Android：无法在 Camera.open() 处连接到相机服务；
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Android: Fail to connect to camera service at Camera.open();
提问by Archie.bpgc
There are many questions similar to this, but none helped me:
有很多与此类似的问题，但没有一个对我有帮助：
my manifest file is:
我的清单文件是：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.cameraapi"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".CameraAPIActivity"
android:label="@string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
my Activity class is:
我的活动课是：
public class CameraAPIActivity extends Activity {
private Camera myCamera = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (checkCameraHardware(this)) {
try {
myCamera = Camera.open();
} catch (Exception e) {
//Here i get the Exception: Failed to connect to camera service
}
}
}
private boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
i get the Exception at the line
我得到了该行的异常
myCamera = Camera.open();
Thank You
谢谢你
回答by Archie.bpgc
Forgot to add
忘记添加了
myCamera.release();
in my code. hence it works for the first time i launch the application. When i re-launch it the Camera service is not available.
在我的代码中。因此它在我第一次启动应用程序时有效。当我重新启动它时，相机服务不可用。
回答by Royston Pinto
You will need to add the following
您将需要添加以下内容
private Preview mPreview; // Global variable
mPreview = new Preview(this); // onCreate()
setContentView(mPreview); // onCreate()
Hope this helps!
希望这可以帮助！
回答by Peter Miller
You imported the wrong camera class at the top of your source file (I sink that), which is android.graphics.Camera.
您在源文件的顶部导入了错误的相机类（我认为是），即android.graphics.Camera.
You need android.hardware.Camerainstead.
你需要android.hardware.Camera代替。
After:
后：
myCamera = Camera.open(); - start working.
回答by Aamir Shah
If you want to take a pic from camera use
如果你想用相机拍照
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);`
also add this function
也添加这个功能
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST) {
photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
}
}
imageView is the View where you may want to set that captured image.
imageView 是您可能想要设置捕获图像的视图。
