我正在使用意图新Intent（MediaStore.ACTION_IMAGE_CAPTURE）; 来捕获要在我的应用程序中使用的图像。我的设备上安装了两个可以执行此功能的应用程序，但希望我的应用程序只使用默认摄像头。
有没有办法做到这一点？
答案 0 :(得分：4)
正如Dr_sulli建议的那样，我只是将其转换为代码并且它对我很有用，如果要访问直接相机应用程序，则部分允许用户选择其他相机应用程序以及系统相机。
protected static final int CAMERA_ACTIVITY = 100;
Intent mIntent = null;
if(isPackageExists("com.google.android.camera")){
mIntent= new Intent();
mIntent.setPackage("com.google.android.camera");
mIntent.setAction(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
mIntent.putExtra("output", Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), "/myImage" + ".jpg")));
}else{
mIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
mIntent.putExtra("output", Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), "/myImage" + ".jpg")));
Log.i("in onMenuItemSelected",
"Result code = "
+ Environment.getExternalStorageDirectory());
}
startActivityForResult(mIntent, CAMERA_ACTIVITY);
在onActivityResult里面做你的东西
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
Log.i("in onActivityResult", "Result code = " + resultCode);
if (resultCode == -1) {
switch (requestCode) {
case CAMERA_ACTIVITY:
//do your stuff here, i am just calling the path of stored image
String filePath = Environment.getExternalStorageDirectory()
+ "/myImage" + ".jpg";
}
}
}
isPackageExists将确认包是否存在。
public boolean isPackageExists(String targetPackage){
List<ApplicationInfo> packages;
PackageManager pm;
pm = getPackageManager();
packages = pm.getInstalledApplications(0);
for (ApplicationInfo packageInfo : packages) {
if(packageInfo.packageName.equals(targetPackage)) return true;
}
return false;
}
或者你可以通过我的方式更容易地做到这一点，这将过滤所有系统应用程序，然后你比较名称因此它适用于所有手机但由于硬编码的上述技术不适用于每部手机。稍后您可以使用此包名称来启动相机活动，如上所述。
PackageManager pm = this.getPackageManager();
List<ApplicationInfo> list = getPackageManager().getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
for (int n=0;n<list.size();n++) {
if((list.get(n).flags & ApplicationInfo.FLAG_SYSTEM)==1)
{
Log.d("Installed Applications", list.get(n).loadLabel(pm).toString());
Log.d("package name", list.get(n).packageName);
if(list.get(n).loadLabel(pm).toString().equalsIgnoreCase("Camera"))
break;
}
}
答案 1 :(得分：2)
List<ApplicationInfo> list = packageManager.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
for (int n=0;n<list.size();n++) {
if((list.get(n).flags & ApplicationInfo.FLAG_SYSTEM)==1)
{
Log.d("TAG", "Installed Applications : " + list.get(n).loadLabel(packageManager).toString());
Log.d("TAG", "package name : " + list.get(n).packageName);
if(list.get(n).loadLabel(packageManager).toString().equalsIgnoreCase("Camera")) {
defaultCameraPackage = list.get(n).packageName;
break;
}
}
}
我发现以下解决方案及其完美运作。
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureIntent.setPackage(defaultCameraPackage);
startActivityForResult(takePictureIntent, actionCode);
您可以通过在上面的意图中设置包来过滤默认相机。我已经通过安装两个应用程序 Line Camera 和 Paper Camera 进行了测试，这两个应用程序都显示了选择器但是通过过滤包上面的代码只打开默认相机。
答案 2 :(得分：0)
我不确定您要完成的是在所有设备上都可移植。 Android的一个目标是允许轻松替换服务请求（如图像捕获）的活动。话虽如此，如果您只想为您的设备执行此操作，您只需将意图中的组件名称设置为媒体捕获活动的名称即可。
答案 3 :(得分：0)
默认的相机应用是第一个安装的应用。因此，camlist中的第一个元素是默认应用
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
PackageManager packageManager = MapsActivity.this.getPackageManager();
List<ResolveInfo> listCam = packageManager.queryIntentActivities(intent, 0);
intent.setPackage(listCam.get(0).activityInfo.packageName);
startActivityForResult(intent,INTENT_REQUESTCODE1);
答案 4 :(得分：0)
我准备了一个几乎可以在所有解决方案中使用的解决方案：
3
0
0
0
0
0
0
0
0
0
0
0
0
106
-8
64
您可能需要在onCreate方法中放置以下代码：
private void openCamera() {
String systemCamera;
if (isPackageExists("com.google.android.camera")) {
systemCamera = "com.google.android.camera";
} else {
systemCamera = findSystemCamera();
}
if (systemCamera != null) {
Log.d(TAG, "System Camera: " + systemCamera);
Intent mIntent = new Intent();
mIntent.setPackage(systemCamera);
File f = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), ("IMG_" + new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()) + ".jpg"));
mIntent.setAction(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
mIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(mIntent, IMAGE_CODE_PICKER);
} else {
//Unable to find default camera app
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == IMAGE_CODE_PICKER && resultCode == RESULT_OK) {
}
}
private boolean isPackageExists(String targetPackage) {
List<ApplicationInfo> packages;
PackageManager pm;
pm = getPackageManager();
packages = pm.getInstalledApplications(0);
for (ApplicationInfo packageInfo : packages) {
if (packageInfo.packageName.equals(targetPackage)) {
return true;
}
}
return false;
}
private String findSystemCamera() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
PackageManager packageManager = this.getPackageManager();
List<ResolveInfo> listCam = packageManager.queryIntentActivities(intent, 0);
for (ResolveInfo info :
listCam) {
if (isSystemApp(info.activityInfo.packageName)) {
return info.activityInfo.packageName;
}
}
return null;
}
boolean isSystemApp(String packageName) {
ApplicationInfo ai;
try {
ai = this.getPackageManager().getApplicationInfo(packageName, 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
return false;
}
int mask = ApplicationInfo.FLAG_SYSTEM | ApplicationInfo.FLAG_UPDATED_SYSTEM_APP;
return (ai.flags & mask) != 0;
}