将数据从一个活动传递到另一个活动时出现Android错误_Android

将数据从一个活动传递到另一个活动时出现Android错误

android

将数据从一个活动传递到另一个活动时出现Android错误,android,Android,我正在创建一个应用程序，它计算总分和百分比，并在下一个名为ResultActivity的活动中显示结果。我用同样的结果显示一年级学生和二年级学生的成绩，当显示一年级学生的成绩时，一切正常，但当显示二年级学生的成绩时，只显示总分，不显示百分比。我是android开发的新手，请帮我解决这个问题。谢谢：） FIRSTACTIVITY package com.jntuhcalculator.anu.jntuhcalculator; import android.app.Ac

我正在创建一个应用程序，它计算总分和百分比，并在下一个名为ResultActivity的活动中显示结果。我用同样的结果显示一年级学生和二年级学生的成绩，当显示一年级学生的成绩时，一切正常，但当显示二年级学生的成绩时，只显示总分，不显示百分比。我是android开发的新手，请帮我解决这个问题。谢谢：）

FIRSTACTIVITY



    package com.jntuhcalculator.anu.jntuhcalculator;

        import android.app.Activity;
        import android.content.Intent;
        import android.graphics.Typeface;
        import android.os.Bundle;
        import android.util.Log;
        import android.view.View;
        import android.widget.Button;
        import android.widget.EditText;
        import android.widget.TextView;
        import android.widget.Toast;

        /**
         * Created by anu on 18/9/15.
         */
        public class FirstMarks extends Activity {

            TextView tv_Subjects1, tv_Internal1, tv_External1;
            EditText et_Int_Eng, et_Int_M1, et_Int_MM, et_Int_Phy, et_Int_Chem, et_Int_Cp, et_Int_ElcsLab, et_Int_EpLab, et_Int_ItLab, et_Int_Draw;
            EditText et_Ext_Eng, et_Ext_M1, et_Ext_MM, et_Ext_Phy, et_Ext_Chem, et_Ext_Cp, et_Ext_ElcsLab, et_Ext_EpLab, et_Ext_ItLab, et_Ext_Draw;
            Button btn_Cal1, btn_Ok1;
            int IEng,IM1,IMM,IEPhy,IEChem,ICp,IEDraw,IELCS_Lab,IEP_LAB,IIT_LAB;
            int EEng,EM1,EMM,EEPhy,EEChem,ECp,EEDraw,EELCS_Lab,EEP_LAB,EIT_LAB;
            int ITotal1,ETotal1,Total1;
            float Percentage1;
            String f1;

            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.marks_1);


                //INITIALISING VIEWS.
                //INITIALISING TEXT VIEWS.
                tv_Subjects1 = (TextView) findViewById(R.id.tv_Subject1);
                tv_Internal1 = (TextView) findViewById(R.id.tv_Internal1);
                tv_External1 = (TextView) findViewById(R.id.tv_External1);
                //INITIALISING EDIT TEXT.
                //INTERNAL
                et_Int_Eng = (EditText) findViewById(R.id.et_Int_Eng);
                et_Int_M1 = (EditText) findViewById(R.id.et_Int_M1);
                et_Int_MM = (EditText) findViewById(R.id.et_Int_MM);
                et_Int_Phy = (EditText) findViewById(R.id.et_Int_Phy);
                et_Int_Chem = (EditText) findViewById(R.id.et_Int_Chem);
                et_Int_Cp = (EditText) findViewById(R.id.et_Int_Cp);
                et_Int_ElcsLab = (EditText) findViewById(R.id.et_Int_ElcsLab);
                et_Int_EpLab = (EditText) findViewById(R.id.et_Int_EpLab);
                et_Int_ItLab = (EditText) findViewById(R.id.et_Int_ItLab);
                et_Int_Draw = (EditText) findViewById(R.id.et_Int_Draw);
                //EXTERNAL
                et_Ext_Eng = (EditText) findViewById(R.id.et_Ext_Eng);
                et_Ext_M1 = (EditText) findViewById(R.id.et_Ext_M1);
                et_Ext_MM = (EditText) findViewById(R.id.et_Ext_MM);
                et_Ext_Phy = (EditText) findViewById(R.id.et_Ext_Phy);
                et_Ext_Chem = (EditText) findViewById(R.id.et_Ext_Chem);
                et_Ext_Cp = (EditText) findViewById(R.id.et_Ext_Cp);
                et_Ext_ElcsLab = (EditText) findViewById(R.id.et_Ext_ElcsLab);
                et_Ext_EpLab = (EditText) findViewById(R.id.et_Ext_EpLab);
                et_Ext_ItLab = (EditText) findViewById(R.id.et_Ext_ItLab);
                et_Ext_Draw = (EditText) findViewById(R.id.et_Ext_Draw);
                //INITIALISING BUTTON
                btn_Cal1 = (Button) findViewById(R.id.btn_Cal1);
                btn_Ok1 = (Button) findViewById(R.id.btn_Ok1);




                //WHEN SAVE BUTTON IS CLICKED.
                btn_Ok1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                      //GETTING VALUES FROM EDIT TEXT.
                        //INTERNALS.
                        IEng = getIntValue(et_Int_Eng);
                        IM1 = getIntValue(et_Int_M1);
                        IMM = getIntValue(et_Int_MM);
                        IEPhy = getIntValue(et_Int_Phy);
                        IEChem = getIntValue(et_Int_Chem);
                        ICp = getIntValue(et_Int_Cp);
                        IEDraw = getIntValue(et_Int_Draw);
                        IELCS_Lab = getIntValue(et_Int_ElcsLab);
                        IEP_LAB = getIntValue(et_Int_EpLab);
                        //EXTERNALS.
                        EEng = getIntValue(et_Ext_Eng);
                        EM1 = getIntValue(et_Ext_M1);
                        EMM = getIntValue(et_Ext_MM);
                        EEPhy = getIntValue(et_Ext_Phy);
                        EEChem = getIntValue(et_Ext_Chem);
                        ECp = getIntValue(et_Ext_Cp);
                        EEDraw = getIntValue(et_Ext_Draw);
                        EELCS_Lab = getIntValue(et_Ext_ElcsLab);
                        EEP_LAB = getIntValue(et_Ext_EpLab);
                        EIT_LAB = getIntValue(et_Ext_ItLab);

                     //CALCUATIONS.
                        //INTERNAL TOTAL.
                        ITotal1 = (IEng+IM1+IMM+IEPhy+IEChem+ICp+IEDraw+IELCS_Lab+IEP_LAB+IIT_LAB);
                        //EXTERNAL TOTAL.
                        ETotal1 = (EEng+EM1+EMM+EEPhy+EEChem+ECp+EEDraw+EELCS_Lab+EEP_LAB+EIT_LAB);
                        //TOTAL.
                        Total1 = (ITotal1+ETotal1);
                        //PERCENTAGE.
                        Percentage1 = (float)(Total1/10);
                        f1 = Float.toString(Percentage1);

                        //CREATING TOAST.
                        Toast.makeText(getBaseContext(),"Press Result",Toast.LENGTH_SHORT).show();

                    }
                });

                btn_Cal1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent i = new Intent(FirstMarks.this,FirstResult.class);
                        Bundle b = new Bundle();
                        b.putInt("res1",Total1);
                        b.putString("per1",f1);
                        i.putExtras(b);
                        startActivity(i);
                        finish();
                    }
                });




            }



            //SUB-FUNCTION FOR GETTING INTEGER FROM EDITTEXT.
            private int getIntValue(EditText et) throws NumberFormatException {
                int i =0;
                String s;
                try {
                    s = et.getText().toString();
                    if(s.equals("")){
                        Toast.makeText(getApplicationContext(),"Invalid Marks",Toast.LENGTH_SHORT).show();
                    }
                    i = Integer.parseInt(s);
                    return i;

                } catch (NumberFormatException e) {
                    Log.e("ERROR:", "NOT A NUMBER");
                }
                  return 0;

            }


          }

如果您不能在不同的活动之间发送值，我将给您举个例子，试试看

语法是这样的

用于发送数据

String value= getIntent().getStringExtra("keyName");
Intent intent = getIntent();
Bundle extras = intent.getExtras();

用于在活动二接收

 btn_Cal21.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent i = new Intent(SecondMarks_1.this,FirstResult.class);
                        Bundle b = new Bundle();
                        b.putInt("res1",Total21);
                        b.putString("per1",f21);
                        i.putExtras(b);
                        startActivity(i);
                        finish();
                    }
                });

其他提示：-

因此，您需要在FirstActivity中进行编辑

 Intent i = new Intent(FirstMarks.this,FirstResult.class);
                        Bundle b = new Bundle();
                        b.putInt("res1",Total1);
                        b.putString("per1",f1);

以下活动也是如此

还是没有得到？实际上在你的第一个活动中

Intent i = new Intent(SecondMarks_1.this,FirstResult.class);
                    Bundle b = new Bundle();
                    b.putInt("res1",Total21);
                    b.putString("per1",f21);
                    i.putExtras(b);
                    startActivity(i);

在你的第二个活动中

             Bundle b = getIntent().getExtras();
             sres1 = b.getInt("res1", 0);
             sper1 = b.getString("per1");

您看到您在这两个位置都使用了per1字符串，请更改它，这可能会导致应用程序无法获取值（可能会给出其他字符串）
在这一部分中，您需要为要接收的第二个活动结果添加代码

希望这能有所帮助。
啊，是的，但问题是我只有一个显示结果的活动。。！！是的，没关系，只要在接收活动中接收它，如果它对您有帮助，请友好地向上投票回答Hanks很多朋友：）
btn_Cal21.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(SecondMarks_1.this,FirstResult.class); Bundle b = new Bundle(); b.putInt("res1",Total21); b.putString("per1",f21); i.putExtras(b); startActivity(i); finish(); } });

Intent i = new Intent(FirstMarks.this,FirstResult.class); Bundle b = new Bundle(); b.putInt("res1",Total1); b.putString("per1",f1);

Intent i = new Intent(SecondMarks_1.this,FirstResult.class); Bundle b = new Bundle(); b.putInt("res1",Total21); b.putString("per1",f21); i.putExtras(b); startActivity(i);

Bundle b = getIntent().getExtras(); sres1 = b.getInt("res1", 0); sper1 = b.getString("per1");