Android - onclick, change TextView content , background colour and set visibility gone

Question

Hi I am very new to Android development. Here is my problem:

In have two activities as shown below.

Activity1.class XML--> has two buttons

Button1 (Id:@+id/btn1 , onclick:doTHIS) and Button2 (Id:@+id/btn2 , onclick:doTHAT)
Activity2.class XML--> has a TextView with this parameters

Textview (Id:@+id/texter , Text:@+string/text1 , background:#ffffff)

onClick of Button1, I want to go to Activity2 and change

the background of a TextView to #000000
the Text to @+sting/text2

onClick of Button2, I want go to Activity2 and

set the TextView to visible:gone (not visible)

I tried to do this with no results.

public void doTHIS(View view){
    TextView tv= (TextView)findViewById(R.id.texter);
    tv.setText(getResources().getString(R.string.text2));
    tv.setTextColor(Color.RED);
    tv.setVisibility(View.GONE);
    Intent intent = new Intent (this, Activity2.class);
    startActivity(intent);

Can anyone help me figure out how to solve my problem?

What is the problem you are facing? Is the Activity2 not launching? — Ajit Pratap Singh, Jan 25 '14 at 17:26
Thanks for your reply. It crashes on Activity2. Actually I know how to load the activity2. but I am not able to change the parameters of my textview (Textstring,Background and visibility). — user3210337, Jan 25 '14 at 17:32
thats the code of activity 2 import android.app.Activity;import android.os.Bundle;public class Lettore extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity2); } }; — user3210337, Jan 25 '14 at 17:42
I tried to write this : public void doTHIS(View view) { final TextView tv1=(TextView)findViewById(R.id.texter); tv1.setVisibility(View.GONE); but I get an error FATAL EXEPTION:main java.lang.IllegalStateException: Could not execute method of the activity at android.view.View$1.onClick etc etc — user3210337, Jan 25 '14 at 18:08

score 0 · Accepted Answer · edited May 23 '17 at 10:25

You can't change controls on another layout until it's loaded. In other words, when you're in Activity1, you can't change TextView that's in layout for Activity2.

I'm sure there are a couple of ways to achieve what you want though. One of them would be to pass a flag in an Intent to Activity2, indicating which button has been pressed, and act accordingly.

In Activity1, let's pass integer 1 if Button1 was pressed, and 2 if Button2 was pressed, so change your click listeners as follows:

public void doTHIS(View view) {
    Intent intent = new Intent(this, Activity2.class);
    intent.putExtra("button", 1);
    startActivity(intent);
}

and

public void doTHAT(View view) {
    Intent intent = new Intent(this, Activity2.class);
    intent.putExtra("button", 2);
    startActivity(intent);
}

In Activity2, in onCreate(), check which button called this activity, and do your changes (note: we're doing this AFTER setContentView()):

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity2);

    //now, let's check which button got us here
    int button = getIntent().getIntExtra("button", 1);

    TextView tv = (TextView) findViewById(R.id.texter);

    switch (button) {
        case 1:
            tv.setText(getResources().getString(R.string.text2));
            tv.setTextColor(Color.RED);
            //whatever else you want to do
            break;
        case 2:
            tv.setVisibility(View.GONE);
            break;    
    }

    //rest of your code
}

Read more on passing data between activities here and here.

Android - onclick, change TextView content , background colour and set visibility gone

1 Answers1