Android——ImageButton按下效果设计

使用 Button 时为了让用户有“按下”的效果，有两种实现方式：

[b][b] 1.JAVA代码实现：[/b][/b]

imageButton.setOnTouchListener(new OnTouchListener(){

@Override

public boolean onTouch(View v, MotionEvent event) {

if(event.getAction() == MotionEvent.ACTION_DOWN){

//更改为按下时的背景图片

v.setBackgroundResource(R.drawable.pressed);

}else if(event.getAction() == MotionEvent.ACTION_UP){

//改为抬起时的图片

v.setBackgroundResource(R.drawable.released);

}

return false;

}

});

[b] 2.XML实现： [/b]

<?xml version="1.0" encoding="UTF-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android ">

<item android:state_pressed="false" android:drawable="@drawable/button_add" />

<item android:state_pressed="true" android:drawable="@drawable/button_add_pressed" />

<item android:state_focused="true" android:drawable="@drawable/button_add_pressed" />

<item android:drawable="@drawable/button_add" />

</selector>

[b]这个文件放在 drawable 目录下面。命名为 button_add_x.xml，使用方法如下：[/b]

<ImageButton android:id="@+id/ImageButton"

android:layout_width="wrap_content"

[b] android:layout_height="wrap_content"

android:background="#00000000"

android:src="@drawable/button_add_x" >

</ImageButton>

<ImageButton

android:id="@+id/ImageButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="#00000000"

android:src="@drawable/button_add_x" >

</ImageButton> [/b]

[b] 3.采用Drawable的颜色过滤：[/b]

/** 按下这个按钮进行的颜色过滤

[b] */

public final static float[] BT_SELECTED=new float[] {

2, 0, 0, 0, 2,

0, 2, 0, 0, 2,

0, 0, 2, 0, 2,

0, 0, 0, 1, 0 };

/**

* 按钮恢复原状的颜色过滤

*/

public final static float[] BT_NOT_SELECTED=new float[] {

1, 0, 0, 0, 0,

0, 1, 0, 0, 0,

0, 0, 1, 0, 0,

0, 0, 0, 1, 0 };

/**

* 按钮焦点改变

*/

public final static OnFocusChangeListener buttonOnFocusChangeListener=new OnFocusChangeListener() {

@Override

public void onFocusChange(View v, boolean hasFocus) {

if (hasFocus) {

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

else

{

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

}

};

/**

* 按钮触碰按下效果

*/

public final static OnTouchListener buttonOnTouchListener=new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

if(event.getAction() == MotionEvent.ACTION_DOWN){

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

else if(event.getAction() == MotionEvent.ACTION_UP){

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

return false;

}

};

/**

* 设置图片按钮获取焦点改变状态

* @param inImageButton

*/

public final static void setButtonFocusChanged(View inView)

{

inView.setOnTouchListener(buttonOnTouchListener);

inView.setOnFocusChangeListener(buttonOnFocusChangeListener);

}

/**

* 按下这个按钮进行的颜色过滤

*/

public final static float[] BT_SELECTED=new float[] {

2, 0, 0, 0, 2,

0, 2, 0, 0, 2,

0, 0, 2, 0, 2,

0, 0, 0, 1, 0 };

/**

* 按钮恢复原状的颜色过滤

*/

public final static float[] BT_NOT_SELECTED=new float[] {

1, 0, 0, 0, 0,

0, 1, 0, 0, 0,

0, 0, 1, 0, 0,

0, 0, 0, 1, 0 };

/**

* 按钮焦点改变

*/

public final static OnFocusChangeListener buttonOnFocusChangeListener=new OnFocusChangeListener() {

@Override

public void onFocusChange(View v, boolean hasFocus) {

if (hasFocus) {

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

else

{

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

}

};

/**

* 按钮触碰按下效果

*/

public final static OnTouchListener buttonOnTouchListener=new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

if(event.getAction() == MotionEvent.ACTION_DOWN){

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

else if(event.getAction() == MotionEvent.ACTION_UP){

v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));

v.setBackgroundDrawable(v.getBackground());

}

return false;

}

};

/**

* 设置图片按钮获取焦点改变状态

* @param inImageButton

*/

public final static void setButtonFocusChanged(View inView)

{

inView.setOnTouchListener(buttonOnTouchListener);

inView.setOnFocusChangeListener(buttonOnFocusChangeListener);

} [/b]