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Fragment FragmentBasic.zip null pointer TextView article


Example have error code:

Try to change ArticleFragment.java

 * Copyright (C) 2012 The Android Open Source Project
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      //www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.example.android.fragments;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class ArticleFragment extends Fragment {
    final static String ARG_POSITION = "position";
    int mCurrentPosition = -1;
    TextView articleText;
//    public View onCreateView(LayoutInflater inflater, ViewGroup container,
//        Bundle savedInstanceState) {
//        // If activity recreated (such as from screen rotate), restore
//        // the previous article selection set by onSaveInstanceState().
//        // This is primarily necessary when in the two-pane layout.
//        if (savedInstanceState != null) {
//            mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
//        }
//        // Inflate the layout for this fragment
//        return inflater.inflate(R.layout.article_view, container, false);
//    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // If activity recreated (such as from screen rotate), restore
        // the previous article selection set by onSaveInstanceState().
        // This is primarily necessary when in the two-pane layout.
        if (savedInstanceState != null) {
            mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.article_view, container, false);
        articleText = (TextView) rootView.findViewById(R.id.article);
        return rootView;
    public void onStart() {

        // During startup, check if there are arguments passed to the fragment.
        // onStart is a good place to do this because the layout has already been
        // applied to the fragment at this point so we can safely call the method
        // below that sets the article text.
        Bundle args = getArguments();
        if (args != null) {
            // Set article based on argument passed in
        } else if (mCurrentPosition != -1) {
            // Set article based on saved instance state defined during onCreateView

    public void updateArticleView(int position) {
        //TextView article = (TextView) getActivity().findViewById(R.id.article); //Error: article=null.
        if (articleText != null)
        mCurrentPosition = position;
/* ERROR   public void updateArticleView(int position) {
        TextView article = (TextView) getActivity().findViewById(R.id.article);
        mCurrentPosition = position;

    public void onSaveInstanceState(Bundle outState) {

        // Save the current article selection in case we need to recreate the fragment
        outState.putInt(ARG_POSITION, mCurrentPosition);

397LW NO topic_id


Další témata ....(Topics)


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Ctrl+Click (on Windows) or Cmd+Click (on MacOS) a tab in the editor to navigate to any part of the file path. Select the necessary element in the drop-down, and the corresponding file path opens in an external browser (e.g., in the Explorer, if your OS is Windows).


Find - Rename

Ctrl+F find

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Go to variable declaration: CTRL + B

Ctrl+Shift+I (View | Quick Definition)

Ctrl+Alt+F7  (Edit | Find | Show Usages in the main menu)

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Comment uncomment selected text: CTRL + SHIFT + /

Code completion (Ctrl+Space)

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Ctrl + Delete  delete word from caret to end.

Ctrl + Backspace delete word from caret to start.

Duplicate line: CTRL + D

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Editor Delete Line: CTRL + Y

Move line UP, DOWN. Select a code fragment and press Ctrl+Shift+Up or Ctrl+Shift+Down.

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Quickly move between methods in the editor:  Alt+Up and Alt+Down

Ctrl+Shift+J shortcut joins two lines into one and removes unnecessary space to match your code style

Ctrl+Shift+V to choose and insert recent clipboard contents into the text

Inheritance hierarchy for a selected class: Ctrl+H

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Add unimplemented methods: CTRL + I

Override methods: CTRL + O

Format code: CTRL + ALT + L

Show project: ALT + 1

Show logcat: ALT + 6

Hide project - logcat: SHIFT + ESC

Build: CTRL + F9

Build and Run: CTRL + F10

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Collapse all: CTRL + SHIFT + NumPad +

Expand all: CTRL + SHIFT + NumPad -

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Eclipse: failed to create the java virtual machine - message box

  1. Open folder with Eclipse.exe and find eclipse.ini file

  2. Replace -vmargs
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-vm "c:\Program Files\Java\jdk1.7.0_07\bin\javaw.exe” 

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TableLayout table = (TableLayout)findViewById(R.id.table);
TableRow row = (TableRow)findViewById(R.id.row);

// get table row index android.
int nIndex = table.indexOfChild(row);
table.removeView(row); // invisible and height == 0
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table.addView(row, nIndex); // visible

// add row into certain position
table.addView(row, 3); // visible

// create new TableRow dynamically 
TableRow tr = new TableRow(this);
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        TextView hLabel = new TextView(this);
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        hLabel.setPadding(3, 3, 3, 3);

        TextView hNextLabel = new TextView(this);
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        hNextLabel.setPadding(3, 3, 3, 3);
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        table.addView(row, new TableLayout.LayoutParams());

main.xml ScrollView, TableLayout, TableRow, TextView Android xml layout example

<ScrollView xmlns:android="//schemas.android.com/apk/res/android"
            <TextView android:layout_width="wrap_content"
                      android:text="Row index 0"/>
        <TableRow android:id="@+id/row">
            <TextView android:layout_width="wrap_content"
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            <TextView android:layout_width="wrap_content"
                      android:text="Row index 2"/>
            <TextView android:layout_width="wrap_content"
                      android:text="Row index 3"/>


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-select Java Build Path
-select TAB Order and Export
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-press OK
-clean project by menu Project -> Clean
-rebuild project (Project - Build Automatically)

How add GoogleAdMobAdsSdk....jar to project:
-right click on the project in project tree and select Project properties
-select Java Build Path
-select TAB Libraries
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-clean project
-rebuild project

order-and-export-eclipse dialogue

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- download any mobile styles for example //www.artodia.com/phpbb-styles/mobile/
- unzip style into your forum style folder for example all art_mobile folder copy into 0:/myweb/forum/styles/
- folow instalation istructions //www.artodia.com/phpbb-styles/mobile/tutorials/mobile-detection/
- check url result on https://www.google.com/webmasters/tools/mobile-friendly

Editace: 2016-02-21 12:26:17
Počet článků v kategorii: 397

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