我正在制作一个包含一个主要活动和另外11个活动的应用程序，这11个活动中的每个活动必须返回一个值，主要活动应该将这些值一起添加并在文本视图中显示总数，开始它只是给了我最后一次活动的总数，所以我尝试通过共享首选项发送值并在主活动中将它们一起添加
这是我主要活动的代码：
package cafe.al_sheikhabuhamzehcafe;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class ItemMenu extends AppCompatActivity {
Button cDrinks;
Button hDrinks;
Button sandwiches;
Button snacks;
Button meat;
Button chickenarrayes;
Button water;
Button snooker;
Button billiards;
Button qallayat;
Button hookah;
TextView total;
public static String BToatal = "BilliardsTotal";
public static String STotal = "SnookerTotal";
public static final String MyPREFERENCES = "MyPrefs" ;
SharedPreferences sharedpreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_menu);
cDrinks = ( Button ) findViewById ( R.id. cDrinks ) ;
hDrinks = ( Button ) findViewById ( R.id. hDrinks ) ;
sandwiches = ( Button ) findViewById ( R.id. sandwiches ) ;
snacks = ( Button ) findViewById ( R.id. snacks ) ;
meat = ( Button ) findViewById ( R.id. meat ) ;
chickenarrayes = ( Button ) findViewById ( R.id. chickenarrayes ) ;
water = ( Button ) findViewById ( R.id. water ) ;
snooker = ( Button ) findViewById ( R.id. snooker ) ;
billiards = ( Button ) findViewById ( R.id. billiards ) ;
qallayat = ( Button ) findViewById ( R.id. qallayat ) ;
hookah = ( Button ) findViewById ( R.id. hookah ) ;
total = ( TextView ) findViewById ( R.id. total ) ;
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_WORLD_READABLE);
}
public void cDrinks (View v)
{
Intent cd= new Intent(getApplicationContext(),ColdDrinks.class);
startActivity(cd);
}
public void hDrinks (View v)
{
Intent hd = new Intent(getApplicationContext(),HotDrinks.class);
startActivity(hd);
}
public void qallayat (View v)
{
Intent q = new Intent(getApplicationContext(),Qallayat.class);
startActivity(q);
}
public void sandwiches (View v)
{
Intent sand = new Intent(getApplicationContext(),Sandwiches.class);
startActivity(sand);
}
public void snacks (View v)
{
Intent snack = new Intent(getApplicationContext(),Snacks.class);
startActivity(snack);
}
public void meat (View v)
{
Intent sawanee = new Intent(getApplicationContext(),SawaneeMeat.class);
startActivity(sawanee);
}
public void chickenarr (View v)
{
Intent chicken = new Intent(getApplicationContext(),Chicken.class);
startActivity(chicken);
}
public void water (View v)
{
Intent water = new Intent(getApplicationContext(),ColdWater.class);
startActivity(water);
}
public void hookah (View v)
{
Intent hookah = new Intent(getApplicationContext(),Hookahs.class);
startActivity(hookah);
}
public void billiards (View v)
{
Intent billiards = new Intent(this,Billiards.class);
startActivityForResult(billiards,9710);
}
public void snooker (View v)
{
Intent snooker = new Intent(this,Snooker.class);
startActivityForResult(snooker,9711);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==9710) {
if (resultCode == RESULT_OK) {
String billiardstot = data.getStringExtra("btot");
BToatal = String.valueOf(billiardstot);
String bt = String.valueOf(billiardstot);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(billiardstot, bt);
editor.commit();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Wrong Request Code", Toast.LENGTH_LONG).show();
}
}
if (requestCode==9711) {
if (resultCode == RESULT_OK) {
String snookertot = data.getStringExtra("stot");
STotal = String.valueOf(snookertot);
String st = String.valueOf(snookertot);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(snookertot, st);
editor.commit();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Wrong Result Code", Toast.LENGTH_LONG).show();
}
}
}
public void totcalc (View v)
{
sharedpreferences.getString(BToatal,null);
sharedpreferences.getString(STotal,null);
Intent gettot = getIntent();
Double imfromcd = gettot.getDoubleExtra("cdtot",0 ) ;
Double imfromhd = gettot.getDoubleExtra("hdtot",0 ) ;
Double imfromq = gettot.getDoubleExtra("qtot", 0 ) ;
Double imfromsand = gettot.getDoubleExtra("sandtot",0);
Double imfromsnack = gettot.getDoubleExtra("snacktot",0);
Double imfromsawanee = gettot.getDoubleExtra("sawaneetot",0);
Double imfromchicken = gettot.getDoubleExtra("chtot",0);
Double imfromcw = gettot.getDoubleExtra("cwtot",0);
Double imfromh = gettot.getDoubleExtra("htot",0);
String gtotal = String.valueOf(STotal) + String.valueOf(BToatal) + imfromcd + imfromhd + imfromq + imfromsand + imfromsnack + imfromsawanee + imfromchicken + imfromcw + imfromh;
total.setText(String.valueOf(gtotal));
}
@Override
public void onBackPressed() {
finish();
super.onBackPressed();
}
}
到目前为止我只做台球和斯诺克活动..
所以，这是Billiards Activity的代码：
package cafe.al_sheikhabuhamzehcafe;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.Preference;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.prefs.Preferences;
public class Billiards extends AppCompatActivity {
EditText ebgames;
Button bsave;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_billiards);
ebgames = (EditText)findViewById(R.id.ebgames);
bsave = ( Button )findViewById(R.id. bsave);
}
public void bsave (View v)
{
Double dbgames = Double.parseDouble(ebgames.getText().toString());
Double calcbgames = (dbgames)*0.50;
Double btotal = (calcbgames);
Intent billiards=new Intent();
billiards.putExtra("btot",String.valueOf(btotal));
setResult(9710,billiards);
finish();
}
@Override
public void onBackPressed() {
Double dbgames = Double.parseDouble(ebgames.getText().toString());
Double calcbgames = (dbgames)*0.50;
Double btotal = (calcbgames);
Intent billiards=new Intent();
billiards.putExtra("btot",String.valueOf(btotal));
setResult(9710,billiards);
finish();
super.onBackPressed();
}
}
这是斯诺克活动的代码：
package cafe.al_sheikhabuhamzehcafe;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class Snooker extends AppCompatActivity {
EditText esgames;
Button ssave;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_snooker);
esgames = (EditText)findViewById(R.id.esgames);
ssave = ( Button )findViewById(R.id. ssave);
}
public void ssave (View v)
{
Double dsgames = Double.parseDouble(esgames.getText().toString());
Double calcsgames = (dsgames)*1.00;
Double stotal = (calcsgames);
Intent snooker=new Intent();
snooker.putExtra("stot",String.valueOf(stotal));
setResult(9711,snooker);
finish();
}
@Override
public void onBackPressed() {
Double dsgames = Double.parseDouble(esgames.getText().toString());
Double calcsgames = (dsgames)*1.00;
Double stotal = (calcsgames);
Intent snooker=new Intent();
snooker.putExtra("stot",String.valueOf(stotal));
setResult(9711,snooker);
finish();
super.onBackPressed();
}
}
问题是，当我按下按钮时，它应该计算每个活动的总数，显示“BilliardsTotalSnookerTotal（和其他活动的其余部分）”，我不知道如何获得正确的值或总数到主要活动
提前致谢：）
答案 0 :(得分：0)
1）您的 BToatal 和 STotal 充当键，因此无需在onActivityResult中为其指定值。
2）在totcalc（View v）方法中，您将尝试获取相对于键的值。 值为字符串类型，因此如果直接对String执行add操作，它将连接字符串。而是将这些字符串转换为双，然后执行添加。 由于TextView的setText（CharSequence text）方法采用String，最后将 totalValue 转换为字符串。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==9710) {
if (resultCode == RESULT_OK) {
String billiardstot = data.getStringExtra("btot");
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(BToatal, billiardstot);
editor.commit();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Wrong Request Code", Toast.LENGTH_LONG).show();
}
}
if (requestCode==9711) {
if (resultCode == RESULT_OK) {
String snookertot = data.getStringExtra("stot");
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(STotal, snookertot);
editor.commit();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Wrong Result Code", Toast.LENGTH_LONG).show();
}
}
}
public void totcalc (View v)
{
String billiardstotTotal = sharedpreferences.getString(BToatal,null);
String snookerTotal = sharedpreferences.getString(STotal,null);
Intent gettot = getIntent();
Double imfromcd = gettot.getDoubleExtra("cdtot",0 ) ;
Double imfromhd = gettot.getDoubleExtra("hdtot",0 ) ;
Double imfromq = gettot.getDoubleExtra("qtot", 0 ) ;
Double imfromsand = gettot.getDoubleExtra("sandtot",0);
Double imfromsnack = gettot.getDoubleExtra("snacktot",0);
Double imfromsawanee = gettot.getDoubleExtra("sawaneetot",0);
Double imfromchicken = gettot.getDoubleExtra("chtot",0);
Double imfromcw = gettot.getDoubleExtra("cwtot",0);
Double imfromh = gettot.getDoubleExtra("htot",0);
Double totalValue = imfromcd + imfromhd + imfromq + imfromsand + imfromsnack + imfromsawanee + imfromchicken + imfromcw + imfromh
totalValue += Double.valueOf(billiardstotTotal) + Double.valueOf(snookerTotal);
total.setText(String.valueOf(totalValue));
}
答案 1 :(得分：0)
在主要活动中做这样的事情
public void billiards (View v)
{
Intent billiards = new Intent(this,Billiards.class);
startActivity(billiards);
}
public void snooker (View v)
{
Intent snooker = new Intent(this,Snooker.class);
startActivity(snooker);
}
public void totcalc (View v)
{
double billiardsTotal = sharedpreferences.getFloat(BToatal,0);
double snookerTotal = sharedpreferences.getFloat(STotal,0);
double totalFromActivities = billiardsTotal + snookerTotal;
total.setText(String.valueOf(totalFromActivities));
}
然后在你的其他活动中做这个
public class Billiards extends AppCompatActivity {
EditText ebgames;
Button bsave;
public static String BToatal = "BilliardsTotal";
Double dbgames = 0;
Double calcbgames = 0;
SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_billiards);
ebgames = (EditText)findViewById(R.id.ebgames);
bsave = ( Button )findViewById(R.id. bsave);
sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_WORLD_READABLE);
}
public void bsave (View v)
{
dbgames = Double.parseDouble(ebgames.getText().toString());
calcbgames = (dbgames)*0.50;
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putFloat(BToatal,calcbgames);
editor.apply();
finish();
}
@Override
public void onBackPressed() {
dbgames = Double.parseDouble(ebgames.getText().toString());
calcbgames = (dbgames)*0.50;
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putFloat(BToatal,calcbgames);
editor.apply();
finish();
super.onBackPressed();
}
}
答案 2 :(得分：0)
处理 SharedPreferences 非常简单！
活动一，二，三：
在此创建数据并以共享首选项保存。 保存时，您可以使用该屏幕的预定义ID /名称来识别值的来源。 在每个活动中重复中的代码，并在存储值时使用相应的ID。
SharedPreferences sp = getSharedPreferences("YourSharedPreference", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
int VALUE_TO_PASS = <your value here>;
editor.putInt("ACTIVITY_ONE", VALUE_TO_PASS); //ACTIVITY_TWO,ACTIVITY_THREE...
editor.commit();
// Now screen shift
<强> MainActivity 在这里，您将使用用于保存值的SAME ID逐个检索值
SharedPreferences sp = getSharedPreferences("YourSharedPreference", Activity.MODE_PRIVATE);
int DEFAULT_FALLBACK_VALUE = 0; //When value is not received, show this
int VALUE_PASSED_ACTIVITY_1 = sp.getInt("ACTIVITY_ONE", DEFAULT_FALLBACK_VALUE);
int VALUE_PASSED_ACTIVITY_2 = sp.getInt("ACTIVITY_TWO", DEFAULT_FALLBACK_VALUE);
int VALUE_PASSED_ACTIVITY_3 = sp.getInt("ACTIVITY_THREE", DEFAULT_FALLBACK_VALUE);
int Total = VALUE_PASSED_ACTIVITY_1 + VALUE_PASSED_ACTIVITY_2 + ...;
将这些ID保存在常量类或静态最终数组中将比硬编码更好。