我可以强制我的应用程序启动默认相机而不是提供“使用完成操作”吗？列表？

Question

我正在使用意图 new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 来捕获图像以在我的应用程序中使用。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仅使用默认摄像头。

有办法做到这一点吗？

Answer 1

正如 Dr_sulli 所建议的，我只是将其转换为代码，它对我来说效果很好，如果需要访问直接相机应用程序，其他部分是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 中做你的事情

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;
}

或者您可以按照我的方式进行操作，这要容易得多，这将过滤所有系统应用程序，然后您比较名称，因此它适用于所有手机，但由于硬编码，上述技术并不适用于每部手机。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;
        }
    }

Answer 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工作完美。

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。我通过安装两个应用程序线相机和纸相机进行了测试，这两个应用程序都显示选择器，但按上面的代码包仅打开默认相机。

Answer 3

我准备了一个适用于几乎所有解决方案的解决方案：

  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;
    }

您可能需要在 onCreate 方法中添加以下代码：

StrictMode.VmPolicy.Builder newbuilder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(newbuilder.build());

Answer 4

我不确定您想要完成的任务是否可以跨所有设备移植。 Android 的目标之一是允许轻松替换服务请求（例如图像捕获）的活动。话虽这么说，如果您只想为您的设备执行此操作，您可以简单地将意图中的组件名称设置为媒体捕获活动的名称。

Answer 5

默认相机应用程序是安装的第一个应用程序。因此，camlist 中的第一个元素是默认应用程序

    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);