从活动创建位图

Question

我对Android有点陌生。 但是对iOS开发了很多。

我有一个父活动（Activity1），它必须在后台加载和设置另一个活动（Activity2）。 然后，Activity2准备好了，它必须调用一个可以使用Activity2并返回位图图像的方法。（我需要此图像用于Facebook分享。）

所以我的问题是：

1.它如何启动第二个活动而不显示它

2如何进行第二项活动并将其作为位图返回

    public class Activity1 extends Activity implements OnClickListener, KKServerApiListener {

    private Activity2 facebookshareActivity;


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

      initView();


      /* Try 1 */
      facebookshareActivity = new KKFacebookShareActivity(route);
      /* Tried with some different things here */

      /* Try 2 */
      Intent myIntent = new Intent(this, KKFacebookShareActivity.class);
      myIntent.putExtra("number", route.id); 
      this.startActivity(myIntent);  
  }

  public void makeDialogShare(final Context context, final String str) {
        /*SETTING UP THE DIALOG */

        // ... //

        // ... //

        dialogButtonOk.setText("Share");
        dialogButtonOk.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(final View v) {

                /*  My try on getting my activity to a bitmap */
                View screenView = ****
                screenView.setDrawingCacheEnabled(true);
                Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
                screenView.setDrawingCacheEnabled(false);

                /* Haven't worked  on this part just something i pasted from facebook */
                SharePhoto photo = new SharePhoto.Builder()
                        .setBitmap(bitmap)
                        .build();
                SharePhotoContent content = new SharePhotoContent.Builder()
                        .addPhoto(photo)
                        .build();

                showDashboard(ctx, true);
                //finish();
            }
        });
        final Button dialogButtonCancel = (Button) dialog.findViewById(R.id.btnCancel);
        dialogButtonCancel.setText("Continue");
        dialogButtonCancel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(final View v) {
                dialog.dismiss();
                //finish();
            }
        });
        dialog.show();
    }
 }

Answer 1

如果您需要获取有关Activity2中内容的图像，则可以尝试扩大Activity的布局。 然后使用刚放大的视图创建一个位图，然后将其返回。 在您的代码中是这样的：

/*  My try on getting my activity to a bitmap */
        LayoutInflater inflater = LayoutInflater.from(getContext());
        View screenView = inflater.inflate(R.layout.your_activity_layout, null);

        // add views and set rules (same as in the XML) to screenView
        ...

        screenView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        screenView.layout(0, 0, screenView.getMeasuredWidth(), screenView.getMeasuredHeight());

        Bitmap bitmap = Bitmap.createBitmap(screenView.getMeasuredWidth(), screenView.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bitmap);
        screenView.draw(c);

        ...

            /* Haven't worked  on this part just something i pasted from facebook */
            SharePhoto photo = new SharePhoto.Builder()
                    .setBitmap(bitmap)
                    .build();
            SharePhotoContent content = new SharePhotoContent.Builder()
                    .addPhoto(photo)
                    .build();

            showDashboard(ctx, true);

R.layout.your_activity_layout是您要共享的布局。

注意：由于您是手动创建视图，因此可能需要添加一些视图并以编程方式设置配置，以便重新创建布局（视图的XML）。