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POAndroid Button setAlpha
 

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    <p>There are a set of buttons, I want to get the result:</p> <p>When I click one of them, first I divide them into two parts: the clicked one and the others. I'm trying to set different color or alpha value to different them.</p> <p>Now I use <code>setAlpha</code>, but when I change the value from <strong>0 to 255</strong>, it works, but when I change the value from <strong>255 to 0</strong> , it doesnot work. I don't know why.</p> <p>Maybe after I invoke the method<code>Button.setAlpha()</code>, I need invoke another method?</p> <p>my code:</p> <pre><code>public class MainActivity extends Activity { // button alpha value: minimize value public static int BUTTON_ALPHA_MIN = 0; // button alpha value: maximize value public static int BUTTON_ALPHA_MAX = 255; private LinearLayout centerRegion; private LinearLayout bottomRegion; private Button btnCheckIn; private Button btnReview; private Button btnMyCircles; private Button btnSettings; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // get all the widgets getAllWidgets(); // set buttons click response function btnCheckIn.setOnClickListener(new OnClickListener() { public void onClick(View v) { centerRegion.setBackgroundColor(android.graphics.Color.RED); btnReview.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnMyCircles.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnSettings.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnCheckIn.getBackground().setAlpha(BUTTON_ALPHA_MAX); } }); btnReview.setOnClickListener(new OnClickListener() { public void onClick(View v) { centerRegion.setBackgroundColor(android.graphics.Color.BLUE); btnCheckIn.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnMyCircles.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnSettings.getBackground().setAlpha(BUTTON_ALPHA_MIN); btnReview.getBackground().setAlpha(BUTTON_ALPHA_MAX); } }); btnMyCircles.setOnClickListener(new OnClickListener() { public void onClick(View v) { centerRegion.setBackgroundColor(android.graphics.Color.YELLOW); btnCheckIn.getBackground().setAlpha(BUTTON_ALPHA_MAX); btnReview.getBackground().setAlpha(BUTTON_ALPHA_MAX); btnSettings.getBackground().setAlpha(BUTTON_ALPHA_MAX); v.getBackground().setAlpha(BUTTON_ALPHA_MIN); } }); btnSettings.setOnClickListener(new OnClickListener() { public void onClick(View v) { centerRegion.setBackgroundColor(android.graphics.Color.MAGENTA); btnCheckIn.getBackground().setAlpha(BUTTON_ALPHA_MAX); btnReview.getBackground().setAlpha(BUTTON_ALPHA_MAX); btnMyCircles.getBackground().setAlpha(BUTTON_ALPHA_MAX); v.getBackground().setAlpha(BUTTON_ALPHA_MIN); } }); } /** * get all the widgets */ public void getAllWidgets() { this.centerRegion = (LinearLayout) this.findViewById(R.id.center_region); this.bottomRegion = (LinearLayout) this.findViewById(R.id.bottom_region); this.btnCheckIn = (Button) this.findViewById(R.id.button_check_in); this.btnReview = (Button) this.findViewById(R.id.button_review); this.btnMyCircles = (Button) this.findViewById(R.id.button_my_circles); this.btnSettings = (Button) this.findViewById(R.id.button_setting); } } </code></pre>
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