有一组按钮,我想要得到的结果是:的Android按键setAlpha
当我点击其中的一个,首先我将它们分为两个部分:点击一个和其他人。我试图为不同的颜色或Alpha值设置不同的颜色。
现在我用setAlpha
,但是当我改变从0到255的价值,它的工作原理,但是当我从255至0更改值,它亘古不变的工作。我不知道为什么。
也许在我调用方法Button.setAlpha()
后,我需要调用另一个方法?
我的代码:
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);
}
}
我试一下,但很遗憾它不起作用 – 2010-07-16 06:17:34
@ZHAO我找到了一个解决方案 - 在上面编辑了我的代码。祝你好运! – 2010-07-16 06:55:03
非常感谢你。它运作良好,谢谢你! – 2010-07-16 12:14:08