如何在不按下按钮的情况下开始活动?

Question

我有一个活动，问用户一个问题。目前，它会永远提问，直到用户退出应用程序，但我希望它提出 20 个问题，然后继续新活动。我想如果我这样做：

for(int i = 0;i < 20;i++){
random = new Random();
chooseQuestion();
}
Intent i =  new Intent(PlayGame.this, Gamble.class);
startActivity(i);

它可以工作，但我的应用程序现在坏了。我是否错误地打开了新活动，如果是，我应该如何继续？

好的，我对此真的很陌生，我不知道要发布多少代码来回复评论，所以这就是全部，对不起。

public class PlayGame extends Activity implements OnClickListener {
//set up minimum and maximum numbers for different operators and difficulty levels
private int level = 0, answer = 0, operator = 0, operand1 = 0, operand2 = 0;
private final int ADD_OPERATOR = 0, SUBTRACT_OPERATOR = 1, MULTIPLY_OPERATOR = 2, DIVIDE_OPERATOR = 3;
private String[] operators = {"+", "-", "x", "/"};
private int[][] levelMin = {
{1, 11, 21},
{1, 5, 10},
{2, 5, 10},
{2, 3, 5}};
private int[][] levelMax = {
{10, 25, 50},
{10, 20, 30},
{5, 10, 15},
{10, 50, 100}};
private Random random;
private TextView question, answerTxt, scoreTxt, coincountTxt;
private ImageView response;
private Button btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0, enterBtn, clearBtn;
@Override
//tell the buttons to be buttons when the activity is opened
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_playgame);
question =  (TextView)findViewById(R.id.question);
answerTxt = (TextView)findViewById(R.id.answer);
response =  (ImageView)findViewById(R.id.response);
scoreTxt =  (TextView)findViewById(R.id.score);
coincountTxt = (TextView)findViewById(R.id.coincount);
response.setVisibility(View.INVISIBLE);
btn1 = (Button)findViewById(R.id.btn1);
btn2 = (Button)findViewById(R.id.btn2);
btn3 = (Button)findViewById(R.id.btn3);
btn4 = (Button)findViewById(R.id.btn4);
btn5 = (Button)findViewById(R.id.btn5);
btn6 = (Button)findViewById(R.id.btn6);
btn7 = (Button)findViewById(R.id.btn7);
btn8 = (Button)findViewById(R.id.btn8);
btn9 = (Button)findViewById(R.id.btn9);
btn0 = (Button)findViewById(R.id.btn0);
enterBtn = (Button)findViewById(R.id.enter);
clearBtn = (Button)findViewById(R.id.clear);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
btn5.setOnClickListener(this);
btn6.setOnClickListener(this);
btn7.setOnClickListener(this);
btn8.setOnClickListener(this);
btn9.setOnClickListener(this);
btn0.setOnClickListener(this);
enterBtn.setOnClickListener(this);
clearBtn.setOnClickListener(this);
Bundle extras = getIntent().getExtras();
if(extras != null)
{
int passedLevel = extras.getInt("level", -1);
if(passedLevel>=0) level = passedLevel;

}
for(int i = 0;i < 20;i++){
random = new Random();
chooseQuestion();
}
Intent i =  new Intent(PlayGame.this, Gamble.class);
startActivity(i);
}
//find which button pressed on main menu and set operator accordingly
public int getOperator() {
Bundle extras = getIntent().getExtras();
int type = extras.getInt("type", -1);
if(type==1) operator = ADD_OPERATOR;
else if(type==2) operator = SUBTRACT_OPERATOR;
else if(type==3) operator = MULTIPLY_OPERATOR;
else if(type==4) operator = DIVIDE_OPERATOR;
//randomly finds operator for each successive question
else if(type==5) operator = random.nextInt(operators.length);
return operator;
}
//get random valid question within the parameters defined by operation and difficulty
private void chooseQuestion(){
//get a question
answerTxt.setText("= ?");
operator = getOperator();
operand1 = getOperand();
operand2 = getOperand();
//get new subtraction question if answer is negative
if(operator == SUBTRACT_OPERATOR){
while(operand2>operand1){
operand1 = getOperand();
operand2 = getOperand();
}
}
//get new division question if answer is not whole number
else if(operator==DIVIDE_OPERATOR){
while((((double)operand1/(double)operand2)%1 > 0) || (operand1==operand2))
{
operand1 = getOperand();
operand2 = getOperand();
}
}
//find answer to question
switch(operator)
{
case ADD_OPERATOR:
answer = operand1+operand2;
break;
case SUBTRACT_OPERATOR:
answer = operand1-operand2;
break;
case MULTIPLY_OPERATOR:
answer = operand1*operand2;
break;
case DIVIDE_OPERATOR:
answer = operand1/operand2;
break;
default:
break;
}
//set text to show question on screen
question.setText(operand1+" "+operators[operator]+" "+operand2);
}
//random number generator
private int getOperand(){
//return operand number
return random.nextInt(levelMax[operator][level] - levelMin[operator][level] + 1)
+ levelMin[operator][level];
}
//tell buttons what to do when clicked on
@Override
public void onClick(View view) {
//button clicked
if(view.getId()==R.id.enter){
//enter button
String answerContent = answerTxt.getText().toString();
if(!answerContent.endsWith("?"))
{
//answer has been entered, check if correct
int enteredAnswer = Integer.parseInt(answerContent.substring(2));
int exScore = getScore();
int exCoincount = getCoincount();
if(enteredAnswer==answer){
//correct - show tick and add one to score and coincount
scoreTxt.setText("Score: "+(exScore+1));
response.setImageResource(R.drawable.tick);
response.setVisibility(View.VISIBLE);
coincountTxt.setText(""+(exCoincount+1));
}
else{
//incorrect - show cross and reset score to 0
scoreTxt.setText("Score: 0");
response.setImageResource(R.drawable.cross);
response.setVisibility(View.VISIBLE);
}
//show new question
chooseQuestion();
}
}
//if clear button clicked reset answer text to question mark
else if(view.getId()==R.id.clear){
//clear button
answerTxt.setText("= ?");
}
else if(view.getId()==R.id.help_btn){
//help button
Intent i =  new Intent(PlayGame.this, HowToPlay.class);
startActivity(i);
}
//if number clicked:
else {
//number button
response.setVisibility(View.INVISIBLE);
int enteredNum = Integer.parseInt(view.getTag().toString());
//if first number replace question mark
if(answerTxt.getText().toString().endsWith("?"))
answerTxt.setText("= "+enteredNum);
//if subsequent number append to previous
else
answerTxt.append(""+enteredNum);
}
}
//function to calculate score (used above in 'correct' if statement
private int getScore(){
String scoreStr = scoreTxt.getText().toString();
return Integer.parseInt(scoreStr.substring(scoreStr.lastIndexOf(" ")+1));
}
//function to calculate number of coins
private int getCoincount(){
String coincountStr = coincountTxt.getText().toString();
return Integer.parseInt(coincountStr.substring(coincountStr.lastIndexOf(" ")+1));
}
}

我引用的代码是onCreate((，它从不远处调用函数chooseQuestion((。

Answer 1

使用处理程序

new Handler().postDelayed(new Runnable(){
public void run(){
//start activity here
}
}, 1000); 

Answer 2

试试这个：

for(int i = 0;i <= 20;i++){
if(i==20){
Intent i =  new Intent(PlayGame.this, Gamble.class);
startActivity(i);
break;
} else {
random = new Random();
chooseQuestion();
}
}

Answer 3

使用线程

new Thread(new Runnable() {
@Override
public void run() {
//enter code here
}).start();}