[ad_1]
From activity_settings.xml
<EditText android:id="@+id/editText" android:text="text" />
<Button android:id="@+id/button" android:text="button"/>
From MyActivity.java
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
this.findViewById(R.id.button).setOnClickListener(
new View.OnClickListener()
@Override
public void onClick(View view)
EditText txt = (EditText) view.findViewById(R.id.editText);
Toast.makeText(view.getContext(),txt.getText(), Toast.LENGTH_SHORT).show();
);
...
If I click the button I get
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
Just for test I tried and succeeded
@Override
public void onClick(View view)
EditText txt = (EditText) view.findViewById(R.id.editText);
Toast.makeText(view.getContext(),txt.getText(),Toast.LENGTH_SHORT).show();
I don't get why button is ok but editText is null.
[ad_2]
لینک منبع
