android 还可以输入多少个字符

来源：互联网发布：淘宝网店代销好吗编辑：程序博客网时间：2024/04/30 22:55

关键代码：

//监听输入字数    etContent.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count,int after) {                }                @Override            public void onTextChanged(CharSequence s, int start, int before ,int count) {                mTitle = etContent.getText().toString();                leftTextNum = getLeftTextNum();                tvLeft.setText("还可以输入:" + leftTextNum + "个字");            }            @Override            public void afterTextChanged(Editable s) {            }     });

实例：

  private void initData() {        //判断还可以输入多少个字数        etComment.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                String mWriteText = etComment.getText().toString();                String mLeftText = String.valueOf(256 - mWriteText.length());                tvPerWrite.setText("还可以输入: "+mLeftText+"个字符");            }            @Override            public void afterTextChanged(Editable s) {            }        });    }

<RelativeLayout        android:id="@+id/rl_comment_content"        android:layout_width="260dp"        android:layout_height="140dp"        android:layout_below="@+id/tv_comment"        android:layout_centerHorizontal="true"        android:layout_marginTop="20dp"        android:background="@drawable/comment_edittext">        <EditText            android:id="@+id/et_comment"            android:layout_width="match_parent"            android:layout_height="120dp"            android:background="@null"            android:gravity="top"            android:hint="填写您的评价和建议"            android:textColorHint="@color/color_cbccd1"            android:textSize="15sp"            android:maxLength="256"            />        <TextView            android:id="@+id/tv_per_write"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentBottom="true"            android:text="还可以输入"            android:textColor="@color/color_cbccd1"            android:textSize="14sp" />    </RelativeLayout>

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