Android:如何通过右侧的交叉按钮清除EditText

Question

我创建了一个EditTextfor搜索,它在左侧包含一个搜索图标,在图标的右侧:

<EditText
    android:id="@+id/Search"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:drawableLeft="@android:drawable/ic_menu_search"
    android:drawableRight="@android:drawable/ic_delete"
    android:hint="Search Product .." >
</EditText>

我想知道如何清除EditText单击十字按钮时的内容.

先感谢您.

Answer 1

@aristo_sh 在EditText中处理drawable上的点击事件的改进答案

    mQueryEditText.setOnTouchListener(new OnTouchListener() {
        final int DRAWABLE_LEFT = 0;
        final int DRAWABLE_TOP = 1;
        final int DRAWABLE_RIGHT = 2;
        final int DRAWABLE_BOTTOM = 3;
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                int leftEdgeOfRightDrawable = mQueryEditText.getRight() 
                      - mQueryEditText.getCompoundDrawables()[DRAWABLE_RIGHT].getBounds().width();
                // when EditBox has padding, adjust leftEdge like
                // leftEdgeOfRightDrawable -= getResources().getDimension(R.dimen.edittext_padding_left_right);
                if (event.getRawX() >= leftEdgeOfRightDrawable) {
                    // clicked on clear icon
                    mQueryEditText.setText("");
                    return true;
                }
            }
            return false;
        }
    });

Answer 2

我更喜欢使用另一个可Edittex定制文本，如下所示。您可以在xml中将其用作普通的edittext。为了听清楚事件，你可以setListener为你的ClearableEdittext

/** Copyright 2014 Alex Yanchenko
 * To change clear icon, set
 * <p/>
 * <pre>
 * android:drawableRight="@drawable/custom_icon"
 * </pre>
 */
public class ClearableEditText extends EditText implements OnTouchListener,
        OnFocusChangeListener, TextWatcherAdapter.TextWatcherListener {

    public interface Listener {
        void didClearText();
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }

    private Drawable xD;
    private Listener listener;

    public ClearableEditText(Context context) {
        super(context);
        init();
    }

    public ClearableEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public ClearableEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    @Override
    public void setOnTouchListener(OnTouchListener l) {
        this.l = l;
    }

    @Override
    public void setOnFocusChangeListener(OnFocusChangeListener f) {
        this.f = f;
    }

    private OnTouchListener l;
    private OnFocusChangeListener f;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (getCompoundDrawables()[2] != null) {
            boolean tappedX = event.getX() > (getWidth() - getPaddingRight() - xD
                    .getIntrinsicWidth());
            if (tappedX) {
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    setText("");
                    if (listener != null) {
                        listener.didClearText();
                    }
                }
                return true;
            }
        }
        if (l != null) {
            return l.onTouch(v, event);
        }
        return false;
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            setClearIconVisible(!TextUtils.isEmpty(getText()));
        } else {
            setClearIconVisible(false);
        }
        if (f != null) {
            f.onFocusChange(v, hasFocus);
        }
    }

    @Override
    public void onTextChanged(EditText view, String text) {
        if (isFocused()) {
            setClearIconVisible(!TextUtils.isEmpty(text));
        }
    }

    private void init() {
        xD = getCompoundDrawables()[2];
        if (xD == null) {
            xD = getResources()
                    .getDrawable(android.R.drawable.presence_offline);
        }
        xD.setBounds(0, 0, xD.getIntrinsicWidth(), xD.getIntrinsicHeight());
        setClearIconVisible(false);
        super.setOnTouchListener(this);
        super.setOnFocusChangeListener(this);
        addTextChangedListener(new TextWatcherAdapter(this, this));
    }

    protected void setClearIconVisible(boolean visible) {
        Drawable x = visible ? xD : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], x, getCompoundDrawables()[3]);
    }
}

编辑：我忘了TextWatcherAdapter，实际上这只是客户TextWatcher：

public class TextWatcherAdapter implements TextWatcher {

public interface TextWatcherListener {

    void onTextChanged(EditText view, String text);

}

private final EditText view;
private final TextWatcherListener listener;

public TextWatcherAdapter(EditText editText, TextWatcherListener listener) {
    this.view = editText;
    this.listener = listener;
}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    listener.onTextChanged(view, s.toString());
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
                              int after) {
    // pass
}

@Override
public void afterTextChanged(Editable s) {
    // pass
}
}