我有很多微调器，用户需要从中选择值。那些是spinner1，spinner2，s1，s2，s3。 单击按钮 add 时，应该将微调器上的字符串传递到数据库中。但是在这里我用吐司替换它因为我仍然有错误，所以我用吐司测试它。
问题是应用程序会说不幸的是，__已停止，错误显示它与行[select* question-201 "Can you fix this?" "How much do repairs cost?" "Did you receive my order?" "When will my order be ready?" "Other"]
以下是完整代码：
add.setOnClickListener(this);错误logcat
public class try_spinner extends Activity implements AdapterView.OnItemSelectedListener, View.OnClickListener {
Spinner spinner1, sspinner2, s1, s2,s3;
String app_name,room_name, spinner2_text, s1_text,s2_text, s3_text;
Button add, cancel;
TextView app,room, text_s1,text_s2,text_s3;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.try_spinner);
DisplayMetrics dm=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width=dm.widthPixels;
int height=dm.heightPixels;
getWindow().setLayout((int) (width * .9), (int) (height * .7));
Bundle extras = getIntent().getExtras();
final String app_string = extras.getString("APPLIANCE_NAME");
final String room_string = extras.getString("APPLIANCE_ROOM");
app =(TextView)findViewById(R.id.app_name);
app.setText(app_string);
room =(TextView)findViewById(R.id.room_name);
room.setText(room_string);
text_s1 =(TextView)findViewById(R.id.text_s1);
text_s2 =(TextView)findViewById(R.id.text_s2);
text_s3 =(TextView)findViewById(R.id.text_s3);
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner1.setOnItemSelectedListener(this);
if(app_string.equals("Lighting")){
ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.lighting));
dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter2.notifyDataSetChanged();
spinner1.setAdapter(dataAdapter2);}
else if(app_string.equals("Shower Heater")) {
ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.shower_heater));
dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter2.notifyDataSetChanged();
spinner1.setAdapter(dataAdapter2);}
else {
ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.empty));
dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter2.notifyDataSetChanged();
spinner1.setAdapter(dataAdapter2);}
sspinner2 = (Spinner) findViewById(R.id.spinner2);
s1 = (Spinner) findViewById(R.id.s1);
s2 = (Spinner) findViewById(R.id.s2);
s3 = (Spinner) findViewById(R.id.s3);
sspinner2.setOnItemSelectedListener(this);
s1.setOnItemSelectedListener(this);
s2.setOnItemSelectedListener(this);
s3.setOnItemSelectedListener(this);
final Button add = (Button) findViewById(R.id.add_info);
add.setOnClickListener(this);
final Button cancel = (Button) findViewById(R.id.cancel_add);
cancel.setOnClickListener(this);
}
@Override
public void onClick(View v) { //need intent status
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.add_info:
if (spinner2_text.contentEquals("Daily")) {
Toast.makeText(getBaseContext(), "its daily" + s1_text +s2_text, Toast.LENGTH_LONG).show();
} else if (spinner2_text.contentEquals("Monthly")) {
Toast.makeText(getBaseContext(), "its daily" + s1_text +s2_text, Toast.LENGTH_LONG).show();
}break;
case R.id.cancel_add:
Toast.makeText(getBaseContext(), "canceling", Toast.LENGTH_LONG).show();
break;
}
}
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
Spinner clickedSpinner = (Spinner) parent;
switch (clickedSpinner.getId()) {
case R.id.spinner2:
spinner2_text = String.valueOf(sspinner2.getSelectedItem());
Toast.makeText(this, spinner2_text, Toast.LENGTH_SHORT).show();
if (spinner2_text.contentEquals("Daily")) {
ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.hours));
dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter1.notifyDataSetChanged();
s1.setAdapter(dataAdapter1);
text_s1.setText("hour(s)");
s1_text = String.valueOf(s1.getSelectedItem());
ArrayAdapter<String> dataAdapter6 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.minutes));
dataAdapter6.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter6.notifyDataSetChanged();
s2.setAdapter(dataAdapter6);
text_s2.setText("min(s)");
s2_text = String.valueOf(s2.getSelectedItem());
s3.getSelectedView();
s3.setEnabled(false);
text_s3.setText("");
Toast.makeText(getBaseContext(), "its daily" + s1_text +s2_text, Toast.LENGTH_LONG).show();
}else if(spinner2_text.contentEquals("Monthly")) {
ArrayAdapter<String> dataAdapter3 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.days));
dataAdapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter3.notifyDataSetChanged();
s1.setAdapter(dataAdapter3);
text_s1.setText("day(s)");
s1_text = String.valueOf(s1.getSelectedItem());
ArrayAdapter<String> dataAdapter4 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.hours));
dataAdapter4.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter4.notifyDataSetChanged();
s2.setAdapter(dataAdapter4);
text_s2.setText("hour(s)");
s2_text = String.valueOf(s2.getSelectedItem());
s3.getSelectedView();
s3.setEnabled(true);
ArrayAdapter<String> dataAdapter5 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.minutes));
dataAdapter5.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dataAdapter5.notifyDataSetChanged();
s3.setAdapter(dataAdapter5);
text_s3.setText("min(s)");
s3_text = String.valueOf(s3.getSelectedItem());
Toast.makeText(getBaseContext(), "its monthly" + s1_text +s2_text+ s3_text,Toast.LENGTH_LONG).show();
}
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
try_spinner.xml
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: FATAL EXCEPTION: main
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.shyan.electricconsumer160326/com.example.shyan.electricconsumer160326.try_spinner}: java.lang.NullPointerException
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5103)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:525)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: Caused by: java.lang.NullPointerException
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at com.example.shyan.electricconsumer160326.try_spinner.onCreate(try_spinner.java:180)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5133)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5103)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:525)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-30 01:35:53.978 3778-3778/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
将id添加到添加按钮
<Button
android:id="@+id/add_info"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Add"
android:layout_gravity="center_vertical"
android:background="#394141"
android:layout_margin="5dp"
android:textColor="#FFFFFF" />