Android-為ImageButton添加按下的動畫效果 變亮或變暗

Android中使用ImageButton的話，程序裡按下那個ImageButton時感覺不到任何按下的效果。

網上有2中經典的解決方案，一種是使用xml，一種是寫在代碼裡。

這裡我想要介紹另一種方法，使ImageButton有按下的特效，只需要準備一張普通的圖片，不需要按下效果的圖片。

直接看示例代碼，創建 TouchLight 和 TouchDark 這兩個 OnTouchListener，然後給 ImageButton 設置OnTouchListener就行了，如果使用TouchLight，則按下效果是按鍵變亮；另一個就是變暗。

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import android.app.Activity; import android.graphics.ColorMatrixColorFilter; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener;   public class TouchedAnimation extends Activity {   public static final OnTouchListener TouchLight = new OnTouchListener() {   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}; 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};   @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; } };   public static final OnTouchListener TouchDark = new OnTouchListener() {   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}; 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};   @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; } };   @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);   ImageButton ib1, ib2; ib1 = (ImageButton) findViewById(R.id.ImageButton01); ib2 = (ImageButton) findViewById(R.id.ImageButton02);   ib1.setOnTouchListener(TouchLight); ib2.setOnTouchListener(TouchDark); } }

代碼裡的兩個 float 數組裡存的東西是顏色矩陣，不瞭解顏色矩陣也沒關係，使用這個附件就行，只需調整亮度、對比度之類的值，然後把生產的顏色矩陣複製到代碼裡。