Android自定义ImageView实现点击两张图片切换效果

private boolean flag;
public void onClick(View v){
 if(flag){
 mImageView.setImageResource(R.drawable.xx1); 
 }else{
 mImageView.setImageResource(R.drawable.xx2);
 }
 flag = !flag;
}

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


 //选中的src图片属性
 

public class SelectorImageView extends ImageView implements Checkable {
 private boolean isChecked;
 private Drawable mSelectorDrawable;
 private Drawable mDrawable;
 public SelectorImageView(Context context) {
 this(context, null);
 }
 public SelectorImageView(Context context, AttributeSet attrs) {
 this(context, attrs, 0);
 }
 public SelectorImageView(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 /**获取默认属性src的Drawable并用成员变量保存*/
 mDrawable = getDrawable();
 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SelectorImageView);
 /**获取自定义属性selector_src的Drawable并用成员变量保存*/
 Drawable d = a.getDrawable(R.styleable.SelectorImageView_selector_src);
 mSelectorDrawable = d;
 /**获取自定义属性checked的值并用成员变量保存*/
 isChecked = a.getBoolean(R.styleable.SelectorImageView_checked, false);
 setChecked(isChecked);
 if (d != null && isChecked) {
 /**如果在布局中设置了selector_src与checked = true，我们就要设置ImageView的图片为mSelectorDrawable */
  setImageDrawable(d);
 }
 a.recycle();
 }
 @Override
 public void setImageDrawable(Drawable drawable) {
 super.setImageDrawable(drawable);
 }
 @Override
 public void setChecked(boolean checked) {
 this.isChecked = checked;
 }
 @Override
 public boolean isChecked() {
 return isChecked;
 }
 @Override
 public void toggle() {
 /**此处依据是否选中来设置不同的图片*/
 if (isChecked()) {
  setImageDrawable(mSelectorDrawable);
 } else {
  setImageDrawable(mDrawable);
 }
 }
 public void toggle(boolean checked){
 /**外部通过调用此方法传入checked参数，然后把值传入给setChecked（）方法改变当前的选中状态*/
 setChecked(checked);
 toggle();
 }
}

public class MainActivity extends Activity {
 private SelectorImageView iv;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 iv = (SelectorImageView) findViewById(R.id.iv);
 iv.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  iv.toggle(!iv.isChecked());
  }
 });
 }
}