我创建了一个带有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，但都没有工作。他们都调出安卓相机应用程序，不拍照。我想要一些可以放入我的 onClickListener 的代码，这样当我按下屏幕上的按钮时，就会拍摄一张照片。
当我在 Android Activity 中按下按钮时，如何让相机拍照？
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7 回答
100
看下面的演示代码。
这是您用于 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");
}
}
}
笔记：
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"/>
于 2013-01-20T04:59:53.650 回答
31
于 2013-01-20T04:40:54.583 回答
6
您可以使用神奇的照片库。
1.尝试在gradle中编译
compile 'com.frosquivel:magicaltakephoto:1.0'
2. 您的 manifest.xml 中需要此权限
<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.像这样实例化类
// "this" 是当前活动参数
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.你需要像这样覆盖activity或fragment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：只有使用此库，您才能在设备中拍摄和选择图片，这使用最低 API 15。
于 2016-05-16T22:54:38.113 回答
2
拍摄图像并将其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);
}
广播添加了新图片，否则图片将在图片库中不可见
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" />
于 2017-01-11T04:48:56.980 回答
2
对于那些来这里寻找一种使用 Android 的 Camera 和 Camera2 API 以编程方式拍摄照片/照片的方法的人，请在此处查看 Google 本身提供的开源示例。
于 2017-04-10T02:22:41.600 回答
-1
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);
}
于 2014-08-05T05:59:09.620 回答
-4
Intent takePhoto = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(takePhoto, CAMERA_PIC_REQUEST)
并设置
CAMERA_PIC_REQUEST= 1 or 0
于 2016-03-20T06:41:34.630 回答