android gridview子项开始活动onclick

Question

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    if (position == 0) {
        Intent i = new Intent(this,second.class);
        startActivity(i);
    } else if (position == 1) {
        Intent i1 = new Intent(this,second.class);
        startActivity(i);
    }
}

I know this method but lets say for example i have 20 subitems so i need 20 activities !! how do i make it so only one activity is passed in but the data inside it changes depending on the subitem clicked ( by the data inside it i mean simple Textviews ) sorry my english is very bad

Answer 1

You can set a extra to the activity intent to indentify where you came from:

   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    Intent i = new Intent(this, second.class);
    i.putExtra("position", position);
    startActivity(i);
}

Then in your activity you can get the intent that like this:

int position;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity); //if your activities have different layouts depending the given position, you can move this line inside the switch function
    ...
    if(getIntent().getExtras() != null) {
        position = getIntent().getExtras().getInt("position", 0);
    }
    switch(position){
        case 1:
            //do something
            break;
        case 2:
            //do another thing
            break;
        default:
            //default behaviour
            break;
    }
}