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POI can't change the color of the background with a click button
 

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  1. POI can't change the color of the background with a click button
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    <p>I'm trying to change the color of the background by clicking button. For example: clicking “Y” should make it yellow, “G” green, and so on, but clicking the buttons doesn’t change anything. I’ve only implemented two buttons, but they didn’t work. Can anybody tell me where I’m going wrong?</p> <p>This my activity:</p> <pre class="lang-java prettyprint-override"><code>import android.os.Bundle; import android.app.Activity; import android.graphics.Color; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity implements OnClickListener { // Declare UI elements private Button firstButton; private Button secondButton; private ImageView changeBackground; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Our only layout for this app is main.xml // Initialize the UI components changeBackground = (ImageView) findViewById(R.id.backGround); firstButton = (Button) findViewById(R.id.button1); // When we creating a button and if we expect that to use for event handling we have to set the listener firstButton.setOnClickListener(this); secondButton = (Button) findViewById(R.id.button2); secondButton.setOnClickListener(this); } // Have to implement with the OnClickListner // onClick is called when a view has been clicked. @Override public void onClick(View v) { // Parameter v stands for the view that was clicked. if(v.getId() == R.id.button1){ // setText() sets the string value of the TextView changeBackground.setBackgroundColor(Color.RED); }else if(v.getId() == R.id.button2){ changeBackground.setBackgroundColor(Color.BLACK); } } } </code></pre> <p>and my XML: </p> <pre class="lang-xml prettyprint-override"><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:background="#CCEEFF" tools:context=".MainActivity" &gt; &lt;ImageView android:id="@+id/backGround" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /&gt; &lt;Button android:id="@+id/button1" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/backGround" android:layout_alignParentBottom="true" android:text="@string/white" /&gt; &lt;Button android:id="@+id/button2" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/button1" android:layout_alignBottom="@+id/button1" android:layout_toRightOf="@+id/button1" android:text="@string/black" /&gt; &lt;Button android:id="@+id/button3" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/button2" android:layout_alignBottom="@+id/button2" android:layout_toRightOf="@+id/button2" android:text="@string/red" /&gt; &lt;Button android:id="@+id/button4" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/button3" android:layout_alignBottom="@+id/button3" android:layout_toRightOf="@+id/button3" android:text="@string/yellow" /&gt; &lt;Button android:id="@+id/button5" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/button4" android:layout_alignBottom="@+id/button4" android:layout_toRightOf="@+id/button4" android:text="@string/green"/&gt; &lt;/RelativeLayout&gt; </code></pre>
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    1. PO
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    1. PTQuestion
    1. USalexwlchan
    1. USjaimito
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    1. This table or related slice is empty.
    1. PO
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      1. POI can't change the color of the background with a click button
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
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      1. VTUpMod
    1. COso you want change the background of `imageview`? what is the source of that? I think your code is right.But you must set source for your image to test that
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      1. POI can't change the color of the background with a click button
      1. USShayan Pourvatan
    2. COyou can test your code with `firstButton.setBackgroundColor(Color.RED);`
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      1. POI can't change the color of the background with a click button
      1. USShayan Pourvatan
    3. COI just want to change the background to color RED, and if I press antoher button to another color and so on...
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      1. POI can't change the color of the background with a click button
      1. USjaimito
 

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