我正在尝试让ViewPager工作，但我的代码的一部分导致了问题。有问题的代码部分直接发布在下面。从我怀疑，我的TextViews被重复更新，因为位置被迭代到方法getCount（）中设置的值，这是我的数组的大小。
无论如何，下面所有这些都是我的代码，因为我到目前为止。
来自ViewPagerAdapter.java的有问题的代码
// Capture position and set to the TextViews
tvNumber.setText(arrayAtomicNum.get(position));
tvSymbol.setText(arraySymbol.get(position));
tvName.setText(arrayName.get(position));
tvGroup.setText(arrayGroup.get(position));
tvPeriod.setText(arrayPeriod.get(position));
tvBlock.setText(arrayBlock.get(position));
tvFamily.setText(arrayFamily.get(position));
tvColor.setText(arrayColor.get(position));
tvPhase.setText(arrayPhase.get(position));
tvNeutrons.setText(arrayNeutrons.get(position));
tvProtons.setText(arrayProtons.get(position));
tvElectrons.setText(arrayElectrons.get(position));
这是全班ViewPagerAdapter.java
public class ViewPagerAdapter extends PagerAdapter {
public static String TAG = ViewPagerAdapter.class.getSimpleName();
Context context;
LayoutInflater inflater;
List<Integer> arrayAtomicNum = new ArrayList<Integer>();
List<String> arrayName = new ArrayList<String>();
List<String> arraySymbol = new ArrayList<String>();
List<String> arrayFamily = new ArrayList<String>();
List<String> arrayPhase = new ArrayList<String>();
List<String> arrayColor = new ArrayList<String>();
List<Integer> arrayGroup = new ArrayList<Integer>();
List<Integer> arrayPeriod = new ArrayList<Integer>();
List<String> arrayBlock = new ArrayList<String>();
List<Integer> arrayProtons = new ArrayList<Integer>();
List<Integer> arrayNeutrons = new ArrayList<Integer>();
List<Integer> arrayElectrons = new ArrayList<Integer>();
public ViewPagerAdapter(Context context, List<Integer> arrayAtomicNum,
List<String> arrayName, List<String> arraySymbol, List<String> arrayFamily,
List<String> arrayPhase, List<String> arrayColor, List<Integer> arrayGroup,
List<Integer> arrayPeriod, List<String> arrayBlock, List<Integer> arrayProtons,
List<Integer> arrayNeutrons, List<Integer> arrayElectrons) {
this.context = context;
this.arrayAtomicNum = arrayAtomicNum;
this.arrayName = arrayName;
this.arraySymbol = arraySymbol;
this.arrayFamily = arrayFamily;
this.arrayPhase = arrayPhase;
this.arrayColor = arrayColor;
this.arrayGroup = arrayGroup;
this.arrayPeriod = arrayPeriod;
this.arrayBlock = arrayBlock;
this.arrayProtons = arrayProtons;
this.arrayNeutrons = arrayNeutrons;
this.arrayElectrons = arrayElectrons;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
//return 0;
return arrayAtomicNum.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
// TODO Auto-generated method stub
//return false;
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// Declare Variables
TextView tvNumber; // container for atomic number
TextView tvSymbol; // container for symbol
TextView tvName; // container for name
TextView tvGroup; // container for group
TextView tvPeriod; // container for period
TextView tvBlock; // container for block
TextView tvFamily; // container for family
TextView tvColor; // container for color
TextView tvPhase; // container for phase
TextView tvNeutrons; // container for neutrons
TextView tvProtons; // container for protons
TextView tvElectrons; // container for electrons
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.frame_learn, container,
false);
// Locate the TextViews in viewpager_item.xml
// atomic number textView
tvNumber = (TextView)itemView.findViewById(R.id.metanumber);
// symbol textView
tvSymbol = (TextView)itemView.findViewById(R.id.metasymbol);
// name textView
tvName = (TextView)itemView.findViewById(R.id.metaname);
// group textView
tvGroup = (TextView)itemView.findViewById(R.id.metagroup);
// period textView
tvPeriod = (TextView)itemView.findViewById(R.id.metaperiod);
// block textView
tvBlock = (TextView)itemView.findViewById(R.id.metablock);
// family textView
tvFamily = (TextView)itemView.findViewById(R.id.metafamily);
// color textView
tvColor = (TextView)itemView.findViewById(R.id.metacolor);
// phase textView
tvPhase = (TextView)itemView.findViewById(R.id.metaphase);
// neutrons textView
tvNeutrons = (TextView)itemView.findViewById(R.id.metaneutrons);
// protons textView
tvProtons = (TextView)itemView.findViewById(R.id.metaprotons);
// electrons textView
tvElectrons = (TextView)itemView.findViewById(R.id.metaelectrons);
//comment out the setText and logs will print out full arrayLists
Log.d(TAG, "arrayAtomicNum.get(position): " + arrayAtomicNum.get(position));
Log.d(TAG, "arraySymbol.get(position): " + arraySymbol.get(position));
Log.d(TAG, "arrayName.get(position): " + arrayName.get(position));
// Capture position and set to the TextViews
tvNumber.setText(arrayAtomicNum.get(position));
tvSymbol.setText(arraySymbol.get(position));
tvName.setText(arrayName.get(position));
tvGroup.setText(arrayGroup.get(position));
tvPeriod.setText(arrayPeriod.get(position));
tvBlock.setText(arrayBlock.get(position));
tvFamily.setText(arrayFamily.get(position));
tvColor.setText(arrayColor.get(position));
tvPhase.setText(arrayPhase.get(position));
tvNeutrons.setText(arrayNeutrons.get(position));
tvProtons.setText(arrayProtons.get(position));
tvElectrons.setText(arrayElectrons.get(position));
// Add viewpager_item.xml to ViewPager
((ViewPager) container).addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
}
我在另一个名为LearnActivity.java的Activity中填充我的arrayLists
public class LearnActivity extends Activity {
public static String TAG = LearnActivity.class.getSimpleName();
ViewPager viewPager;
PagerAdapter adapter;
private int atomicNum = 0;
private int temp1;
private int temp2;
List<Integer> arrayAtomicNum = new ArrayList<Integer>();
List<String> arrayName = new ArrayList<String>();
List<String> arraySymbol = new ArrayList<String>();
List<String> arrayFamily = new ArrayList<String>();
List<String> arrayPhase = new ArrayList<String>();
List<String> arrayColor = new ArrayList<String>();
List<Integer> arrayGroup = new ArrayList<Integer>();
List<Integer> arrayPeriod = new ArrayList<Integer>();
List<String> arrayBlock = new ArrayList<String>();
List<Integer> arrayProtons = new ArrayList<Integer>();
List<Integer> arrayNeutrons = new ArrayList<Integer>();
List<Integer> arrayElectrons = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_learn);
Log.d(TAG, "Learn layout loaded successfully");
while (atomicNum < 3) {
atomicNum++;
if (atomicNum == 1) {
ElementStructure.setName("Hydrogen");
ElementStructure.setSymbol("H");
ElementStructure.setFamily("Non metals");
ElementStructure.setPhase("Gas");
ElementStructure.setColor("Colorless");
ElementStructure.setAtomicNum(atomicNum);
ElementStructure.setGroup(1);
ElementStructure.setPeriod(1);
ElementStructure.setBlock("s");
ElementStructure.setProton(atomicNum);
} else if (atomicNum == 2) {
ElementStructure.setName("Helium");
ElementStructure.setSymbol("He");
ElementStructure.setFamily("Noble gases");
ElementStructure.setPhase("Gas");
ElementStructure.setColor("Colorless");
ElementStructure.setAtomicNum(atomicNum);
ElementStructure.setGroup(18);
ElementStructure.setPeriod(1);
ElementStructure.setBlock("s");
ElementStructure.setProton(atomicNum);
} else if (atomicNum == 3) {
ElementStructure.setName("Lithium");
ElementStructure.setSymbol("Li");
ElementStructure.setFamily("Alkali metals");
ElementStructure.setPhase("Solid");
ElementStructure.setColor("Silvery white");
ElementStructure.setAtomicNum(atomicNum);
ElementStructure.setGroup(1);
ElementStructure.setPeriod(2);
ElementStructure.setBlock("s");
}
// Atoms must have equal number(s) of protons and electrons
ElementStructure.setElectron(ElementStructure.getProton());
/* Legend:
* temp1-atomic weight rounded to nearest whole integer
* temp2-number of neutrons */
//temp1 = (int)Math.round(ElementStructure.getWeight());
temp1 = 100; //just a test value
temp2 = temp1 - ElementStructure.getProton();
ElementStructure.setNeutron(temp2);
// Populate arrays
arrayAtomicNum.add(ElementStructure.getAtomicNum());
arrayName.add(ElementStructure.getName());
arraySymbol.add(ElementStructure.getSymbol());
arrayFamily.add(ElementStructure.getFamily());
arrayPhase.add(ElementStructure.getPhase());
arrayColor.add(ElementStructure.getColor());
arrayGroup.add(ElementStructure.getGroup());
arrayPeriod.add(ElementStructure.getPeriod());
arrayBlock.add(ElementStructure.getBlock());
arrayProtons.add(ElementStructure.getProton());
arrayNeutrons.add(ElementStructure.getNeutron());
arrayElectrons.add(ElementStructure.getElectron());
} //end while loop
viewPager = (ViewPager)findViewById(R.id.pager);
viewPager.setOffscreenPageLimit(3);
adapter = new ViewPagerAdapter(LearnActivity.this, arrayAtomicNum, arrayName,
arraySymbol, arrayFamily, arrayPhase, arrayColor, arrayGroup, arrayPeriod,
arrayBlock, arrayProtons, arrayNeutrons, arrayElectrons);
viewPager.setAdapter(adapter);
}
}
所有数组列表都有正确的值，似乎我已经将我想要的所有数据正确关联起来。还有更多，但我试图保持这个帖子有限。在任一情况下， 您认为导致以下错误的是什么？我知道在尝试setText时会发生这种情况，但为什么呢？
答案 0 :(得分：2)
如果要将整数作为文本设置为TextView，则应使用
textView.setText(String.valueOf(intValue));
如果只设置int值，TextView将尝试使用该int值访问资源。