我正在创建一个计算总分数的应用程序。百分比并在名为ResultActvity的下一个活动中显示结果。我正在使用相同的ResultActivity来显示第1年级学生的结果。第二年的学生成绩，一切正常，当它显示第一年的学生的结果，但是当它显示第二年的学生的结果时，它只显示总分，但没有显示％。我是android开发的新手，请帮我解决这个问题。谢谢你:)。
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;
}
}
**SECONDACTIVITY**
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 19/9/15.
*/
public class SecondMarks_1 extends Activity {
TextView tv_PS,tv_MFCS,tv_DS,tv_DLD,tv_EDC,tv_BEE,tv_EELab,tv_DSLab;
TextView tv_Subjects21, tv_Internal21, tv_External21;
EditText et_Int_PS, et_Int_MFCS, et_Int_DS, et_Int_DLD, et_Int_EDC, et_Int_BEE, et_Int_EELab, et_Int_DSLab;
EditText et_Ext_PS, et_Ext_MFCS, et_Ext_DS, et_Ext_DLD, et_Ext_EDC, et_Ext_BEE, et_Ext_EELab, et_Ext_DSLab;
Button btn_Cal21, btn_Ok21;
int IPS,IMFCS,IDS,IDLD,IEDC,IBEE,IEE_Lab,IDS_Lab;
int EPS,EMFCS,EDS,EDLD,EEDC,EBEE,EEE_Lab,EDS_Lab;
int ITotal21,ETotal21,Total21;
float Percentage21;
String f21;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondmarks_1);
//INITIALISING VIEWS.
//INITIALISING TEXT VIEWS.
tv_Subjects21 = (TextView) findViewById(R.id.tv_Subject21);
tv_Internal21 = (TextView) findViewById(R.id.tv_Internal21);
tv_External21 = (TextView) findViewById(R.id.tv_External21);
//SUBJECT TEXT VIEWS.
tv_PS = (TextView) findViewById((R.id.tv_PS));
tv_MFCS = (TextView) findViewById((R.id.tv_MFCS));
tv_DS = (TextView) findViewById((R.id.tv_DS));
tv_DLD = (TextView) findViewById((R.id.tv_DLD));
tv_EDC = (TextView) findViewById((R.id.tv_EDC));
tv_BEE = (TextView) findViewById((R.id.tv_BEE));
tv_EELab = (TextView) findViewById((R.id.tv_EE_Lab));
tv_DSLab = (TextView) findViewById((R.id.tv_DS_Lab));
//INITIALISING EDIT TEXT.
//INTERNAL
et_Int_PS = (EditText) findViewById(R.id.et_Int_PS);
et_Int_MFCS = (EditText) findViewById(R.id.et_Int_MFCS);
et_Int_DS = (EditText) findViewById(R.id.et_Int_DS);
et_Int_DLD = (EditText) findViewById(R.id.et_Int_DLD);
et_Int_EDC = (EditText) findViewById(R.id.et_Int_EDC);
et_Int_BEE = (EditText) findViewById(R.id.et_Int_BEE);
et_Int_EELab = (EditText) findViewById(R.id.et_Int_EELab);
et_Int_DSLab = (EditText) findViewById(R.id.et_Int_DSLab);
//EXTERNAL
et_Ext_PS = (EditText) findViewById(R.id.et_Ext_PS);
et_Ext_MFCS = (EditText) findViewById(R.id.et_Ext_MFCS);
et_Ext_DS = (EditText) findViewById(R.id.et_Ext_DS);
et_Ext_DLD = (EditText) findViewById(R.id.et_Ext_DLD);
et_Ext_EDC = (EditText) findViewById(R.id.et_Ext_EDC);
et_Ext_BEE = (EditText) findViewById(R.id.et_Ext_BEE);
et_Ext_EELab = (EditText) findViewById(R.id.et_Ext_EELab);
et_Ext_DSLab = (EditText) findViewById(R.id.et_Ext_DSLab);
//INITIALISING BUTTON
btn_Cal21 = (Button) findViewById(R.id.btn_Cal21);
btn_Ok21 = (Button) findViewById(R.id.btn_Ok21);
//DISPLAYING SUBJECT NAMES WHEN TEXT VIEW IS CLICKED.
tv_PS.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
disp(tv_PS, "PS:Probabilty & Statistics");
}
});
tv_MFCS.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
disp(tv_MFCS, "MFCS:Mathematical Foundation Of Computer Science");
}
});
tv_DS.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {disp(tv_DS, "DS:Data Structures");
}
});
tv_DLD.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
disp(tv_DLD, "DLD:Digital Logic Design");
}
});
tv_EDC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
disp(tv_EDC, "EDC:Electronic Devices & Circuits");
}
});
tv_BEE.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { disp(tv_BEE, "BEE:Basic Electrical Engineering");
}
});
tv_EELab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { disp(tv_EELab, "Electrical & Electronics Lab");
}
});
tv_DSLab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {disp(tv_DSLab, "Data Structures Lab");
}
});
//WHEN SAVE BUTTON IS CLICKED.
btn_Ok21.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//GETTING VALUES FROM EDIT TEXT.
//INTERNALS.
IPS = getIntValue(et_Int_PS);
IMFCS = getIntValue(et_Int_MFCS);
IDS = getIntValue(et_Int_DS);
IDLD = getIntValue(et_Int_DLD);
IEDC = getIntValue(et_Int_EDC);
IBEE = getIntValue(et_Int_BEE);
IEE_Lab = getIntValue(et_Int_EELab);
IDS_Lab = getIntValue(et_Int_DSLab);
//EXTERNALS.
EPS = getIntValue(et_Ext_PS);
EMFCS = getIntValue(et_Ext_MFCS);
EDS = getIntValue(et_Ext_DS);
EDLD = getIntValue(et_Ext_DLD);
EEDC = getIntValue(et_Ext_EDC);
EBEE = getIntValue(et_Ext_BEE);
EEE_Lab = getIntValue(et_Ext_EELab);
EDS_Lab = getIntValue(et_Ext_DSLab);
//CALCULATIONS.
//INTERNAL TOTAL.
ITotal21 = (IPS+IMFCS+IDS+IDLD+IEDC+IBEE+IEE_Lab+IDS_Lab);
//EXTERNAL TOTAL.
ETotal21 = (EPS+EMFCS+EDS+EDLD+EEDC+EBEE+EEE_Lab+EDS_Lab);
//TOTAL.
Total21 = (ITotal21+ETotal21);
//PERCENTAGE.
Percentage21 = ((Total21/750)*100);
f21 = Float.toString(Percentage21);
//CREATING TOAST.
Toast.makeText(getBaseContext(),"Press Result",Toast.LENGTH_SHORT).show();
}
});
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();
}
});
}
//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;
}
private void disp(TextView tv,String s){
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
}
}
**RESULTACTIVITY**
<pre><code>
package com.jntuhcalculator.anu.jntuhcalculator;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
/**
* Created by anu on 18/9/15.
*/
public class FirstResult extends Activity {
EditText et_Total1,et_Percentage1;
Button btn_Exit1;
int sres1;
String sper1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result_first);
//INITIALISING VIEWS.
et_Total1 = (EditText) findViewById(R.id.et_Total1);
et_Percentage1 = (EditText) findViewById(R.id.et_Percentage1);
btn_Exit1 = (Button) findViewById(R.id.btn_Exit1);
//GETTING DATA FROM PREVIOUS ACTIVITY.
Bundle b = getIntent().getExtras();
sres1 = b.getInt("res1", 0);
sper1 = b.getString("per1");
//Converting Float Into String.
//f = Float.toString(sper1);
//SETTING RESULTS.
et_Total1.setText(sres1+"");
et_Percentage1.setText(sper1+"%");
//WHEN EXIT IS CLICKED.
btn_Exit1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getBaseContext(), YearDetails.class);
i.putExtra("Total",sres1);
startActivity(i);
finish();
System.exit(0);
}
});
}
}
答案 0 :(得分：0)
您无法在不同的活动之间发送值，我会给您一个示例，尝试一下。
语法就像这样
用于发送数据
String data = getIntent().getExtras().getString("keyName");
Intent intent = new Intent(ActivityOne.this, ActivityTwo.class);
intent.putExtra("keyName","value");
在ActivityTwo上接收
String value= getIntent().getStringExtra("keyName");
Intent intent = getIntent();
Bundle extras = intent.getExtras();
附加提示： -
所以你需要在FirstActivity中编辑
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();
}
});
以下活动相同。
仍然没有得到？实际上在你的FirstActivity中已经放了
Intent i = new Intent(FirstMarks.this,FirstResult.class);
Bundle b = new Bundle();
b.putInt("res1",Total1);
b.putString("per1",f1);
在你的第二次活动中。
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);
你发现你在两个地方都使用过 per1字符串，改变一下，这可能导致应用程序无法获取值（可能会提供其他字符串）。
在这部分中，您需要为要接收的第二个活动结果添加代码。
Bundle b = getIntent().getExtras();
sres1 = b.getInt("res1", 0);
sper1 = b.getString("per1");
希望有所帮助。