我写了一个代码，用于根据成绩计算GPA。但是问题是每次我单击按钮时，它都会更新数组中的值，并且结果会不断变化。在阅读了很多文章之后，我真的不知道该如何克服这个问题。还有其他方法可以实现而不会出现此问题。请让我知道你们。希望我能尽快得到答案。预先感谢大家。
public class CSE4SEM extends AppCompatActivity {
static Float gpa = 0.0F;
final int FinalPoints[] = new int[9];
final int rcvdPoints[] = new int[9];
TextView tvres;
Spinner sp1, sp2, sp3, sp4, sp5, sp6, sp7, sp8, sp9;
Button btn;
int sumRes = 0, sumPoints = 0;
int maxPoints[] = new int[]{4, 4, 4, 3, 3, 3, 2, 2, 2};
int arrear = 0;
public void calc(View v) {
for (int j = 0; j < maxPoints.length; j++) {
FinalPoints[j] = rcvdPoints[j] * maxPoints[j];
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cse4_sem);
tvres = findViewById(R.id.tvRes);
btn = findViewById(R.id.btn);
sp1 = findViewById(R.id.sp1);
sp2 = findViewById(R.id.sp2);
sp3 = findViewById(R.id.sp3);
sp4 = findViewById(R.id.sp4);
sp5 = findViewById(R.id.sp5);
sp6 = findViewById(R.id.sp6);
sp7 = findViewById(R.id.sp7);
sp8 = findViewById(R.id.sp8);
sp9 = findViewById(R.id.sp9);
sp1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp1.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 10;
}
if (sp1.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 9;
}
if (sp1.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 8;
}
if (sp1.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 7;
}
if (sp1.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 6;
}
if (sp1.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 5;
}
if (sp1.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[0] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp2.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 10;
}
if (sp2.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 9;
}
if (sp2.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 8;
}
if (sp2.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 7;
}
if (sp2.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 6;
}
if (sp2.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 5;
}
if (sp2.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[1] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp3.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp3.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 10;
}
if (sp3.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 9;
}
if (sp3.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 8;
}
if (sp3.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 7;
}
if (sp3.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 6;
}
if (sp3.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 5;
}
if (sp3.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[2] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp4.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp4.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 10;
}
if (sp4.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 9;
}
if (sp4.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 8;
}
if (sp4.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 7;
}
if (sp4.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 6;
}
if (sp4.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[3] = 5;
}
if (sp4.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp5.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp5.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 10;
}
if (sp5.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 9;
}
if (sp5.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 8;
}
if (sp5.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 7;
}
if (sp5.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 6;
}
if (sp5.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 5;
}
if (sp5.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[4] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp6.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp6.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 10;
}
if (sp6.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 9;
}
if (sp6.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 8;
}
if (sp6.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 7;
}
if (sp6.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 6;
}
if (sp6.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 5;
}
if (sp6.getSelectedItemPosition() == 6) {
// Toast.makeText(getAp q plicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[5] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp7.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp7.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 10;
}
if (sp7.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 9;
}
if (sp7.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 8;
}
if (sp7.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 7;
}
if (sp7.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 6;
}
if (sp7.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 5;
}
if (sp7.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[6] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp8.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp8.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 10;
}
if (sp8.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 9;
}
if (sp8.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 8;
}
if (sp8.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 7;
}
if (sp8.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 6;
}
if (sp8.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 5;
}
if (sp8.getSelectedItemPosition() == 6) {
// Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[7] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
sp9.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if (sp9.getSelectedItemPosition() == 0) {
//Toast.makeText(getApplicationContext(),"0 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 10;
}
if (sp9.getSelectedItemPosition() == 1) {
//Toast.makeText(getApplicationContext(),"1 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 9;
}
if (sp9.getSelectedItemPosition() == 2) {
//Toast.makeText(getApplicationContext(),"2 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 8;
}
if (sp9.getSelectedItemPosition() == 3) {
//Toast.makeText(getApplicationContext(),"3 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 7;
}
if (sp9.getSelectedItemPosition() == 4) {
// Toast.makeText(getApplicationContext(),"4 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 6;
}
if (sp9.getSelectedItemPosition() == 5) {
//Toast.makeText(getBaseContext(),"5 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 5;
}
if (sp9.getSelectedItemPosition() == 6) {
//Toast.makeText(getApplicationContext(),"6 String Selected",Toast.LENGTH_LONG).show();
rcvdPoints[8] = 0;
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
/* for(int i=0;i<maxPoints.length;i++) {
FinalPoints[i]=rcvdPoints[i]*maxPoints[i];
}*/
calc(view);
for (int num : FinalPoints) {
sumPoints = num + sumPoints;
}
for (int num : maxPoints) {
sumRes = num + sumRes;
}
float sumPointsFloat = sumPoints, sumResFloat = sumRes;
gpa = sumPointsFloat / sumResFloat;
tvres.setText(Float.toString(gpa));
}
});
}
}