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Editorial Team
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Editorial Team
Asked: June 13, 20262026-06-13T01:58:20+00:00 2026-06-13T01:58:20+00:00

sample = (Button) findViewById(R.id.sampleButton); sample.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO

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sample = (Button) findViewById(R.id.sampleButton);
sample.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        // TODO Auto-generated method stub
    }
});

When I try to load my Activity, it throws a null pointer exception on the Listener. Why? I have defined my button variable globally.

Button sample;
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  1. Editorial Team
    Editorial Team
    2026-06-13T01:58:22+00:00Added an answer on June 13, 2026 at 1:58 am

    Your button sampleButton is probably not in the layout you passed to setContentView(). findViewById() can only find views that are currently displayed.

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