Problem:
You get the below error upon compiling Android App.
[javac] Compiling 3 source files to C:\xxxx\Workspace\MyApp\bin\classes
[javac] C:\xxxx\Workspace\MyApp\src\com\akp\MyApp\MainActivity.java:28: error: no suitable method found for makeText(<anonymous OnKeyListener>,String,int)
[javac] Toast.makeText(this, "This is a toast!", Toast.LENGTH_SHORT).show();
[javac] ^
[javac] method Toast.makeText(Context,int,int) is not applicable
[javac] (actual argument <anonymous OnKeyListener> cannot be converted to Context by method invocation conversion)
[javac] method Toast.makeText(Context,CharSequence,int) is not applicable
[javac] (actual argument <anonymous OnKeyListener> cannot be converted to Context by method invocation conversion)
[javac] 1 error
Quick Solution:
Change
Toast.makeText(this, "This is a toast!", Toast.LENGTH_SHORT).show();
to
Toast.makeText(MainActivity.this, "This is a toast!", Toast.LENGTH_SHORT).show();
Solution Explained:
1. I had created a Toast in an EditText OnKeyListener in the onCreate method.
The toast used 'this' only.
I have found that inside an onKeyListener you must use the activity name before the 'this.
So it would be 'MainActivity.this' instead of just 'this'.
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
editText = (EditText) findViewById(R.id.editText);
editText.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
//If the event is a key-down event on the "enter" button
if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
//...
// Perform your action on key press here
Toast.makeText(this, "This is a toast, using this!", Toast.LENGTH_SHORT).show();
// ...
return true;
}
return false;
}
});
}
