小编Tom*_*Tom的帖子

在我的相机应用程序中,我有一个按钮可以将相机面向前方或后方更改,我可以使用后置相机捕捉和保存图像,但是当我切换到前置相机时,我无法捕捉图像.这就是我将相机切换到前面或后面的方式.

   ImageView switch_camera =(ImageView) rootview.findViewById(R.id.imageView7);
        switch_camera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


         //       facing = characteristics.get(CameraCharacteristics.LENS_FACING);

                if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {
                    //isfrontcam=true;
                    try {

                        //manager.openCamera(getBackFacingCameraId(manager), mStateCallback, mBackgroundHandler);
                        closeCamera();
                        openCamera(mTextureView.getWidth(), mTextureView.getHeight(),"0");
                        Log.e("opening ","BackCam");
                        facing = 1;

                    } catch (SecurityException e) {
                        e.printStackTrace();

                    } catch (Exception e) {
                        e.printStackTrace();

                    }
                } else if (facing != null && facing == CameraCharacteristics.LENS_FACING_BACK) {
                    //  isfrontcam = true;
                    try {
                        //manager.openCamera(getFrontFacingCameraId(manager), mStateCallback, mBackgroundHandler);

                      //  characteristics = manager.getCameraCharacteristics("1");

                        closeCamera();
                        openCamera(mTextureView.getWidth(), …

在我的应用程序中，我在按钮单击事件上创建了一个 PDF 文档。并且我使用了打印框架来打印该文档。所有这些都工作正常。我需要的是，我想将该 pdf 文档保存到手机存储中的文件夹中.如何做到这一点，我不知道如何将此 pdf 保存到文件中。有人可以帮我吗？提前谢谢。

我的生成pdf的代码

public class CustomPrintActivity extends Activity {





@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_custom_print);
}



public void printDocument(View view)
{
    PrintManager printManager = (PrintManager) this
            .getSystemService(Context.PRINT_SERVICE);

    String jobName = this.getString(R.string.app_name) +
            " Document";

    printManager.print(jobName, new MyPrintDocumentAdapter(this),
            null);
}
public class MyPrintDocumentAdapter extends PrintDocumentAdapter {
    Context context;
    private int pageHeight;
    private int pageWidth;
    public PdfDocument myPdfDocument;
    public int totalpages = 1;


    public MyPrintDocumentAdapter(Context context) {
        this.context = context;
    }

    @Override
    public void onLayout(PrintAttributes …