从纵向更改为横向时,我想保存实例。但是,当我尝试对我的字母按钮的背景进行restoreInstance并启用时,它会告诉我该错误。
当我注释掉那些代码时,程序运行良好。
这是字母课
public class Letter extends BaseAdapter {
private String[] letters;
private LayoutInflater letterInf;
public Letter(Context c){
letters = new String[26];
for(int a = 0; a < letters.length; a++){
letters[a] = ""+(char)(a+'A');
}
letterInf = LayoutInflater.from(c);
}
@Override
public int getCount() {
return letters.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Button btnLetter;
if(convertView == null){
btnLetter = (Button) letterInf.inflate(R.layout.letter, null, false);
}else{
btnLetter = (Button) convertView;
}
btnLetter.setText(letters[position]);
return btnLetter;
}
}
这就是我尝试还原onRestoreInstance(整个版本)的方法
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
currPart = savedInstanceState.getInt("currPart");
numChars = savedInstanceState.getInt("numChars");
numCorr = savedInstanceState.getInt("numCorr");
int[] savedBodyPartVisibility = savedInstanceState.getIntArray("bodyPartVisibility");
for(int i = 0; i<savedBodyPartVisibility.length; i++){
bodyParts[i].setVisibility(savedBodyPartVisibility[i]);
}
//saved word
currWord = savedInstanceState.getString("currWord");
hint = savedInstanceState.getString("hint");
if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE){//get orientation
tvHint.setText("Hint:"+hint);// if landscape, show hint
//Toast.makeText(getBaseContext(), "This is landscape!", Toast.LENGTH_SHORT).show();
}
charViews = new TextView[currWord.length()];
wordLayout.removeAllViews();
for(int c = 0; c<currWord.length(); c++){
charViews[c] = new TextView(this);
charViews[c].setText(""+currWord.charAt(c));
charViews[c].setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
charViews[c].setGravity(Gravity.CENTER);
charViews[c].setTextColor(Color.WHITE);
charViews[c].setBackgroundResource(R.drawable.letter_bg);
wordLayout.addView(charViews[c]);
}
//saved charView
int[] savedCharViewColor = savedInstanceState.getIntArray("charViewColor");
for(int i = 0; i< savedCharViewColor.length; i++){
charViews[i].setTextColor(savedCharViewColor[i]);
}
//int numLetters = savedInstanceState.getInt("numLetters");
//letter enable//letter button background color
boolean[] savedLetterEnable = savedInstanceState.getBooleanArray("letterEnable");
int[] savedLettersColor = savedInstanceState.getIntArray("lettersColor");
for(int i = 0; i<savedLetterEnable.length; i++){
letters.getChildAt(i).setEnabled(savedLetterEnable[i]);
//letters.getChildAt(i).setBackgroundColor(savedLettersColor[i]);
}
}
最佳答案
您无法以这种方式还原它,因为视图是在RecyclerView / ListView中回收的。这意味着仅渲染其中一些视图,并且在滚动时会重用已经渲染的视图。
因此,在大多数情况下,数据源中不会有太多子视图作为项目。
正确的方法是将有关项目状态的信息存储在适配器中。
我创建了一个简单的示例,以使您了解它的外观。请注意,setOnSelectedListener(new OnSelectedListener(){...}
是伪造的代码,您应该编写适当的侦听器(onClick,或者如果您要使用复选框,然后使用onCheckedCHange或其他根据您的需要的其他东西)。
public class Letter extends BaseAdapter {
private String[] letters;
private LayoutInflater letterInf;
private Set<String> selectedLetters = new ArraySet();
public Letter(Context c){
letters = new String[26];
for(int a = 0; a < letters.length; a++){
letters[a] = ""+(char)(a+'A');
}
letterInf = LayoutInflater.from(c);
}
Set<String> getState() {
return selectedLetters;
}
void restoreState(Set<String> selectedLetters) {
this.selectedLetters = selectedLetters;
notifyDataSetInvalidated();
}
@Override
public int getCount() {
return letters.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Button btnLetter;
if(convertView == null){
btnLetter = (Button) letterInf.inflate(R.layout.letter, null, false);
}else{
btnLetter = (Button) convertView;
}
if(selectedLetters.contains(letters[position])) {
btnLetter.setSelected(true);
} else {
btnLetter.setSelected(false);
}
btnLetter.setOnSelectedListener(new OnSelectedListener() {
void onSelected(..., boolean isSelected) {
if(isSelected) {
selectedLetters.add(letters[position]);
} else {
selectedLetters.remove(letters[position]);
}
}
});
btnLetter.setText(letters[position]);
return btnLetter;
}
}
然后,每当您保存状态时,都可以从适配器
getState
中获取它,并将其放入savedInstanceState中。无论何时恢复状态,都可以从saveState获取状态并将其放入适配器
restoreState
关于android - 如何解决“AdapterView不支持UnsupportedOperationException:addView(View,LayoutParams)”,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54740419/