Fortschrittsbalken nicht angezeigt, während auf die Schaltfläche klicken, um PDF zu erstellen

Question

Warum Fortschrittsbalken angezeigt wird, bevor ich auf die Schaltfläche zum Erstellen von PDF klicken? Ich hoffe, dass Sie mir helfen können.

Ich möchte, dass die Fortschrittsanzeige während der Erstellung der PDF-Datei angezeigt wird.

ich bin nicht in der Lage CreatePDF() und ViewPDF() in Thread einfügen Fortschrittsbalken bei der Erstellung PDF zeigen ....

public class TwoFragment extends android.support.v4.app.Fragment {  
    private View v; 
    Intent chooser=null; 
    String myInt=""; 
    String ciao=""; 
    private String string=""; 
    private ProgressBar pdfProgress; 

    public TwoFragment() { 
     // Required empty public constructor 
    }  

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 

     View rootView = inflater.inflate(R.layout.fragment_two, container, false);  
     Button mButton = (Button) rootView.findViewById(R.id.newbutton); 
     mButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) {  
       //sendemail(); 
       pdfProgress.setVisibility(View.VISIBLE); 
       createPDF(); 
       pdfProgress.setVisibility(View.GONE); 
       viewPDF();  
      } 
     }); 
     TextView titolo3 = (TextView)rootView.findViewById(R.id.result); 
     TextView titolo2 = (TextView)rootView.findViewById(R.id.result2); 
     TextView titolo4 = (TextView)rootView.findViewById(R.id.resultpizze); 
     pdfProgress = (ProgressBar)rootView.findViewById(R.id.progressbar); 
     //pdfProgress.setVisibility(View.GONE);  
     //TextView titolo = (TextView)rootView.findViewById(R.id.quantità3); 

     Bundle bundle2=getArguments(); 
     if(bundle2 != null){ 
      string = bundle2.getString("scelta2"); 
      titolo3.setText(string); 

     } 

    /* Bundle bundle2=getArguments(); 
     if(bundle2 != null){ 
      // myInt = bundle2.getString("scelta2",myInt); 
      cacca=bundle2.getString("result",null); 

      //cacca=myInt; 
      // Log.d("ciao",cacca); 
      titolo3.setText(cacca); 
     }*/ 

     //titolo3.setText(myInt); 


    /* Bundle bundle3=getArguments(); 
     if(bundle3 != null){ 
      // String myInt3 = bundle3.getString("totalebirre", null); 
      // cazzo2=Integer.parseInt(myInt3); 
      int cazzo2=bundle3.getInt("totalebirre"); 
      titolo2.setText(String.valueOf(cazzo2)); 



     } 
     Bundle bundle=getArguments(); 
     if(bundle != null){ 
      // String myInt2 = bundle2.getString("totalepizze", null); 
      // cazzo=Integer.parseInt(myInt2); 
      //titolo2.setText(myInt2); 
      String string=bundle.getString("scelta3", null); 
      titolo4.setText(string); 

     } 
*/ 


     return rootView; 
    } 


/* public void sendemail(){ 

     Intent intent = new Intent(Intent.ACTION_SEND); 
     intent.setData(Uri.parse("mailto:")); 
     String[] to={"marco_marcoletto@hotmail.it"}; 
     intent.putExtra(Intent.EXTRA_EMAIL,to); 
     intent.putExtra(Intent.EXTRA_SUBJECT, "ciao"); 
     intent.putExtra(Intent.EXTRA_TEXT, "zao"); 
     intent.setType("message/rfc822"); 
     chooser=intent.createChooser(intent,"manda email"); 
     startActivity(chooser); 
    }*/ 

    //@TargetApi(Build.VERSION_CODES.M) 
    public void createPDF() { 

     Document doc = new Document(); 

     try { 
      String path = Environment.getExternalStorageDirectory() 
        .getAbsolutePath() + "/droidText"; 

      File dir = new File(path); 
      if (!dir.exists()) 
       dir.mkdirs(); 

      Log.d("PDFCreator", "PDF Path: " + path); 

      //File file = new File(dir, "sample.pdf"); 
      File file = new File(dir, "salve.pdf"); 

      FileOutputStream fOut = new FileOutputStream(file); 

      PdfWriter.getInstance(doc, fOut); 

      // open the document 
      doc.open(); 
      ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
      Bitmap bitmap = BitmapFactory.decodeResource(getContext() 
        .getResources(), R.drawable.androtuto); 
      bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
      Image myImg = Image.getInstance(stream.toByteArray()); 
      myImg.setAlignment(Image.MIDDLE); 

      // add image to document 
      doc.add(myImg); 
      Paragraph p1 = new Paragraph(string); 
      Font paraFont = new Font(Font.COURIER); 
      p1.setAlignment(Paragraph.ALIGN_CENTER); 
      p1.setFont(paraFont); 




      // add paragraph to document 
      doc.add(p1); 

      Paragraph p2 = new Paragraph("Bonjour Android Tuto"); 

      Font paraFont2 = new Font(Font.COURIER, 14.0f, Color.GREEN); 
      p2.setAlignment(Paragraph.ALIGN_CENTER); 
      p2.setFont(paraFont2); 

      doc.add(p2); 


      stream = new ByteArrayOutputStream(); 
      bitmap = BitmapFactory.decodeResource(getContext() 
        .getResources(), R.drawable.android); 
      bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
      myImg = Image.getInstance(stream.toByteArray()); 
      myImg.setAlignment(Image.MIDDLE); 

      // add image to document 
      doc.add(myImg); 

      // set footer 
      Phrase footerText = new Phrase("Pied de page "); 
      HeaderFooter pdfFooter = new HeaderFooter(footerText, false); 
      doc.setFooter(pdfFooter); 

     } catch (DocumentException de) { 
      // Log.e("PDFCreator", "DocumentException:" + de); 
      Log.e("PDFCreator", "DocumentException:" + de.getMessage()); 
     } catch (IOException e) { 
     // Log.e("PDFCreator", "ioException:" + e); 
      Log.e("PDFCreator", "DocumentException:" + e.getMessage()); 


     } finally { 
      doc.close(); 
     } 

    } 
    public void viewPDF(){ 
     String path = "/sdcard/droidText/salve.pdf"; 

     File targetFile = new File(path); 
     Uri targetUri = Uri.fromFile(targetFile); 

     Intent intent; 
     intent = new Intent(Intent.ACTION_VIEW); 
     intent.setDataAndType(targetUri, "application/pdf"); 

     startActivity(intent); 
    } 

} 

XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin"> 
    <ProgressBar 
     android:id="@+id/progressbar" 
     style="?android:attr/progressBarStyleLarge" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:visibility="gone" 
     android:layout_centerInParent="true" 
     /> 
    <ScrollView 
     android:id="@+id/scrollView1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 

     android:layout_centerHorizontal="true" > 

    <LinearLayout 
     android:id="@+id/LinearLayout1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" > 
<!--<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fillViewport="true">--> 
    <!-- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/linearLayout2" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:orientation="vertical" 
     android:weightSum="1"> 
     <TextView 
      android:id="@+id/result2" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:capitalize="characters" 
      android:layout_centerVertical="false" 
      android:layout_marginTop="30dp" 
      android:textSize="30dp"/> 

     <TextView 
      android:id="@+id/quantità2" 
      android:layout_width="100dp" 
      android:layout_height="500dp" 
      android:layout_centerVertical="false" 
      android:textSize="30dp" 
      android:layout_marginTop="30dp" /> 
    </LinearLayout>--> 




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

      <TextView 
       android:id="@+id/result" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:layout_centerVertical="false" 
       android:textSize="30dp" 
       android:layout_marginTop="0dp"/> 

      <TextView 
       android:id="@+id/resultpizze" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:textSize="30sp"/> 

     </LinearLayout> 
     <LinearLayout 
      android:id="@+id/content_main3" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical"> 

      <!--<TextView 
       android:id="@+id/resultpizze" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:layout_centerVertical="false" 
       android:layout_marginTop="30dp" 
       android:textSize="30dp"/>--> 


     </LinearLayout> 
    <LinearLayout 
     android:id="@+id/content_main2" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 
     > 

      <TextView 
       android:id="@+id/result2" 
       android:layout_marginTop="30dp" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:textSize="30sp" 
       /> 

     <!-- <Button 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Manda Email" 
      android:id="@+id/newbutton" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentLeft="true" 
      android:layout_marginTop="300dp" /> 
--> 
     </LinearLayout> 


<!--</ScrollView>--> 
     <Button 
      android:id="@+id/newbutton" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentLeft="true" 
      android:layout_gravity="center_horizontal" 
      android:onClick="sendemail" 
      android:text="Manda Email"> 
     </Button> 

    </LinearLayout> 


    </ScrollView> 



</RelativeLayout> 

Answer 1

Um zu sehen, Ihr Fortschritt, während Ihre PDF erstellt wird, müssen Sie createPDF() in neuen Thread ausführen. ABER Sie möchten eine GUI aktualisieren, wenn Ihre PDF-Datei erstellt wird. Verwenden Sie dazu AsyncTask.

private class MyAsyncTask extends AsyncTask<Void, Void, Void> { 
    @Override 
    protected Void doInBackground(Void... params) { 
     // This runs in new thread!!! 
     // Always run long operations in another thread, so GUI will never be blocked 
     createPDF(); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void v) { 
     // This runs in MAIN thread, after the job's done. 
     // You always have to update gui from main thread 
     pdfProgress.setVisibility(View.GONE); 
    } 
} 

Fügen Sie diese in Ihrem mbutton clicklistener Ihres:

MyAsyncTask myTask = new MyAsyncTask(); 
myTask.execute(); 

Answer 2

Schritt 1 - Deklarieren Sie eine globale Variable - Private ProgressBar pdfProgress;

Schritt 2 - Erstellen Sie ein Fortschrittsbalken-Widget in Ihrer jeweiligen layour.xml (fragment_two) und geben Sie eine ID.

Schritt 3 - In OnCreate() - Methode von TwoFragment, schreibe diesen Code direkt nach der Definition der RootView. pdfProgress = (ProgressBar) rootView.findViewById (R.id. "Ihre Fortschrittsbalken-ID");

Schritt 4 - gerade über createPDF(); schreibe das - pdfProgress.setVisibility (View.VISIBLE);

Schritt 5 - nur unter createPDF(); schreibe das - pdfProgress.setVisibility (View.GONE);

**

aktualisiert Antwort

**

diesen Code in Ihre TwoFragment Versuchen - onClick() -

Button mButton = (Button) rootView.findViewById(R.id.newbutton); 
pdfProgress.setVisibility(View.GONE); 
ProgressBar pdfProgress = (ProgressBar)   
      mButton.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v) { 

        //sendemail(); 
        pdfProgress.setVisibility(View.VISIBLE); 
        createPDF(); 
        pdfProgress.setVisibility(View.GONE); 
        viewPDF(); 



       } 
      }); 

Die fragment_two.xml (Ihr Fragment Layout xml) muss einen Fortschrittsbalken enthalten, der so aussieht - (Sie können auch Zeichnungselemente hinzufügen, vielleicht möchten Sie ein Tutorial dafür ansehen)

<ProgressBar 
style="?android:attr/progressBarStyleLarge" 
android:layout_width="50dp" 
android:layout_height="50dp" 
android:id="@+id/progressBar"/>