基本上我要完成的是将editText视图存储在数组中并返回随机选择的数组元素的值。 editText视图可以动态添加和删除,因此我不得不考虑到这一点。我已经克服了我的方法,无法找到我的错误。
问题是getAnswer()。目前这正在崩溃应用程序爪哇:
公共类MainActivity扩展AppCompatActivity { private LinearLayout mEditTextContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mEditTextContainer = (LinearLayout)findViewById(R.id.linearLayoutDecisions);
setContentView(activity_main);
//Button to choose random editText contents
final Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer();
}
});
//Button to add editText Field
final Button add_button = (Button) findViewById(R.id.add_button);
add_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Add_Line();
}
});
//Button to remove editText Field
final Button remove_button = (Button) findViewById(R.id.remove_button);
remove_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Remove_Line();
}
});
}
public void Add_Line() {
LinearLayout ll = (LinearLayout)findViewById(R.id.linearLayoutDecisions);
// add edittext
EditText et = new EditText(this);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
et.setLayoutParams(p);
et.setText(null);
et.setHint("Enter Answer #" + (mEditTextContainer.getChildCount()+1));
et.setGravity(Gravity.CENTER);
mEditTextContainer.addView(et);
}
public void Remove_Line() {
int count = mEditTextContainer.getChildCount();
if(count == 2)
return;
else
mEditTextContainer.removeViewAt(mEditTextContainer.getChildCount()-1);
}
public void getAnswer() {
//get number of possible answers
int count = mEditTextContainer.getChildCount();
//create array to hold answers
String[] options = new String[count--];
//create temporary view to store editText view contents
View tempView;
//Loop to collect and store editText contents
for(int i = 1; i < count-1; i++) {
tempView = mEditTextContainer.getChildAt(i);
if(tempView instanceof EditText){
String tempText = ((EditText) tempView).getText().toString();
if(tempText != null){
options[i] = tempText;
}
else
return;
}
}
int number = (int)(Math.random() * count-1);
String answer = options[number];
TextView answerBox = (TextView)findViewById(R.id.textView7);
answerBox.setText(answer);
}
}
答案 0 :(得分:0)
对于任何好奇的人,我找到了答案。在我的方法中,变量'count'不应该减1。改变这个固定了整个事情。