我们经常使用手机的打电话功能，当我们按键盘的时候，有一个地方显示我们按键的内容，当我们的手点击那个地方的时候，并没有弹出软件盘，所以我们再有数字键盘的时候，要屏蔽系统的软件盘。

我们分析一下，软件盘弹出的条件：

1、焦点，当EditText处于焦点的时候，会自动弹出软件盘，所以我们要重写onFocusChanged函数

2、触摸时间，当你点击EditText的时候，那它就会处于焦点，所以我们要重写onTouchEvent函数

3、当布局改变的时候，EditText也会处于焦点，所以我们也应该重写一下layout函数

package com.jwzhangjie.pjsip.ui.dialpad;

import android.content.Context;
import android.graphics.Rect;
import android.text.InputType;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityEvent;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

/**
 * 数字输入,暂时不支持字母输入所以把软键盘全部屏蔽
 * 
 * @author jwzhangjie
 */
public class DigitsEditText extends EditText {

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

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

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

	private void init() {
		//设置一行显示
		this.setInputType(InputType.TYPE_NULL);

	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		final boolean ret = super.onTouchEvent(event);
		// Must be done after super.onTouchEvent()
		applyKeyboardShowHide();
		return ret;
	}

	@Override
	public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
		if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED) {
			// Since we're replacing the text every time we add or remove a
			// character, only read the difference. (issue 5337550)
			final int added = event.getAddedCount();
			final int removed = event.getRemovedCount();
			final int length = event.getBeforeText().length();
			if (added > removed) {
				event.setRemovedCount(0);
				event.setAddedCount(1);
				event.setFromIndex(length);
			} else if (removed > added) {
				event.setRemovedCount(1);
				event.setAddedCount(0);
				event.setFromIndex(length - 1);
			} else {
				return;
			}
		} else if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {
			// The parent EditText class lets tts read "edit box" when this View
			// has a focus, which
			// confuses users on app launch (issue 5275935).
			return;
		}
		super.sendAccessibilityEventUnchecked(event);
	}

	@Override
	protected void onLayout(boolean changed, int left, int top, int right,
			int bottom) {
		super.onLayout(changed, left, top, right, bottom);
		// Here we ensure that we hide the keyboard
		// Since this will be fired when virtual keyboard this will probably
		// blink but for now no better way were found to hide keyboard for sure
		applyKeyboardShowHide();
	}

	@Override
	protected void onFocusChanged(boolean focused, int direction,
			Rect previouslyFocusedRect) {
		super.onFocusChanged(focused, direction, previouslyFocusedRect);
		if (focused) {
			applyKeyboardShowHide();
		} else {
			final InputMethodManager imm = ((InputMethodManager) getContext()
					.getSystemService(Context.INPUT_METHOD_SERVICE));
			if (imm != null && imm.isActive(this)) {
				imm.hideSoftInputFromWindow(getApplicationWindowToken(), 0);
			}
		}
	}

	private void applyKeyboardShowHide() {
		final InputMethodManager imm = ((InputMethodManager) getContext()
				.getSystemService(Context.INPUT_METHOD_SERVICE));
		if (imm != null) {
			if (imm.isActive(this)) {
				imm.hideSoftInputFromWindow(getApplicationWindowToken(), 0);
			}
		}
	}

}