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    <p>As your <code>TextView</code> is in another <code>SecondActivity</code>.Firts You need to fetch it via XML through <code>setContentView()</code> and <code>findViewById()</code>, but as <code>FirstActivity</code> has already it's own <code>XML Layout</code>. Fetching <code>View</code> is totally wrong turn.</p> <p>You need to achieve your goal by pass value in a <code>Bundle</code> from <code>FirstActivity</code> to <code>SecondActivity</code> with some <code>Key</code> and fetch it there.</p> <p>Here is a snipped how you can achieve these: -</p> <pre><code> public void hello(View v) { Intent i1 = new Intent(firstActivity.this, SecondActivity.class); i.putExtra("KEY",YourData); // i.putExtra("greetings", "Hello"); --&gt; Hello is data and greeting is key to fetch from. startActivity(i1); finish(); } </code></pre> <p>In SecondActivity class</p> <p>You need fetch your <code>Bundle</code> which you sent from <code>FirstActivity</code> to <code>SecondActivity</code> and fetch <code>value</code> against the same <code>KEY</code> which you passed on from your <code>FirstActivity</code>.</p> <pre><code>Bundle extras = getIntent().getExtras(); if(extras !=null) { String value = extras.getString("KEY"); // String value = extras.getString("greetings"); --&gt; which will fetch data from key greetings to value. Thus value now contains Hello. TextView.setText(value); } </code></pre> <p>Note: Exception Thrown in your Case as you trying to call method <code>setText()</code> on <code>TextView</code> which is not even present in <code>FirstActivity</code>. That's the reason why RunTime throws <code>IllegalStateException</code></p>
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    1. POChaging textview from another activity
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    1. USKetan Ahir
    1. USVikalp Patel
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    1. COyou mean with value any text I want (hello) (how are you)
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    2. COTextView.setText(hello); or TextView.setText("hello");
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    3. CO@RoyJalbout : You need to pass the value with key mapping like `i.putExtra("greeting","How are you?")` and fetch on another activity with `String value = extras.getString("greeting");` and `TextView.setText(value);`
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