DEMO:呼吸灯按钮、smoothbutton、使用一组图片设置按钮背景、setLevel
1.attrs属性：
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<resources>
<string name=
"app_name"
>EX_templete</string>
<string name=
"action_settings"
>Settings</string>
<string name=
"hello_world"
>Hello world!</string>
<declare-styleable name=
"SmoothButton"
>
<attr name=
"transitionDrawable"
format=
"reference"
/>
<attr name=
"transitionDrawableLength"
format=
"integer"
/>
<attr name=
"transitionTextColorUp"
format=
"color"
/>
<attr name=
"transitionTextColorDown"
format=
"color"
/>
</declare-styleable>
</resources>
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2.layout设置：
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<RelativeLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
xmlns:misc=
"http://schemas.android.com/apk/res/com.example.ex_templete"
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"
tools:context=
".MainActivity"
>
<TextView
android:id=
"@+id/textView1"
android:layout_width=
"wrap_content"
android:layout_height=
"wrap_content"
android:text=
"@string/hello_world"
/>
<com.example.ex_templete.SmoothButton
android:layout_width=
"fill_parent"
android:layout_height=
"wrap_content"
android:background=
"@drawable/red_button"
android:text=
"smooth button 1"
misc:transitionDrawable=
"@drawable/red_transition_list"
misc:transitionDrawableLength=
"8"
misc:transitionTextColorDown=
"#aaa"
misc:transitionTextColorUp=
"#eee"
/>
</RelativeLayout>
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3.自定义控件SmoothButton类：
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import
android.content.Context;
import
android.content.res.TypedArray;
import
android.graphics.Color;
import
android.graphics.drawable.Drawable;
import
android.graphics.drawable.LevelListDrawable;
import
android.os.Handler;
import
android.os.Message;
import
android.util.AttributeSet;
import
android.view.KeyEvent;
import
android.view.MotionEvent;
import
android.widget.Button;
public
class
SmoothButton
extends
Button
{
private
static
final
long
DELAY =
25
;
private
int
transitionDrawableLength;
private
int
level;
private
int
[] colors;
private
boolean
wasPressed;
private
Drawable background;
public
SmoothButton(Context context, AttributeSet attrs)
{
super
(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SmoothButton);
LevelListDrawable transitionDrawable = (LevelListDrawable) a.getDrawable(R.styleable.SmoothButton_transitionDrawable);
transitionDrawableLength = a.getInt(R.styleable.SmoothButton_transitionDrawableLength,
0
);
int
useTextColors =
0
;
int
c0 =
0
;
if
(a.hasValue(R.styleable.SmoothButton_transitionTextColorUp))
{
c0 = a.getColor(R.styleable.SmoothButton_transitionTextColorUp,
0
);
useTextColors++;
}
int
c1 =
0
;
if
(useTextColors ==
1
&& a.hasValue(R.styleable.SmoothButton_transitionTextColorDown))
{
c1 = a.getColor(R.styleable.SmoothButton_transitionTextColorDown,
0
);
useTextColors++;
}
a.recycle();
if
(transitionDrawable ==
null
)
{
throw
new
RuntimeException(
"transitionDrawable must be defined in XML (with valid xmlns)"
);
}
if
(transitionDrawableLength ==
0
)
{
throw
new
RuntimeException(
"transitionDrawableLength must be defined in XML (with valid xmlns)"
);
}
if
(useTextColors ==
2
)
{
setTextColor(c0);
int
a0 = Color.alpha(c0);
int
r0 = Color.red(c0);
int
g0 = Color.green(c0);
int
b0 = Color.blue(c0);
int
a1 = Color.alpha(c1);
int
r1 = Color.red(c1);
int
g1 = Color.green(c1);
int
b1 = Color.blue(c1);
colors =
new
int
[transitionDrawableLength];
for
(
int
i =
0
; i < transitionDrawableLength; i++)
{
int
ai = a0 + i * (a1 - a0) / transitionDrawableLength;
int
ri = r0 + i * (r1 - r0) / transitionDrawableLength;
int
gi = g0 + i * (g1 - g0) / transitionDrawableLength;
int
bi = b0 + i * (b1 - b0) / transitionDrawableLength;
colors[i] = Color.argb(ai, ri, gi, bi);
}
}
int
[] viewAttrs =
{ android.R.attr.background };
a = context.obtainStyledAttributes(attrs, viewAttrs);
boolean
has a.hasValue(
0
);
a.recycle();
if
(!hasBackground)
{
int
l = getPaddingLeft();
int
t = getPaddingTop();
int
r = getPaddingRight();
int
b = getPaddingBottom();
setBackgroundDrawable(transitionDrawable);
setPadding(l, t, r, b);
}
background = getBackground();
level =
0
;
background.setLevel(level);
//通过此方法设置一组图片为背景**************************************
}
@Override
public
boolean
onKeyDown(
int
keyCode, KeyEvent event)
{
boolean
rc =
super
.onKeyDown(keyCode, event);
if
((keyCode == KeyEvent.KEYCODE_ENTER || keyCode == KeyEvent.KEYCODE_DPAD_CENTER) && event.getRepeatCount() ==
0
&& level +
1
< transitionDrawableLength)
{
handler.removeMessages(-
1
);
handler.sendEmptyMessageDelayed(
1
, DELAY);
}
return
rc;
}
@Override
public
boolean
onKeyUp(
int
keyCode, KeyEvent event)
{
boolean
rc =
super
.onKeyUp(keyCode, event);
if
((keyCode == KeyEvent.KEYCODE_ENTER || keyCode == KeyEvent.KEYCODE_DPAD_CENTER) && event.getRepeatCount() ==
0
&& level >
0
)
{
handler.removeMessages(
1
);
handler.sendEmptyMessageDelayed(-
1
, DELAY);
}
return
rc;
}
@Override
public
boolean
onTouchEvent(MotionEvent event)
{
wasPressed = isPressed();
boolean
rc =
super
.onTouchEvent(event);
post(checkPressed);
return
rc;
}
Runnable checkPressed =
new
Runnable()
{
public
void
run()
{
if
(!wasPressed && isPressed())
{
if
(level +
1
< transitionDrawableLength)
{
handler.removeMessages(-
1
);
handler.sendEmptyMessageDelayed(
1
, DELAY);
}
}
else
if
(wasPressed && !isPressed())
{
if
(level >
0
)
{
handler.removeMessages(
1
);
handler.sendEmptyMessageDelayed(-
1
, DELAY);
}
}
}
};
private
Handler handler =
new
Handler()
{
@Override
public
void
handleMessage(Message msg)
{
int
what = msg.what;
level += what;
if
(level >=
0
&& level < transitionDrawableLength)
{
background.setLevel(level);
if
(colors !=
null
)
{
setTextColor(colors[level]);
}
sendEmptyMessageDelayed(what, DELAY);
}
else
{
level = Math.max(
0
, level);
level = Math.min(transitionDrawableLength -
1
, level);
}
}
};
}
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4.MainActivity
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import
android.os.Bundle;
import
android.app.Activity;
import
android.view.Menu;
public
class
MainActivity
extends
Activity
{
@Override
protected
void
onCreate(Bundle savedInstanceState)
{
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public
boolean
onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return
true
;
}
}
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本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1228577，如需转载请自行联系原作者
