[英]How to pass int value on button click from one activity to another?
[英]How to pass int value from one class to another?
我不敢相信我有這么多麻煩。 我的游戲活動中包含以下變量:
public static int numberOfPointsA;
在另一項活動中
public static int numberOfPointsB;
現在,我需要將這些值傳遞給另一個活動,在這里我應該合計這些值並將結果設置為textView。 由於這些是公共靜態變量,因此我嘗試:
public static int totalScore = ClassA.numberOfPointsA + ClassB.numberOfPointsB;
textView.setText("" + totalScore);
但這不起作用。 所以我嘗試了一下:
在游戲類A中:
Intent intent = new Intent(this, Menu.class);
intent.putExtra("foobar", numberOfPointsA);
startActivity(intent);
並在菜單類中:
Intent intent = getIntent();
int numberOfPointsA = intent.getIntExtra("foobar", 0);
但這也不起作用。 如果我將活動置於活動范圍內,則活動一旦開始就會崩潰。 如果將其放在onCreate方法中,則可以再使用int變量,而在onCreate方法中不需要它,在其他地方也需要它。
那么如何在游戲類中設置我的變量,傳遞給菜單類,將其保存在那里,然后使其等待,直到我完成我的游戲類B並對該變量進行相同的操作,然后將這兩個變量求和並將其成功設置為textView?
菜單活動:
公共類Izbor擴展Activity實現OnClickListener {
private int asocijacijeUkupno = 0;
private int thUkupno = 0;
int ukupanBrojPoena = asocijacijeUkupno + thUkupno;
Button toploHladno, asocijacije, cigle, spojnice, nazad, poeniTH, poeniAso, poeniCigle, poeniSpojnice, poeniUkupno;
TextView naslov;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
asocijacijeUkupno = getIntent().getIntExtra("RUNNING_TOTAL", 0);
thUkupno = getIntent().getIntExtra("RUNNING_TOTAL2", 0);
setContentView(R.layout.izbor);
addListenerOnButton();
}
private void addListenerOnButton() {
naslov = (TextView) findViewById(R.id.tvIzborNaslov);
toploHladno = (Button) findViewById(R.id.bIzbor1);
asocijacije = (Button) findViewById(R.id.bIzbor2);
cigle = (Button) findViewById(R.id.bIzbor3);
spojnice = (Button) findViewById(R.id.bIzbor4);
nazad = (Button) findViewById(R.id.bIzborNazad);
poeniTH = (Button) findViewById(R.id.bPoeniTH);
poeniAso = (Button) findViewById(R.id.bPoeniAso);
poeniCigle = (Button) findViewById(R.id.bPoeniCigle);
poeniSpojnice = (Button) findViewById(R.id.bPoeniSpojnice);
poeniUkupno = (Button) findViewById(R.id.bPoeniUkupno);
toploHladno.setOnClickListener(this);
asocijacije.setOnClickListener(this);
cigle.setOnClickListener(this);
spojnice.setOnClickListener(this);
nazad.setOnClickListener(this);
}
@Override
protected void onStart() {
super.onStart();
if(asocijacijeUkupno != 0){
poeniAso.setText("" + asocijacijeUkupno);
}else{
poeniAso.setText("");
}
if(thUkupno != 0){
poeniTH.setText("" + thUkupno);
}else{
poeniTH.setText("");
}
if(ukupanBrojPoena != 0){
poeniUkupno.setText("" + ukupanBrojPoena);
}else{
poeniUkupno.setText("");
}
}
public void onClick(View v) {
switch(v.getId()){
case R.id.bIzbor1:
if(music == true){
buttonClicks.start();
}
startActivity(new Intent("rs.androidaplikacije.toplo_hladno.TOPLOHLADNO"));
break;
case R.id.bIzbor2:
if(music == true){
buttonClicks.start();
}
startActivity(new Intent("rs.androidaplikacije.toplo_hladno.ASOCIJACIJE"));
break;
case R.id.bIzbor3:
if(music == true){
buttonClicks.start();
}
break;
case R.id.bIzbor4:
if(music == true){
buttonClicks.start();
}
break;
case R.id.bIzborNazad:
if(music == true){
buttonBack.start();
}
finish();
break;
}
}
}
以下是一個非常基本的示例,使用兩個活動來傳遞一個int
。
首次活動,您從以下位置開始:
public class FirstActivity extends Activity {
private int mTotal = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//.... onCreate code, layout stuff etc....
}
// this is tied to a View onClick call
public void moveToSecondAct(View view) {
Intent intent = new Intent();
intent.putExtra("RUNNING_TOTAL",mTotal);
intent.setClass(this, SecondActivity.class);
//... any other options like ...
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// start the second Activity
startActivity(intent);
}
}
第二個Activity示例類似於:
public class SecondActivity extends Activity {
private int mTotal = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTotal = getIntent().getIntExtra("RUNNING_TOTAL", 0);
//.... onCreate code, layout stuff etc....
Log.i("Running total is:"+ mTotal);
// update the total on the TextView
TextView tv = (TextView) findViewById(R.id.poeniUkupno);
tv.setText("Total: "+ mTotal);
}
}
編輯:嘗試進行一些更改有助於使事情更清晰
我沒有完全理解您要說的內容,但是我想要在FirstActivity中創建一個變量,將其值發送給SecondActivity,然后將它們的總和傳遞給ResultActivity(如果有的話),然后就可以了
//First Activity
public class FirstActivity extends Activity{
int firstValue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
firstValue = 10;
}
public sendValueToSecondActivity(View view){
Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("firstValue", firstValue);
startActivity(intent);
}
}
//Second Activity
public class SecondActivity extends Activity{
int sumOfFirstAndSecond;
int secondValue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
secondValue = 20;
}
public sendValueToSecondActivity(View view){
sumOfFirstAndSecond = getIntent().getIntExtra("firstValue") + secondValue;
Intent intent = new Intent(this, ResultActivity.class);
intent.putExtra("sumOfFirstAndSecond", sumOfFirstAndSecond);
startActivity(intent);
}
}
//Result Activity
public class ResultActivity extends Activity{
TextView textView;
int result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
secondValue = 20;
textView = (TextView) findViewById(R.id.textView);
}
public setResultToTextView(View view){
result = getIntent().getIntExtra("sumOfFirstAndSecond");
textView.setText(""+result);
}
}
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