最近换了新工作，有幸进入了一家C轮互联网公司，算是达到了职业规划的近期目标吧。
比起之前的小公司确实各方面都正规完善了很多，就Android来说，工程中对很多组件都进行了自己的封装。
前一阶段刚入公司，比较忙，现在已经缓和下来了，所以准备继续学习并写博客进行记录总结。
回归正题，今天下午写了一个简单的自定义控件，限制字数并且实时显示字数的EditText。
类文件：
public class LimitScrollEditText extends LinearLayout {private String hint;private int maxLength;private EditText content;private TextView textCount;private TextWatcher textWatcher;public LimitScrollEditText(Context context) {this(context, null);}public LimitScrollEditText(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public LimitScrollEditText(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);initAttrs(attrs);initView(context);initData();}private void initAttrs(AttributeSet attrs) {TypedArray arr = getContext().obtainStyledAttributes(attrs, R.styleable.LimitScrollEditText);if (arr != null) {hint = arr.getString(R.styleable.LimitScrollEditText_hint);maxLength = arr.getInt(R.styleable.LimitScrollEditText_maxLength, 0);arr.recycle();}}private void initView(Context context) {inflate(context, R.layout.layout_limit_scroll_edittext, this);// 因为布局layout_limit_scroll_edittext使用了merge标签, 所以需要设置方向setOrientation(VERTICAL);content = (EditText) findViewById(R.id.content);textCount = (TextView) findViewById(R.id.textCount);}private void initData() {setHint(hint);setMaxLength(maxLength);setTextWatcher();}public void setHint(String hint) {if (!TextUtils.isEmpty(hint)) content.setHint(hint);}public void setMaxLength(int maxLength) {this.maxLength = Math.max(0, maxLength);content.setFilters(new InputFilter[]{new InputFilter.LengthFilter(this.maxLength)});setTextCount();}private void setTextWatcher() {textWatcher = new TextWatcher() {@Overridepublic void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}@Overridepublic void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}@Overridepublic void afterTextChanged(Editable editable) {setTextCount();}};content.addTextChangedListener(textWatcher);}private void setTextCount() {if (TextUtils.isEmpty(content.getText())) {textCount.setText("0/" + maxLength);} else {textCount.setText(content.getText().toString().length() + "/" + maxLength);}}}
xml文件：
<?xml version="1.0" encoding="utf-8"?><merge xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"><ScrollView android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:padding="10dp"><EditText android:id="@+id/content"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@null"android:textSize="14sp"tools:hint="请输入文字" /></ScrollView><TextView android:id="@+id/textCount"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_alignParentRight="true"android:gravity="right|center_vertical"android:paddingRight="10dp"android:textSize="14sp"tools:text="0/10" /></merge>
资源文件：
<?xml version="1.0" encoding="utf-8"?><resources><declare-styleable name="LimitScrollEditText"><attr name="hint" format="string" /><attr name="maxLength" format="integer" /></declare-styleable></resources>
使用起来，很简单，如下：
Activity文件：
public class LimitScrollEditTextActivity extends Activity {@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_limit_scroll_edittext);initView();}private void initView() {LimitScrollEditText limitScrollEditText = (LimitScrollEditText) findViewById(R.id.limitScrollEditText);limitScrollEditText.setMaxLength(200);limitScrollEditText.setHint("最多输入200字");}}
还有xml文件：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"xmlns:app="/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><com.example.tsnt.view.LimitScrollEditText.LimitScrollEditText android:id="@+id/limitScrollEditText"android:layout_width="match_parent"android:layout_height="100dp"app:hint="Hello world!"app:maxLength="10" /></LinearLayout>
效果图：
源代码地址：/tingshuonitiao/AndroidStudy.git
