Android：EditView统计用户输入的数量，限制输入！

来源：互联网发布：js元素节点举例编辑：程序博客网时间：2024/04/30 22:13

无论是发帖，还是个人签名，为了防止刷屏，我们一般限制EditView输入的字数！

由于实现很简单，我直接上代码了：

<EditText    android:id="@+id/ET"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text=""    android:hint="个性签名"    android:maxLength="32"/><TextView    android:id="@+id/tv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="32"    android:textColor="@android:color/holo_blue_light"    android:layout_gravity="right"/>

限制输入32个字，每输入一个就算显示剩余的输入数量，

然后超过32个字时将无法输入！

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.widget.EditText;import android.widget.TextView;public class TestOneActivity extends AppCompatActivity {    private TextView hasnum;    private EditText content;    int num = 32;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_test_one);        hasnum = (TextView) findViewById(R.id.tv);        content = (EditText) findViewById(R.id.ET);        hasnum.setText(num+"");//监听事件       content.addTextChangedListener(new TextWatcher() {          private CharSequence temp;          private int selectionStart;          private int selectionEnd;    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    public void onTextChanged(CharSequence s, int start, int before, int count) {       temp = s;     }        public void afterTextChanged(Editable s) {            int number = num - s.length();            hasnum.setText("" + number);            selectionStart = content.getSelectionStart();            selectionEnd = content.getSelectionEnd();            if (temp.length() > num) {             s.delete(selectionStart - 1, selectionEnd);            int tempSelection = selectionEnd;            content.setText(s);            content.setSelection(tempSelection);//设置光标在最后         }        }        });    }}

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