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？
答案 0 :(得分：96)
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"/>
答案 1 :(得分：29)
答案 2 :(得分：5)
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。
答案 3 :(得分：2)
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" />
答案 4 :(得分：2)
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.
答案 5 :(得分：-2)
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);
}
答案 6 :(得分：-4)
Intent takePhoto = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(takePhoto, CAMERA_PIC_REQUEST)
并设置
CAMERA_PIC_REQUEST= 1 or 0