Request assistance in an android program coding

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Java

I'm having issues in creating a program using Android Studio.But i get a little coding errors. Any assistance would be appreciated.

What I have tried:

These are a few errors i'm having

public void getEditTextGPA() {
       String str = ((EditText) findViewById(R.id.GPAEditText)).getText().toString();
         if (str.trim().equalsIgnoreCase(".")) {
         showAlertMessage("Error", ". is not a valid number");
         this.errorMessageDisplayed = true;
         }
         while (true) {
         if (this.userInputGPA > 4.00D) {
         showAlertMessage("ERROR: CGPA Input", "You cannot have CGPA of over   4.00.");
         this.errorMessageDisplayed = true;
         }
         return;
         if (str.trim().matches("")) {
         this.userInputGPA = -1.0F;
         continue;
         }
         this.userInputGPA = Float.parseFloat(str);
         }

Error at `this.userInputGPA=-1.0F;` as unreachable statement

public void getGPAValueForGrade(String paramString, int paramInt) {
         String[] arrayOfString = {"A", "A-", "B+", "B", "B-", "C+", "C", "C-",   "D+", "D", "E", "Grade"};
         int i = 0;
         if (i >= 12)
         return;
         String str = arrayOfString[i];
         if (paramString.trim().equalsIgnoreCase(str))
         switch (i) {
           default:
           case 0:
           case 1:
           case 2:
           case 3:
           case 4:
           case 5:
           case 6:
           case 7:
           case 8:
           case 9:
           case 10:
           case 11:
         }
         while (true) {
         i++;
         break;
         this.GPAValueArray[paramInt] = 4.0F;
         continue;
         this.GPAValueArray[paramInt] = 3.67F;
         continue;
         this.GPAValueArray[paramInt] = 3.33F;
         continue;
         this.GPAValueArray[paramInt] = 3.0F;
         continue;
         this.GPAValueArray[paramInt] = 2.67F;
         continue;
         this.GPAValueArray[paramInt] = 2.33F;
         continue;
         this.GPAValueArray[paramInt] = 2.0F;
         continue;
         this.GPAValueArray[paramInt] = 1.67F;
         continue;
         this.GPAValueArray[paramInt] = 1.33F;
         continue;
         this.GPAValueArray[paramInt] = 1.0F;
         continue;
         this.GPAValueArray[paramInt] = 0.0F;
         continue;
         }
         }

Error at the 1st `continue;` as unreachable statement

public void getTotalGPAValueFromSpinnerFloat() {
          getGPAValueForGrade(this.gpaSpinnerOne.getSelectedItem().toString(), 0);
          int i = 0 + 1;
          getGPAValueForGrade(this.gpaSpinnerTwo.getSelectedItem().toString(), i);
          int j = i + 1;
          getGPAValueForGrade(this.gpaSpinnerThree.getSelectedItem().toString(), j);
          int k = j + 1;
          getGPAValueForGrade(this.gpaSpinnerFour.getSelectedItem().toString(), k);
          int m = k + 1;
          getGPAValueForGrade(this.gpaSpinnerFive.getSelectedItem().toString(), m);
          int n = m + 1;
          getGPAValueForGrade(this.gpaSpinnerSix.getSelectedItem().toString(), n);
          int i1 = n + 1;
          getGPAValueForGrade(this.gpaSpinnerSeven.getSelectedItem().toString(),i1);
          int i2 = i1 + 1;
          getGPAValueForGrade(this.gpaSpinnerEight.getSelectedItem().toString(), i2);
          (i2 + 1);
          }

Error at the last part (i2 + 1) as not a statement

public void setTextResults() {
        TextView localTextView1 = (TextView) findViewById(R.id.GPATextView);
        TextView localTextView2 = (TextView) findViewById(R.id.CGPATextView);
        float f1 = 0.0F;
        float f2 = 0.0F;
        int i = 0;
        float f3;
        if (i >= 8) {
        f3 = f1 / f2;
        if (f2 != 0.0F)
        break label153;
        localTextView1.setText("GPA: 0.0");
        }
        float f4;
        float f5;
        while (true) {
        if (this.userInputGPA == -1.0F)
        break label258;
        f4 = f1 + this.userInputGPA * this.userInputUnits;
        f5 = f2 + this.userInputUnits;
        if (f5 != 0.0F)
        break label203;
        localTextView2.setText("CGPA: 0.0");
        return;
        if (this.GPAValueArray[i] != -1.0F) {
        f1 += this.GPAValueArray[i] * this.UnitValueArray[i];
        f2 += this.UnitValueArray[i];
        }

Errors at `break label153`,`break label258` & `break label203` as undefinable label

i++;
  break;
  label153:
  StringBuilder localStringBuilder1 = new StringBuilder("GPA: ");
  Object[] arrayOfObject1 = new Object[1];
  arrayOfObject1[0] = Float.valueOf(f3);
  localTextView1.setText(String.format("%.2f", arrayOfObject1));

Error in `StringBuilder localStringBuilder1 = new StringBuilder("GPA: ")` as not a statement

label203:
    Float f6 = f4 / f5;
    StringBuilder localStringBuilder3 = new StringBuilder("CGPA: ");
    Object[] arrayOfObject3 = new Object[1];
    arrayOfObject3[0] = Float.valueOf(f6);
    localTextView2.setText(String.format("%.2f", arrayOfObject3));
    return;

Error in `Float f6 = f4 / f5` as not a statement