android - Android按钮在表格布局中消失

Question

我有一个包含两个活动的应用程序。MainActivity加载一个 xml( printscreen.xml)，其中有两个按钮(print和close) 和一个webview. 当应用程序运行时，它会加载网页和两个位置正确的按钮。当我单击打印按钮时，它会转到另一个活动，当我返回主活动按钮时，它会消失（关闭按钮的某些部分）。

这是我的printscreen.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TableLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TableRow
        android:id="@+id/tableRow1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/top"
        android:gravity="center" >

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/btnClose"
                android:layout_width="80dp"
                android:layout_height="30dp"
                android:layout_alignParentLeft="true"
                android:layout_marginLeft="10dp"
                android:background="@drawable/btn"
                android:text="Close" />

            <Button
                android:id="@+id/btnPrint"
                android:layout_width="80dp"
                android:layout_height="30dp"
                android:layout_alignParentRight="true"
                android:layout_marginRight="10dp"
                android:background="@drawable/btn"
                android:text="Print" />

        </RelativeLayout>

    </TableRow>

    <TableRow
        android:id="@+id/tableRow2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" >

        <TableLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1" >

            <TableRow
                android:id="@+id/tableRow7"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1" >

                <WebView
                    android:id="@+id/webViewPrint"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1" />

            </TableRow>
        </TableLayout>

    </TableRow>
  </TableLayout>

</LinearLayout>

这是我的问题的屏幕截图：第一个是初始加载应用程序时（它是正确的）。第二个是回到 MainActivity（这是不正确的）。

这是我的主要活动：

public class VividViewerActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);

    mUnityPlayer = new UnityPlayer(this);
    context = this;
    View playerView = mUnityPlayer.getView();
    setContentView(playerView);
    playerView.requestFocus();
    mJSInterface = new JSInterface();
    mWebView = new WebView(this);

    FrameLayout layout = new FrameLayout(this);
    addContentView(layout, new LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.FILL_PARENT));
    layout.addView(mWebView, new FrameLayout.LayoutParams(
            LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
            Gravity.NO_GRAVITY));
    // Basic settings of WebView.

    mWebView.setBackgroundColor(Color.TRANSPARENT);

    WebSettings webSettings = mWebView.getSettings();
    webSettings.setSupportZoom(false);
    webSettings.setJavaScriptEnabled(true);
    webSettings.setPluginsEnabled(true);

    mWebView.setWebViewClient(new WebViewClient() {
    });


    pv = new PrintView(this, null);
    layout.addView(pv, new FrameLayout.LayoutParams(
            LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
            Gravity.NO_GRAVITY));
    mWebView.addJavascriptInterface(mJSInterface, "UnityInterface");
    pv.wev.addJavascriptInterface(mJSInterface, "UnityInterface");
    // Start in invisible state.
    mWebView.setVisibility(View.GONE);
    pv.setVisibility(View.GONE);
}

// reezo take picture
public void takePictureByCamera() {
    /*
     * //String path = Environment.getExternalStorageDirectory() +
     * "/CameraImages/example.jpg"; //File file = new File("image.jpg");
     * //Uri outputFileUri = Uri.fromFile( file ); Intent cameraIntent = new
     * Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
     * //cameraIntent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );
     * startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
     */

    Intent intent = new Intent(context, CustomCameraActivity.class);
    startActivity(intent);

}

// reezo open gallery
public void selectImageFromGallery() {
    Intent galleryIntent = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
    startActivityForResult(galleryIntent, ACTIVITY_SELECT_IMAGE);
}

public void updateWebView(final String lastRequestedUrl,
        final boolean loadRequest, final boolean visibility,
        final int leftMargin, final int topMargin, final int rightMargin,
        final int bottomMargin) {
    // Process load requests.
    if (lastRequestedUrl != null && (loadRequest || !mInitialLoad)) {
        runOnUiThread(new Runnable() {
            public void run() {
                Log.e("lastRequestedUrl", lastRequestedUrl);

                Log.e("cookie", "URL: " + lastRequestedUrl);
                Log.e("cookie", "RETRIEVE COOKIES FROM COOKIESTORE:");

                CookieSyncManager cookieSyncManager = CookieSyncManager
                        .createInstance(mWebView.getContext());
                CookieManager cookieManager = CookieManager.getInstance();
                cookieManager.setAcceptCookie(true);
                cookieManager.removeSessionCookie();

                List<Cookie> cookies = mHttpclient.getCookieStore()
                        .getCookies();
                if (cookies != null) {
                    for (Cookie cookie : cookies) {
                        String cookieString = cookie.getName() + "="
                                + cookie.getValue() + "; domain="
                                + cookie.getDomain();
                        cookieManager.setCookie(cookie.getDomain(),
                                cookieString);
                        Log.e("cookie", "  --" + cookie.getDomain() + " : "
                                + cookieString);
                    }
                }

                cookieSyncManager.sync();

                Log.e("cookie", "NOW! WEBVIEW URL=" + lastRequestedUrl);
                mWebView.loadUrl(lastRequestedUrl);

                isWebsiteLoaded = true;
                // mWebView.loadUrl("file:///android_asset/index.html");

            }
        });
        mInitialLoad = true;
    }
    // Process changes in margin amounts
    if (leftMargin != mLeftMargin || topMargin != mTopMargin
            || rightMargin != mRightMargin || bottomMargin != mBottomMargin) {
        mLeftMargin = leftMargin;
        mTopMargin = topMargin;
        mRightMargin = rightMargin;
        mBottomMargin = bottomMargin;
        runOnUiThread(new Runnable() {
            public void run() {
                // Apply a new layout to the WebView.
                FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                        LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
                        Gravity.NO_GRAVITY);
                params.setMargins(mLeftMargin, mTopMargin, mRightMargin,
                        mBottomMargin);
                mWebView.setLayoutParams(params);
            }
        });
    }

    // Process changes in visibility.
    if (visibility != (mWebView.getVisibility() == View.VISIBLE)) {
        runOnUiThread(new Runnable() {
            public void run() {
                if (visibility) {
                    // Show and set focus.
                    mWebView.setVisibility(View.VISIBLE);

                    mWebView.requestFocus();
                } else {
                    // Hide.
                    mWebView.setVisibility(View.GONE);
                }
            }
        });
    }

}

public void setCookie(String cookie) {
    Log.e("cookie", "FROM UNITY: setCookie(): OBSOLATE!!!" + cookie);
    this.mCookie = cookie;
}

// reezo call javascript function
public void callJavascriptFunction(final String unityMessage) {
    Log.e("unity Message", unityMessage);

    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            mWebView.loadUrl("javascript:alert(" + unityMessage + ")");
        }
    });

}

public String getPollDeviceAttitude() {

    return Constant.rotationValueForCamera;
}

public int getImagePickerStatus() {

    Log.e("ImagePickerStatus", Constant.imagePickerStatus
            + "    mmmmmmmmmmmmmmmmmmmmm");

    if (Constant.imagePickerStatus == 0) {
        Constant.imagePickerStatus = -1;

        return 0;
    } else if (Constant.imagePickerStatus == 1) {
        Constant.imagePickerStatus = -1;

        return 1;
    }

    return Constant.imagePickerStatus;
}

public void loadPrintActivity(String printUrl) {
    Log.e("JMK", "loadPrintActivity " + printUrl);

    /*
     * Intent iPrintActivity = new Intent(context, PrintActivity.class);
     * Constant.printUrl = printUrl; Constant.isPrintButtonVisible =true;
     * startActivity(iPrintActivity);
     */
    WebSettings webSettings = pv.wev.getSettings();
    webSettings.setSupportZoom(true);
    webSettings.setJavaScriptEnabled(true);
    webSettings.setPluginsEnabled(true);
    pv.wev.setWebViewClient(new WebViewClient() {
    });
    pv.wev.loadUrl(printUrl);
    runOnUiThread(new Runnable() {
        public void run() {
            // Show and set focus.
            pv.setVisibility(View.VISIBLE);
            pv.btnPrint.setVisibility(View.VISIBLE);
            pv.setClickable(true);
            pv.requestFocus();
        }
    });
    pv.btnClose.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Log.e("VIEWWWWWWWWWWWWWWWWWWWWW", "kaj korce..............");
            pv.setVisibility(View.INVISIBLE);
        }
    });

    pv.btnPrint.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Log.e("VIEWWWWWWWWWWWWWWWWWWWWW", "kaj korce..............");

            runOnUiThread(new Runnable() {
                public void run() {
                    // Show and set focus.
                    pv.btnPrint.setVisibility(View.INVISIBLE);
                    //String mPath = Environment
                            //.getExternalStorageDirectory().toString()
                        //  + "/"
                            //+ "dse.jpg";
                    /*
                     * Bitmap bitmap; View v1 = pv.wev.getRootView();
                     * v1.setDrawingCacheEnabled(true);
                     * 
                     * bitmap = Bitmap.createBitmap(v1.getDrawingCache());
                     * v1.setDrawingCacheEnabled(false); OutputStream fout =
                     * null; File imageFile = new File(mPath); try { fout =
                     * new FileOutputStream(imageFile);
                     * bitmap.compress(Bitmap.CompressFormat.JPEG, 40,
                     * fout); fout.flush(); fout.close();
                     * 
                     * } catch (FileNotFoundException e) { // TODO
                     * Auto-generated catch block e.printStackTrace(); }
                     * catch (IOException e) { // TODO Auto-generated catch
                     * block e.printStackTrace(); }
                     */

                    Picture picture = pv.wev.capturePicture();

                    Bitmap b = Bitmap.createBitmap(picture.getWidth(),
                            picture.getHeight(), Bitmap.Config.ARGB_8888);

                    Canvas c = new Canvas(b);
                    picture.draw(c);

                    ByteArrayOutputStream out = null;
                    byte[] byteArchadeImage = null;
                    try {
                        out = new ByteArrayOutputStream();

                        if (out != null) {
                            b.compress(Bitmap.CompressFormat.JPEG, 100, out);
                            byteArchadeImage = out.toByteArray();
                            out.flush();
                            out.close();
                        }
                    } catch (Exception e) {
                        Log.e("MSG", e.getLocalizedMessage());
                    }

                    Document document = new Document();
                    try {
                        PdfWriter.getInstance(document,
                                new FileOutputStream(Environment
                                        .getExternalStorageDirectory()
                                        .toString()
                                        + "/" + "dse.pdf"));
                        document.open();
                        //document.add(new Paragraph("This Is For You!!!!"));
                        try {

                            Image image = Image.getInstance(byteArchadeImage);

                            image.scaleAbsolute(600,
                            800);
                            image.setAlignment(Image.MIDDLE |Image.ALIGN_MIDDLE);
                            document.add(image);
                        } catch (MalformedURLException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (DocumentException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    document.close();
                    Intent printIntent = new Intent(
                            VividViewerActivity.this,
                            PrintDialogActivity.class);
                    Uri uri = Uri.fromFile(new File(Environment
                            .getExternalStorageDirectory().toString()
                            + "/"
                            + "dse.pdf"));
                    printIntent.setDataAndType(uri, "application/pdf");
                    // printIntent.putExtra(Intent.EXTRA_STREAM,
                    // Uri.fromFile(new
                    // File(ur)));
                    String time = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                    printIntent.putExtra("title", "vividworks_report_"+time+".pdf");
                    startActivity(printIntent);
                }
            });
        }
    });
}

private int dpToPx(int dp) { float density =
         getApplicationContext().getResources() .getDisplayMetrics().density;
         return Math.round((float) dp * density); }

public void LoadPrintActivityWithOutPrint(String printUrl) {
    Log.e("JMK", "LoadPrintActivityWithOutPrint " + printUrl);

    /*
     * Intent iPrintActivity = new Intent(context, PrintActivity.class);
     * Constant.printUrl = printUrl; Constant.isPrintButtonVisible =false;
     * startActivity(iPrintActivity);
     */

    WebSettings webSettings = pv.wev.getSettings();
    webSettings.setSupportZoom(true);
    webSettings.setJavaScriptEnabled(true);
    webSettings.setPluginsEnabled(true);
    pv.wev.setWebViewClient(new WebViewClient() {
    });
    pv.wev.loadUrl(printUrl);
    runOnUiThread(new Runnable() {
        public void run() {
            // Show and set focus.
            pv.setVisibility(View.VISIBLE);
            pv.btnPrint.setVisibility(View.INVISIBLE);
            pv.setClickable(true);
            pv.requestFocus();
        }
    });
    pv.btnClose.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Log.e("VIEWWWWWWWWWWWWWWWWWWWWW", "kaj korce..............");
            pv.setVisibility(View.INVISIBLE);
        }
    });

}

public void loadNewWebPage(String webPage) {
    Log.e("jari", "loadNewWebPage " + webPage);

    // Constant.printUrl = "https://www.facebook.com/";
    Constant.printUrl = webPage;

    pv.wev.loadUrl(Constant.printUrl);
}
  protected void onDestroy ()
{
    super.onDestroy();
    mUnityPlayer.quit();
}

// onPause()/onResume() must be sent to UnityPlayer to enable pause and resource recreation on resume.
protected void onPause()
{
    super.onPause();
    mUnityPlayer.pause();
    if (isFinishing())
        mUnityPlayer.quit();
}
protected void onResume()
{
    super.onResume();
    mUnityPlayer.resume();}

关闭按钮（在第二张图片中）在返回 mainactivity 后如何占据相同的位置。请帮我。

我的解决方案：

仅更改布局文件。这是更新的 XML 文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TableLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TableRow
        android:id="@+id/tableRow1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/top"
        android:gravity="center" >

        <TableLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <TableRow
                android:id="@+id/tableRow3"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content" >

                <RelativeLayout
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="1" >

                    <Button
                        android:id="@+id/btnClose"
                        android:layout_width="80dp"
                        android:layout_height="30dp"
                        android:layout_alignParentLeft="true"
                        android:layout_marginLeft="10dp"
                        android:background="@drawable/btn"
                        android:text="Close" />

                    <Button
                        android:id="@+id/btnPrint"
                        android:layout_width="80dp"
                        android:layout_height="30dp"
                        android:layout_alignParentRight="true"
                        android:layout_marginRight="10dp"
                        android:background="@drawable/btn"
                        android:text="Print" />
                </RelativeLayout>

            </TableRow>
        </TableLayout>

    </TableRow>

    <TableRow
        android:id="@+id/tableRow2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" >

        <TableLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1" >

            <TableRow
                android:id="@+id/tableRow7"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1" >

                <WebView
                    android:id="@+id/webViewPrint"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_weight="1" />

            </TableRow>
        </TableLayout>

    </TableRow>
</TableLayout>

Answer 1

//try this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TableRow
            android:id="@+id/tableRow1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/top"
            android:gravity="center" >

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" >

                <Button
                    android:id="@+id/btnClose"
                    android:layout_width="80dp"
                    android:layout_height="30dp"
                    android:layout_alignParentLeft="true"
                    android:layout_marginLeft="10dp"
                    android:background="@drawable/btn"
                    android:text="Close" />

                <Button
                    android:id="@+id/btnPrint"
                    android:layout_width="80dp"
                    android:layout_height="30dp"
                    android:layout_alignParentRight="true"
                    android:layout_marginRight="10dp"
                    android:background="@drawable/btn"
                    android:text="Print" />

            </RelativeLayout>

        </TableRow>

        <TableRow
            android:id="@+id/tableRow2"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1" >

            <WebView
                android:id="@+id/webViewPrint"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </TableRow>
    </TableLayout>
</LinearLayout>

Answer 2

您是否尝试过类似的方法：

protected void onResume() {
   super.onResume();
   pv.btnPrint.setVisibility(View.INVISIBLE);
}

您的 pv 视图是在 onCreate 方法之外定义的，它应该可以工作......

Answer 3

您在 xml 中使用权重的方式是错误的。当您使用重量时，您必须将布局宽度/布局高度设置为 0dp