今天学习了监听EditView的内容变化。
主要实现代码为:
package demo.com.jay.buttondemo; import android.content.Context; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.text.Editable; import android.text.TextWatcher; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.EditText; /** * Created by coder-pig on 2015/7/16 0016. */ public class DelEditText extends EditText { private Drawable imgClear; private Context mContext; public DelEditText(Context context, AttributeSet attrs) { super(context, attrs); this.mContext = context; init(); } private void init() { imgClear = mContext.getResources().getDrawable(R.drawable.delete_gray); addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable editable) { setDrawable(); } }); } //绘制删除图片 private void setDrawable(){ if (length() < 1) setCompoundDrawablesWithIntrinsicBounds(null, null, null, null); else setCompoundDrawablesWithIntrinsicBounds(null, null, imgClear, null); } //当触摸范围在右侧时,触发删除方法,隐藏叉叉 @Override public boolean onTouchEvent(MotionEvent event) { if(imgClear != null && event.getAction() == MotionEvent.ACTION_UP) { int eventX = (int) event.getRawX(); int eventY = (int) event.getRawY(); Rect rect = new Rect(); getGlobalVisibleRect(rect); rect.left = rect.right - 100; if (rect.contains(eventX, eventY)) setText(""); } return super.onTouchEvent(event); } @Override protected void finalize() throws Throwable { super.finalize(); } }