Question

我有两个Linearlayouts（A和B），其可见性在我的xml布局中互相排斥。当A可见时，B是GONE（android:visibility="gone"），反之亦然。两个LinearLayout都包含一个ImageView。我有一个按钮，截取当前屏幕的截图。

最初A是可见的，B是Gone。按下上面的按钮应该使B可见并且A消失，然后截取屏幕截图并将生成的图像保存在SD卡中。我没有在图像中看到B。 A仍然可见。

android代码如下：

 public class AScreenshotActivity extends Activity {

    LinearLayout zoomed_image,first_set;
    Button screenshot;

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

        zoomed_image=(LinearLayout)findViewById(R.id.zoomed_image);
        first_set=(LinearLayout)findViewById(R.id.first_set);
        screenshot=(Button)findViewById(R.id.button1);

        screenshot.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if(first_set.getVisibility()==View.GONE){
                    first_set.setVisibility(View.VISIBLE);
                    zoomed_image.setVisibility(View.GONE);
                }

                if(zoomed_image.getVisibility()==View.GONE){

                    zoomed_image.setVisibility(View.VISIBLE);
                    first_set.setVisibility(View.GONE);
                }

                 Bitmap bitmap = takeScreenshot();
                 saveBitmap(bitmap);

            }
        });
    }

private void saveBitmap(Bitmap bitmap) {

        File imagePath = new File(Environment.getExternalStorageDirectory()+ File.separator + "screenshot.png");
        FileOutputStream fos;

        if(imagePath.exists()){
            imagePath.delete();
        }

        if(!imagePath.exists()) {
            try {
                imagePath.createNewFile();
                Toast.makeText(this, "CAPTURING SCREENSHOT !", Toast.LENGTH_LONG).show();

            } catch (IOException e) {

                Log.e("FILE INPUT FOR SCREENSHOT NOT CREATED", e.getMessage(), e);
            }
        } 
            try {
                fos = new FileOutputStream(imagePath);
                bitmap.compress(CompressFormat.JPEG, 20, fos);

               fos.flush();
               fos.close();
            } catch (FileNotFoundException e) {
                Log.e("FILE NOT FOUND - SCREENSHOT", e.getMessage(), e);
            } catch (IOException e) {
                Log.e("FILE INPUT FOR SCREENSHOT NOT FOUND", e.getMessage(), e);
            }
    }

    private Bitmap takeScreenshot() {
         //View rootView = context.findViewById(android.R.id.content).getRootView();

        View rootView = getWindow().getDecorView().getRootView();
          rootView.setDrawingCacheEnabled(true);
           return rootView.getDrawingCache();
    }
}

The xml layout is as follows:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:orientation="vertical"
                 >  

    <LinearLayout  
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
                 android:id="@+id/zoomed_image"
    >   


            <ImageView
                 android:id="@+id/imgzoom_large"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
                 android:src="@drawable/pack01_11" 
             />

        </LinearLayout>    


         <LinearLayout
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:orientation="vertical"
                 android:visibility="gone"
                 android:id="@+id/first_set"
                  >

              <ImageView
                    android:id="@+id/image1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:src="@drawable/pack01_12"
                    />



                </LinearLayout>     

              <Button
                    android:layout_width="wrap_content"
                    android:id="@+id/button1"
                    android:layout_height="wrap_content"
                    android:text="Button screenshot"
             ></Button>   
            </LinearLayout> 

         What is the mistake?? Please help. Thanks A LOT

我的错是什么？请回复。

Answer 1

已编辑＆gt;＆gt;＆gt;＆gt;＆gt;测试此工作正常确保您的视图适合屏幕

 if(first_set.getVisibility()!= View.VISIBLE){
                    zoomed_image.setVisibility(View.GONE);
                    first_set.setVisibility(View.VISIBLE);
                }else if(zoomed_image.getVisibility() != View.VISIBLE){
                    first_set.setVisibility(View.GONE);
                    zoomed_image.setVisibility(View.VISIBLE);

                }

Answer 2

use this one
if(first_set.getVisibility()==View.GONE){
                first_set.setVisibility(View.VISIBLE);
                zoomed_image.setVisibility(View.GONE);
            }else {

           // if(zoomed_image.getVisibility()==View.GONE){

                zoomed_image.setVisibility(View.VISIBLE);
                first_set.setVisibility(View.GONE);
            }

Android截图编程错误

2 个答案: