将4个微调项目读取到另一个4微调器

时间：2015-10-19 03:47:31

标签： java android sqlite spinner

有人可以帮我查一下我的代码有什么问题吗？我在spinner中有4个WorkDetails，其中spinner1,2,3 and 4的名称为SQLite，其值已插入spinner1,2,3,4。现在，我想在project1,project2,project3,project4中显示所选项目 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); dbHelper = new MyDatabaseHelper(this); setContentView(R.layout.updatepage); final String name = getIntent().getExtras().getString("name1"); final String date=getIntent().getExtras().getString("date1"); final String ID = getIntent().getExtras().getString("ID"); RetrievePage(name,date,ID); } public void addProject1(String c) { project1=(Spinner)findViewById(R.id.spinner8); String[] arr = new String[]{"Pro-XXX-XXX","TRN-XXX-XXX","SRV-XXX-XXX","PRO-REE-BERGARDING","PRO-SKM-SSS","PRO-SKM-DI","PRO-SKM-PACKING","PRO-SIE-AVAGO_S110", "PRO-SIE-BIOCON","PRO-BCM-T13/T17","TRIN-IN_HOUSE","TRIN-EXTERNAL","SRIV-SIE-LEMONGRASS","SRV-PW-SIMOCODE","SRV-REE-SIMOCODE","PRO-SKM-D5","PRO-SKM-DRIOU","PRO-BKI-DESMET", "PRO-BKI-INFINEON","PRO-INH-ANDROID","PRO-BCM-S120","PRO-GAW-OP"}; List<String> list = new ArrayList<String>(); String project11 = c; list.add(project11); for(String s:arr){ if(!list.contains(s)){ list.add(s); } } ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdatePage.this, android.R.layout.simple_spinner_dropdown_item, list); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); project1.setAdapter(adapter); } public void addProject2(String d) { project2=(Spinner)findViewById(R.id.spinner9); String[] arr = new String[]{"Pro-XXX-XXX","TRN-XXX-XXX","SRV-XXX-XXX","PRO-REE-BERGARDING","PRO-SKM-SSS","PRO-SKM-DI","PRO-SKM-PACKING","PRO-SIE-AVAGO_S110", "PRO-SIE-BIOCON","PRO-BCM-T13/T17","TRIN-IN_HOUSE","TRIN-EXTERNAL","SRIV-SIE-LEMONGRASS","SRV-PW-SIMOCODE","SRV-REE-SIMOCODE","PRO-SKM-D5","PRO-SKM-DRIOU","PRO-BKI-DESMET", "PRO-BKI-INFINEON","PRO-INH-ANDROID","PRO-BCM-S120","PRO-GAW-OP"}; List<String> list = new ArrayList<String>(); String project22 = d; list.add(project22); for(String s:arr){ if(!list.contains(s)){ list.add(s); } } ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdatePage.this, android.R.layout.simple_spinner_dropdown_item, list); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); project2.setAdapter(adapter); } public void addProject3(String e) { project3=(Spinner)findViewById(R.id.spinner13); String[] arr = new String[]{"Pro-XXX-XXX","TRN-XXX-XXX","SRV-XXX-XXX","PRO-REE-BERGARDING","PRO-SKM-SSS","PRO-SKM-DI","PRO-SKM-PACKING","PRO-SIE-AVAGO_S110", "PRO-SIE-BIOCON","PRO-BCM-T13/T17","TRIN-IN_HOUSE","TRIN-EXTERNAL","SRIV-SIE-LEMONGRASS","SRV-PW-SIMOCODE","SRV-REE-SIMOCODE","PRO-SKM-D5","PRO-SKM-DRIOU","PRO-BKI-DESMET", "PRO-BKI-INFINEON","PRO-INH-ANDROID","PRO-BCM-S120","PRO-GAW-OP"}; List<String> list = new ArrayList<String>(); String project33 = e; list.add(project33); for(String s:arr){ if(!list.contains(s)){ list.add(s); } } ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdatePage.this, android.R.layout.simple_spinner_dropdown_item, list); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); project3.setAdapter(adapter); } public void addProject4(String f) { project4=(Spinner)findViewById(R.id.spinner14); String[] arr = new String[]{"Pro-XXX-XXX","TRN-XXX-XXX","SRV-XXX-XXX","PRO-REE-BERGARDING","PRO-SKM-SSS","PRO-SKM-DI","PRO-SKM-PACKING","PRO-SIE-AVAGO_S110", "PRO-SIE-BIOCON","PRO-BCM-T13/T17","TRIN-IN_HOUSE","TRIN-EXTERNAL","SRIV-SIE-LEMONGRASS","SRV-PW-SIMOCODE","SRV-REE-SIMOCODE","PRO-SKM-D5","PRO-SKM-DRIOU","PRO-BKI-DESMET", "PRO-BKI-INFINEON","PRO-INH-ANDROID","PRO-BCM-S120","PRO-GAW-OP"}; List<String> list = new ArrayList<String>(); String project44 = f; list.add(project44); for(String s:arr){ if(!list.contains(s)){ list.add(s); } } ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdatePage.this, android.R.layout.simple_spinner_dropdown_item, list); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); project4.setAdapter(adapter); } public void RetrievePage(String name,String date, String id) { final String name2 = name; final String date2=date; final String id2 = id; final EditText name3 = (EditText) findViewById(R.id.editText9); final EditText date3 = (EditText) findViewById(R.id.editText12); final EditText per1=(EditText) findViewById(R.id.editText20); final EditText per2=(EditText) findViewById(R.id.editText24); final EditText per3=(EditText) findViewById(R.id.editText28); final EditText per4=(EditText) findViewById(R.id.editText32); database = dbHelper.getWritableDatabase(); c = database.rawQuery("SELECT i.Weather, i.Status,w.Subcontractors, w.NumberOfPerson, w.NumberOfHours, wd.Project, wd.WorkDescription, wd.Per, wd.TimeIn, wd.TimeOut FROM Information i LEFT JOIN WorkForce w ON w.TInfo_id = i._id LEFT JOIN WorkDetails wd ON wd.Twf_id=w._id WHERE i.Name = ? AND i._id= ? ", new String[]{String.valueOf(name2),String.valueOf(id2)}, null); if (c != null) { while (c.moveToNext()) { Details WD = new Details(); String Weather = c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Weather)); String Project11=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Project)); String Project22=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Project)); String Project33=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Project)); String Project44=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Project)); String Per1=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Per)); String Per2=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Per)); String Per3=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Per)); String Per4=c.getString(c.getColumnIndexOrThrow(MyDatabaseHelper.Per)); addProject1(Project11); addProject2(Project22); addProject3(Project33); addProject4(Project44); addWeather(Weather); WD.setProject(Project11); WD.setProject(Project22); WD.setProject(Project33); WD.setProject(Project44); WD.setPer(Per1); WD.setPer(Per2); WD.setPer(Per3); WD.setPer(Per4); per1.setText(Per1); per2.setText(Per2); per3.setText(Per3); per4.setText(Per4); } } c.close(); } 微调，但未能这样做。

我已检查过每一步但仍无法解决问题。

Update.java 

  Process: com.example.project.project, PID: 2364
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
            at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:401)
            at android.widget.ArrayAdapter.getView(ArrayAdapter.java:369)
            at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:194)
            at android.widget.Spinner.onMeasure(Spinner.java:580)
            at android.support.v7.widget.AppCompatSpinner.onMeasure(AppCompatSpinner.java:410)
            at android.view.View.measure(View.java:18788)
            at android.view.ViewGroup.measureChild(ViewGroup.java:5922)
            at android.view.ViewGroup.measureChildren(ViewGroup.java:5899)
            at android.widget.AbsoluteLayout.onMeasure(AbsoluteLayout.java:66)

错误LogCat 

public void addWeather(String a) {
    weather3 = (Spinner) findViewById(R.id.spinner5);
    String[] arr = new String[]{"Sunny","Cloudy","Rainy","Thunderstorm"};
    List<String> list = new ArrayList<String>();
    String weather = a;
    list.add(weather);
    for(String s:arr){
        if(!list.contains(s)){
            list.add(s);
        }
    }
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdatePage.this, android.R.layout.simple_spinner_dropdown_item, list);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    weather3.setAdapter(adapter);
}

我有一个活动有一个微调器，下面的代码对我来说很好。

{{1}}

1 个答案:

答案 0 :(得分：0)

由于异常似乎发生在您的代码之外（但与您的代码有些相关），您可能希望在每个方法的开头放置断点，并查看应用程序崩溃的位置以帮助阐明问题。或者，将日志打印放在每个方法的开头和结尾，以查看哪个方法开始并且无法结束，并帮助检测问题所在。

我的猜测是你将null作为参数传递给你的一个addProject（）方法，这会导致列表包含一个null对象，然后当适配器尝试在该null上调用toString（）方法时对象，你得到错误。此对象也可以隐式传递，例如，作为您忘记初始化的变量。你可以做的是检查参数是否为null，只有当它不是，将它添加到列表中，或者如果参数为null或者实现你想要的任何逻辑，则在它的start处退出方法。

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