Error after pressing a button

This question already has an answer here:

NullPointerException accessing views in onCreate() 12 answers

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试试这个代码

Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) 
{
 Toast.makeText(getApplicationContext(), "Button pressed.",Toast.LENGTH_LONG).show();  
}
});

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