假设做一个精美的Login界面(攻克了一EditText自带clear的功能,相似iphone的UITextField)

先上图:

   

XML为:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:layout_gravity="center_horizontal">

      <ImageButton
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:background="@null"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/btn_icon"
        android:textColor="#0A84BD"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/custom_edittext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/btn_margin_left_right"
        android:layout_marginRight="@dimen/btn_margin_left_right"
        android:background="@drawable/animation_edit_background"
        android:gravity="left|center_vertical"
        android:hint="username"
        android:layout_marginTop="20dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
         android:maxLength="25"
        android:textColor="#000000"
        android:textColorHint="#AEAEAE"
        android:textSize="16sp" />

    <EditText
        android:id="@+id/password"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/btn_margin_left_right"
        android:layout_marginRight="@dimen/btn_margin_left_right"
        android:background="@drawable/animation_edit_background"
        android:gravity="left|center_vertical"
        android:hint="password"
        android:inputType="phone|numberDecimal"
        android:layout_marginTop="10dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:maxLength="25"
        android:textColor="#000000"
        android:textColorHint="#AEAEAE"
        android:textSize="16sp" />

    <Button
        android:id="@+id/btn_confirm"
        android:layout_width="fill_parent"
        android:gravity="center"
        android:text="确定"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:background="@drawable/button_item_selector"
        android:textColor="#ffffff"
        android:textSize="16sp" />

</LinearLayout>

重要的是EditText和Button的样式:

关于EditText:

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FFFFFF" />
    <stroke
        android:width="1dp"
        android:color="#000000" />
    <corners android:radius="@dimen/default_button_radius" />
    <padding
        android:bottom="@dimen/default_button_padding"
        android:left="@dimen/default_button_padding"
        android:right="@dimen/default_button_padding"
        android:top="@dimen/default_button_padding" />
</shape>

Button:

<?xml version="1.0" encoding="utf-8"?

>

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#0A84BD" />
    <corners android:radius="@dimen/default_button_radius" />
    <padding
        android:bottom="@dimen/default_button_padding"
        android:left="@dimen/default_button_padding"
        android:right="@dimen/default_button_padding"
        android:top="@dimen/default_button_padding" />
</shape>

让EditText自带clear的功能，能够用在EditText的右側增加一个clear的小图标来实现:

我们用setCompoundDrawablesWithIntrinsicBounds来做，这个函数是在控件的Left,Top,Right,Button设置图标。非常实用:

	final int btn_margin_left_right = this.getResources().getDimensionPixelSize(R.dimen.btn_margin_left_right);
		final EditText custom_edittext = (EditText) findViewById(R.id.custom_edittext);
		custom_edittext.addTextChangedListener(new TextWatcher() {
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count, int after) {
			}

			@Override
			public void afterTextChanged(Editable s) {
			}

			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {

				if (s.length() > 0) {
					custom_edittext.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.search_bar_close_btn, 0);
				} else {
					custom_edittext.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
				}

			}
		});

为了捕捉用户点击clear图标的事件，要捕捉onTouch事件，在用户抬起手的时候推断假设手指的坐标在clear的图标那里，就清楚EditText的文字:

custom_edittext.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                final int DRAWABLE_RIGHT = 2;
                if(event.getAction() == MotionEvent.ACTION_UP) {
                    Drawable[] compoundDrawables = custom_edittext.getCompoundDrawables();
                    if(compoundDrawables != null) {
                        Drawable image = compoundDrawables[DRAWABLE_RIGHT];

                        if(image != null) {
                            int leftMargin = custom_edittext.getRight() - custom_edittext.getPaddingRight() - image.getBounds().width() - btn_margin_left_right;
                            if(event.getX() >= leftMargin) {
                                if (custom_edittext != null && custom_edittext.getEditableText() != null) {
                                	custom_edittext.getEditableText().clear();
                                }
                            }
                        }
                    }
                }
                return false;
            }
        });

代码能够在http://blog.csdn.net/baidu_nod/article/details/37655327下载