How to visible&invisible Imageview?

Question

1.00/5 (1 vote)

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Did I do something wrong?

well there're 2 button Visible and Invisible button. Click for do that to appear and disappear imageView1

Java

public class MainActivity extends Activity {
	ImageView imgView = (ImageView)findViewById(R.id.imageView1);
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button btnV = (Button)findViewById(R.id.btnV);
        Button btnInV = (Button)findViewById(R.id.btnInV);
        
        
        btnV.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
            	imgView.setVisibility(View.VISIBLE);
            }
        });
        btnInV.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
            	imgView.setVisibility(View.INVISIBLE);
            }
        });
    }
}

Posted 23-Jun-14 17:50pm

Eerven

Updated 23-Jun-14 20:24pm

v3

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Comments

Sergey Alexandrovich Kryukov 24-Jun-14 2:06am

Yes, you did a great deal of wrong. You did not explain what is your purpose, what did you want to achieve, what you expected, what did you get instead and why do you feel this is not what you wanted... :-)
—SA

TorstenH. 24-Jun-14 2:37am

where is the problem? what is the problem? please explain details.

1 solution

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Xiao Ling · Accepted Answer · 2014-06-23T20:40:00

You have to initialize the imageView in onCreate:

public class MainActivity extends Activity {
	ImageView imgView;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        imgView = (ImageView)findViewById(R.id.imageView1); // move the line here
        Button btnV = (Button)findViewById(R.id.btnV);
        Button btnInV = (Button)findViewById(R.id.btnInV);
        
        
        btnV.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
            	imgView.setVisibility(View.VISIBLE);
            }
        });
        btnInV.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
            	imgView.setVisibility(View.INVISIBLE);
            }
        });
    }
}