5。如果您需要在设备中选择图片，请尝试使用以下方法：

magicalTakePhoto.selectedPicture("my_header_name");

<强> 6。您需要覆盖活动或片段的onActivityResult方法，如下所示：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
     super.onActivityResult(requestCode, resultCode, data);
     magicalTakePhoto.resultPhoto(requestCode, resultCode, data);

     // example to get photo
     // imageView.setImageBitmap(magicalTakePhoto.getMyPhoto());
}

注意：只有使用此库，您才可以在设备中选择图片，这将使用最小的API 15。

Answer 4

将图像存储在所需的文件夹中

 //Global Variables
   private static final int CAMERA_IMAGE_REQUEST = 101;
    private String imageName;

拍照功能

 public void captureImage() {

            // Creating folders for Image
            String imageFolderPath = Environment.getExternalStorageDirectory().toString()
                    + "/AutoFare";
            File imagesFolder = new File(imageFolderPath);
            imagesFolder.mkdirs();

            // Generating file name
            imageName = new Date().toString() + ".png";

            // Creating image here
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(imageFolderPath, imageName)));
            startActivityForResult(takePictureIntent,
                    CAMERA_IMAGE_REQUEST);

        }

广播新图片，否则图片将无法在图片库中看到

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
                // TODO Auto-generated method stub
                super.onActivityResult(requestCode, resultCode, data);

                if (resultCode == Activity.RESULT_OK && requestCode == CAMERA_IMAGE_REQUEST) {

                    Toast.makeText(getActivity(), "Success",
                            Toast.LENGTH_SHORT).show();

 //Scan new image added
                    MediaScannerConnection.scanFile(getActivity(), new String[]{new File(Environment.getExternalStorageDirectory()
                            + "/AutoFare/" + imageName).getPath()}, new String[]{"image/png"}, null);


 // Work in few phones
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

                        getActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(Environment.getExternalStorageDirectory()
                                + "/AutoFare/" + imageName)));

                    } else {
                        getActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse(Environment.getExternalStorageDirectory()
                                + "/AutoFare/" + imageName)));
                    }
                } else {
                    Toast.makeText(getActivity(), "Take Picture Failed or canceled",
                            Toast.LENGTH_SHORT).show();
                }
            }

权限

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 5

For those who came here looking for a way to take pictures/photos programmatically using both Android's Camera and Camera2 API, take a look at the open source sample provided by Google itself here.

Answer 6

以下是打开相机的简单方法：

private void startCamera() {

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    intent.putExtra(MediaStore.EXTRA_OUTPUT,
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI.getPath());
    startActivityForResult(intent, 1);
}

Answer 7

Intent takePhoto = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(takePhoto, CAMERA_PIC_REQUEST)

并设置 CAMERA_PIC_REQUEST= 1 or 0

以编程方式在Android上用相机拍照

7 个答案: