自己定义绘制android EditText的背景，定义EditText文字的显示样式

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mb5fd86dae5fbf6 2017-07-23 13:44:00

文章标签 android ide xml 2d i++ 文章分类 代码人生

EditText能够通过layer-list来绘制背景:

<?xml version="1.0" encoding="utf-8"?
>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
    <shape android:shape="rectangle" //框为矩形
        >
        <solid android:color="#FFFFFF" />  //用白色来填充里面
        <stroke //边框是1dp的线
            android:width="1dp"
            android:color="#AEAEAE"
            />
        <corners android:radius="10dp"/>  //边框的圆角的弧度
    </shape>
</item>
</layer-list>

写Layout:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="#FFFFFF"
     >

    <include 
        layout="@layout/title_list"
        />

    <View
        android:layout_below="@id/title"
        android:id="@+id/line"
        android:layout_width="fill_parent"
        android:layout_height="2dip"
        android:background="@drawable/rc_list_divider" />

     <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="150dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_centerInParent="true">

        <EditText
            android:id="@+id/custom_edittext"
            android:layout_width="fill_parent" 
            android:layout_height="150dp"  //跟parent height一致所以left_word_num能够在背景框里面
            android:background="@drawable/reply_custom_message_edit_background"
            android:gravity="left|top"
            android:hint="please inputsomething"
            android:paddingBottom="24dp"
            android:paddingLeft="12dp"
            android:paddingRight="12dp"
            android:paddingTop="17dp"
            android:textColor="#000000"
            android:textColorHint="#AEAEAE"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/other_char_hint"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@id/custom_edittext"
            android:layout_alignParentBottom="true"
            android:paddingBottom="10dp"
            android:paddingLeft="12dp"
            android:text="0"
            android:textColor="#AEAEAE"
            android:textSize="14sp"
            android:visibility="gone"></TextView>

        <TextView
            android:id="@+id/left_word_num"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:paddingBottom="10dp"
            android:paddingRight="10dp"
            android:text="200"
            android:textColor="#000000"
            android:textSize="14sp"></TextView>
    </RelativeLayout>

</RelativeLayout>

代码中实现一些EditText变化的时候处理逻辑(眼下的逻辑是不让输入中文字符:

private EditText mCustom_edittext;
  private TextView left_word_num;
  private static final int MAX_INPUT_NUM = 200;
  private TextView other_char_hint;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.edittext);
    mCustom_edittext = (EditText)findViewById(R.id.custom_edittext);
    other_char_hint = (TextView)findViewById(R.id.other_char_hint);
    other_char_hint.setText("only enlish accepted");
    left_word_num = (TextView) findViewById(R.id.left_word_num);
    mCustom_edittext.addTextChangedListener(new TextWatcher() {

      private CharSequence temp;
      private int selectionStart;
      private int selectionEnd;

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

      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        temp = s;
      }

      @Override
      public void afterTextChanged(Editable s) {
        selectionStart = mCustom_edittext.getSelectionStart();
        selectionEnd = mCustom_edittext.getSelectionEnd();

        String lastword = s.toString().trim();
        if (lastword.length() > 0) {
          lastword = lastword.substring(lastword.length() - 1, lastword.length());
          if(!isContentValid(temp.toString())) {
            other_char_hint.setVisibility(View.VISIBLE);
            for(int i=0;i < temp.toString().length();i++) {
              String temp1 = temp.toString().substring(i, i+1);
              if(!isInputValid(temp1)) {
                //使用setSpan使EditText字底下画黑线 
                s.setSpan(new UnderlineSpan(), i, i+1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
              }
            }
          }else{
            other_char_hint.setVisibility(View.GONE);
          }

        }else{
          other_char_hint.setVisibility(View.GONE);
        }
        left_word_num.setText(String.valueOf(MAX_INPUT_NUM - temp.length()));

      }

    });

  }

  private boolean isContentValid(String content) {
    for(int i=0;i < content.length(); i++) {
      String value = content.substring(i,i+1);
      if(!isInputValid(value)) {
        return false;
      }
    }
    return true;
  }

  private boolean isInputValid(String s) {
    byte[] ch_array = s.getBytes();
    if (ch_array.length == 1) {
      return true;
    } else {
      return false;
    }
  }