以编程方式在Android上用相机拍照

Question

我用按钮创建了一个应用程序,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,不拍照.我想要一些代码可以放在我的onClickListener中,所以当我按下屏幕上的按钮时,会拍摄一张照片.

当我在Android活动中按下按钮时,如何让相机拍照？

Answer 1

请看下面的演示代码.

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

拍照有两种方法:

1 - 使用Intent制作照片

2 - 使用相机API

我认为你应该使用第二种方式,这里有两个示例代码.

Answer 3

您可以使用Magical Take Photo库。

1.在gradle中尝试编译

compile 'com.frosquivel:magicaltakephoto:1.0'

2.您需要在manifest.xml中获得此权限

<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"/>

3.实例这样的类

//“ this”是当前的活动参数

MagicalTakePhoto magicalTakePhoto =  new MagicalTakePhoto(this,ANY_INTEGER_0_TO_4000_FOR_QUALITY);

4.如果需要拍照使用方法

magicalTakePhoto.takePhoto("my_photo_name");

5.如果需要在设备中选择图片，请尝试以下方法：

magicalTakePhoto.selectedPicture("my_header_name");

6.您需要像这样重写活动或片段的onActivityResult方法：

@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：只有使用此图库，您才能在设备中拍照并选择图片，这使用的是最小API 15。