android view增加点击效果,如点击时变暗。

网上方法太多了，这里抄2个方法，不知道有没有效果，还没验证过：

1.使ImageButton有按下的特效，只需要准备一张普通的图片，不需要按下效果的图片。

直接看示例代码，创建 TouchLight 和 TouchDark 这两个 OnTouchListener，然后给 ImageButton 设置OnTouchListener就行了，如果使用TouchLight，则按下效果是按键变亮；另一个就是变暗。

 

01 import android.app.Activity;
02 import android.graphics.ColorMatrixColorFilter;
03 import android.view.MotionEvent;
04 import android.view.View;
05 import android.view.View.OnTouchListener;
06
07 public class TouchedAnimation extends Activity {
08
09     public static final OnTouchListener TouchLight = new OnTouchListener() {
10
11         public final float[] BT_SELECTED = new float[] {1,0,0,0,50,0,1,0,0,50,0,0,1,0,50,0,0,0,1,0};
12         public final 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};
13
14         @Override
15         public boolean onTouch(View v, MotionEvent event) {
16             if (event.getAction() == MotionEvent.ACTION_DOWN) {
17                 v.getBackground().setColorFilter(
18                         new ColorMatrixColorFilter(BT_SELECTED));
19                 v.setBackgroundDrawable(v.getBackground());
20             } else if (event.getAction() == MotionEvent.ACTION_UP) {
21                 v.getBackground().setColorFilter(
22                         new ColorMatrixColorFilter(BT_NOT_SELECTED));
23                 v.setBackgroundDrawable(v.getBackground());
24             }
25             return false;
26         }
27     };
28
29     public static final OnTouchListener TouchDark = new OnTouchListener() {
30
31         public final float[] BT_SELECTED = new float[] {1,0,0,0,-50,0,1,0,0,-50,0,0,1,0,-50,0,0,0,1,0};
32         public final 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};
33
34         @Override
35         public boolean onTouch(View v, MotionEvent event) {
36             if (event.getAction() == MotionEvent.ACTION_DOWN) {
37                 v.getBackground().setColorFilter(
38                         new ColorMatrixColorFilter(BT_SELECTED));
39                 v.setBackgroundDrawable(v.getBackground());
40             } else if (event.getAction() == MotionEvent.ACTION_UP) {
41                 v.getBackground().setColorFilter(
42                         new ColorMatrixColorFilter(BT_NOT_SELECTED));
43                 v.setBackgroundDrawable(v.getBackground());
44             }
45             return false;
46         }
47     };
48
49         @Override
50     public void onCreate(Bundle savedInstanceState) {
51         super.onCreate(savedInstanceState);
52         setContentView(R.layout.main);
53
54         ImageButton ib1, ib2;
55                 ib1 = (ImageButton) findViewById(R.id.ImageButton01);
56                 ib2 = (ImageButton) findViewById(R.id.ImageButton02);
57
58                 ib1.setOnTouchListener(TouchLight);
59                 ib2.setOnTouchListener(TouchDark);
60     }
61 }

代码里的两个 float 数组里存的东西是颜色矩阵，不了解颜色矩阵也没关系，使用这个附件就行，只需调整亮度、对比度之类的值，然后把生产的颜色矩阵复制到代码里。

附件：ColorMatrixDemo.swf

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2.Android开发中，View的图片是动态生成的，我们需要增加点击效果。像iReader 的书架中的书籍，点击变暗。

使用很简单：

    ImageView iv = (ImageView) this.findViewById(R.id.image_view1);

    Drawable d = Drawable.createFromPath("picPath");

        StateListDrawable sld = createSLD(this, d);
        iv.setImageDrawable(sld);

///增加如下两个方法：

public Drawable createDrawable(Drawable d, Paint p) {

        BitmapDrawable bd = (BitmapDrawable) d;
        Bitmap b = bd.getBitmap();
        Bitmap bitmap = Bitmap.createBitmap(bd.getIntrinsicWidth(),
                bd.getIntrinsicHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(b, 0, 0, p); // 关键代码，使用新的Paint画原图，

        return new BitmapDrawable(bitmap);
    }


    /** 设置Selector。 本次只增加点击变暗的效果，注释的代码为更多的效果*/ 
    public StateListDrawable createSLD(Context context, Drawable drawable) {
        StateListDrawable bg = new StateListDrawable();
        Paint p = new Paint();
        p.setColor(0x40222222); //Paint ARGB色值，A = 0x40 不透明。RGB222222 暗色


        Drawable normal = drawable;
        Drawable pressed = createDrawable(drawable, p);
        // p = new Paint();
        // p.setColor(0x8000FF00);
        // Drawable focused = createDrawable(drawable, p);
        // p = new Paint();
        // p.setColor(0x800000FF);
        // Drawable unable = createDrawable(drawable, p);
        // View.PRESSED_ENABLED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_pressed,
                android.R.attr.state_enabled }, pressed);
        // View.ENABLED_FOCUSED_STATE_SET
        // bg.addState(new int[] { android.R.attr.state_enabled,
        // android.R.attr.state_focused }, focused);
        // View.ENABLED_STATE_SET
        bg.addState(new int[] { android.R.attr.state_enabled }, normal);
        // View.FOCUSED_STATE_SET
        // bg.addState(new int[] { android.R.attr.state_focused }, focused);
        // // View.WINDOW_FOCUSED_STATE_SET
        // bg.addState(new int[] { android.R.attr.state_window_focused },
        // unable);
        // View.EMPTY_STATE_SET
        bg.addState(new int[] {}, normal);
        return bg;
    }