EditText中onEditorAction监听事件执行两次

来源：互联网发布：什么软件看美剧最全编辑：程序博客网时间：2024/06/07 05:28

调试开源项目android_serialport_api时，遇到onEditorAction执行两次的问题

更具参考文档解释：Android的EditText通过setOnEditorActionListener给文本编辑框设置监听事件，但是在其处理方法onEditorAction中的逻辑在每次回车后都触发了两次，原来是在键盘回车的ACTION_UP和ACTION_DOWN时都会触发这个方法，后面添加打印信息的时候和这个说法稍微有点出入，求大神解释

原始代码为

Emission.setOnEditorActionListener(new OnEditorActionListener() {public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {int i;CharSequence t = v.getText();char[] text = new char[t.length()];for (i=0; i<t.length(); i++) {text[i] = t.charAt(i);}try {mOutputStream.write(new String(text).getBytes());mOutputStream.write('\n');} catch (IOException e) {e.printStackTrace();}return false;}});

添加打印信如下

public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {if (event == null)Log.d("chenzhen","chenzhen event null");if (event != null && event.getAction() == KeyEvent.ACTION_UP)Log.d("chenzhen","ACTION_UP");if (event != null && event.getAction() == KeyEvent.ACTION_DOWN)Log.d("chenzhen","ACTION_DOWN");if (actionId == EditorInfo.IME_ACTION_SEND)Log.d("chenzhen", "actionID is send");int i;CharSequence t = v.getText();char[] text = new char[t.length()];for (i=0; i<t.length(); i++) {text[i] = t.charAt(i);}Log.d("chenzhen", "chenzhen write");try {mOutputStream.write(new String(text).getBytes());mOutputStream.write('\n');} catch (IOException e) {e.printStackTrace();}return false;}

打印结果为

01-01 03:08:12.585  2736  2736 D chenzhen: chenzhen event null01-01 03:08:12.585  2736  2736 D chenzhen: actionID is send01-01 03:08:12.585  2736  2736 D chenzhen: chenzhen write01-01 03:08:12.625  2736  2736 D chenzhen: ACTION_DOWN01-01 03:08:12.625  2736  2736 D chenzhen: chenzhen write

根据结果可以分析

第一次调用时 event 是空的，第二次调用时event不为空且getAction()为ACTION_DOWN

第一次调用时actionID是IME_ACTION_SEND，第二次调用时不为IME_ACTION_SEND

所以过滤的方法有两种

1 通过actionID进行过滤，因为只有第一次的actionID为IME_ACTION_SEND

Emission.setOnEditorActionListener(new OnEditorActionListener() {public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {if (actionId == EditorInfo.IME_ACTION_SEND ) {int i;CharSequence t = v.getText();char[] text = new char[t.length()];for (i=0; i<t.length(); i++) {text[i] = t.charAt(i);}try {mOutputStream.write(new String(text).getBytes());mOutputStream.write('\n');} catch (IOException e) {e.printStackTrace();}}return false;}});

2 通过event函数是否为空进行过滤，因为第一次event函数为空，所以修改如下

Emission.setOnEditorActionListener(new OnEditorActionListener() {public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {if (event == NULL ) {int i;CharSequence t = v.getText();char[] text = new char[t.length()];for (i=0; i<t.length(); i++) {text[i] = t.charAt(i);}try {mOutputStream.write(new String(text).getBytes());mOutputStream.write('\n');} catch (IOException e) {e.printStackTrace();}}return false;}});

参考文章：http://blog.csdn.net/u010825468/article/details/42874709

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