Android reusable view and OnClickListener - include

Question

I am trying to implement a reusable view and create an OnClickListener that will work for all classes. My code is below:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout layout = (LinearLayout)findViewById(R.id.layout1);
Button button = (Button) findViewById(R.id.layout1).findViewById(R.id.button1);
Button button2 = (Button) findViewById(R.id.layout1).findViewById(R.id.button2);
Button button3 = (Button) findViewById(R.id.layout1).findViewById(R.id.button3);
applyListener(layout,listener);
applyListener(layout,listener);
applyListener(layout,listener);
}
OnClickListener listener = new OnClickListener() {
public void onClick(View view) {
switch (view.getId()){
case R.id.button1:
Toast.makeText(getApplicationContext(), "ONE",Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, P2.class);
startActivity(intent);
break;
case R.id.button2:
Toast.makeText(getApplicationContext(), "TWO",Toast.LENGTH_LONG).show();
Intent intent2 = new Intent(MainActivity.this, P3.class);
startActivity(intent2);
break;
case R.id.button3:
Toast.makeText(getApplicationContext(), "THREE",Toast.LENGTH_LONG).show();
Intent intent3 = new Intent(MainActivity.this, P4.class);
startActivity(intent3);
break;
}
}
private Context getContext() {
// TODO Auto-generated method stub
return null;
}
};
private static void applyListener(View child, OnClickListener listener) {
if (child == null)
return;
if (child instanceof ViewGroup) {
applyListener((ViewGroup) child, listener);
}
else if (child != null) {
if(child.getId() == R.id.button1) {
child.setOnClickListener(listener);
}
if(child.getId() == R.id.button2) {
child.setOnClickListener(listener);
}
if(child.getId() == R.id.button3) {
child.setOnClickListener(listener);
}
}
}
private static void applyListener(ViewGroup parent, OnClickListener listener) {
for (int i = 0; i < parent.getChildCount(); i++) {
View child = parent.getChildAt(i);
if (child instanceof ViewGroup) {
applyListener((ViewGroup) child, listener);
} else {
applyListener(child, listener);
}
}
}
}
The problem is that once it moves out of the MainActivty, it will crash as soon as I press any button. I am sure it is to do with the line:
Intent intent = new Intent(MainActivity.this, P2.class);
and I think the problem is related to the fact that it is referencing a class that is not active eg MainActivity.this. I have tried replacing MainActivity.this with:
this
and
getContext()
and
getBaseContext()
but they do not work.
I have also tried
Intent intent = new Intent("com.example.APANEL.P2.class");
but this does not work either.
I am sure the applyListener method is being implemented properly as the buttons are all children and are therefore being implemented using the method:
private static void applyListener(ViewGroup parent, OnClickListener listener)
I have read the android documentation and every post I can find, but I cannot seem to find a working solution.
Any help would be greatly apreciated

Answer 1

I solved it myself by doing the following:
In the MainActivity class I created the method:
public void setup(){
LinearLayout layout = (LinearLayout)findViewById(R.id.layout1);
Button button = (Button) findViewById(R.id.layout1).findViewById(R.id.button1);
Button button2 = (Button) findViewById(R.id.layout1).findViewById(R.id.button2);
Button button3 = (Button) findViewById(R.id.layout1).findViewById(R.id.button3);
applyListener(layout,listener);
}
Then, all classes that re-use the view eg display the button panel must extend MainActivity, and in the onCreate() method, they implement the method setup()
To summarise, it was nothing to do with the Intent, but was to do with the fact that in the subsequent classes, the listeners were not set up.