Sqlite無法執行活動的方法

Question

我的日誌貓。

09-27 21:00:42.414: E/AndroidRuntime(29268): FATAL EXCEPTION: main 

09-27 21:00:42.414: E/AndroidRuntime(29268): java.lang.IllegalStateException: Could not execute method 
of the activity 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.view.View$1.onClick(View.java:3609) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.view.View.performClick(View.java:4102) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.view.View$PerformClick.run(View.java:17085) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.os.Handler.handleCallback(Handler.java:615) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.os.Handler.dispatchMessage(Handler.java:92) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.os.Looper.loop(Looper.java:155) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.app.ActivityThread.main(ActivityThread.java:5511) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at java.lang.reflect.Method.invokeNative(Native Method) 
09-27 21:00:42.414: E/AndroidRuntime(29268): at java.lang.reflect.Method.invoke(Method.java:511) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at dalvik.system.NativeStart.main(Native Method) 

09-27 21:00:42.414: E/AndroidRuntime(29268): Caused by: java.lang.reflect.InvocationTargetException 

09-27 21:00:42.414: E/AndroidRuntime(29268): at java.lang.reflect.Method.invokeNative(Native Method) 
09-27 21:00:42.414: E/AndroidRuntime(29268): at java.lang.reflect.Method.invoke(Method.java:511) 

09-27 21:00:42.414: E/AndroidRuntime(29268): at android.view.View$1.onClick(View.java:3604) 
09-27 21:00:42.414: E/AndroidRuntime(29268): ... 11 more 

09-27 21:00:42.414: E/AndroidRuntime(29268): Caused by: java.lang.NullPointerException 

09-27 21:00:42.414: E/AndroidRuntime(29268): at 
com.shikkhok.taskmanagement.MainActivity.save(MainActivity.java:38) 

，這是我的MainActivity

public class MainActivity extends Activity { 

    EditText etName, etEmail, etPhone, etDesignation; 
    DatabaseHelper dbHelper; 

    // declare view 
    ListView lvEmployees; 
    // declare adapter 
    CustomizedAdapter adapter; 

    // datasource 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     etName = (EditText) findViewById(R.id.etName); 
     etEmail = (EditText) findViewById(R.id.etEmail); 


     lvEmployees = (ListView) findViewById(R.id.lvEmployees); 
     dbHelper = new DatabaseHelper(this); 
    } 

    public void save(View v) { 
     String name = etName.getText().toString(); 
     String email = etEmail.getText().toString(); 
     String phone = etPhone.getText().toString(); 
     String designation = etDesignation.getText().toString(); 

     Employee employee = new Employee(name, email, phone, designation); 
     Toast.makeText(getApplicationContext(), employee.toString(), 
       Toast.LENGTH_LONG).show(); 

     long inserted = dbHelper.insertEmployee(employee); 
     if (inserted >= 0) { 
      Toast.makeText(getApplicationContext(), "Data inserted", 
        Toast.LENGTH_LONG).show(); 
     } else { 
      Toast.makeText(getApplicationContext(), "Data insertion failed...", 
        Toast.LENGTH_LONG).show(); 
     } 

    } 

    public void view(View v) { 
     ArrayList<Employee> employees = dbHelper.getAllEmployees(); 
     if (employees != null && employees.size() > 0) { 
      adapter = new CustomizedAdapter(this, employees); 
      lvEmployees.setAdapter(adapter); 
     } 


    } 

} 

當我按下保存按鈕，此logcat的錯誤顯示在我的Eclipse如何解決它。

Answer 1

晴，因爲它從你的代碼和logcat的看來，錯誤是

String phone = etPhone.getText().toString(); 
String designation = etDesignation.getText().toString(); 

這些行。

在您的onCreate中，您初始化了etName和etEmail。但不是etPhone或etDesignation

您需要初始化它們，就像您使用etName和etEmail所做的那樣。

etName = (EditText) findViewById(R.id.etName); 
etEmail = (EditText) findViewById(R.id.etEmail); 
etName = (EditText) findViewById(R.id.etPhone); 
etEmail = (EditText) findViewById(R.id.etDesignation); 

希望它有幫助。