android editText:检测用户何时停止编辑

Question

我有一个editText，它表示搜索条件的输入。我想知道是否有一种方法来检测用户何时停止编辑这个editText，这样我就可以查询数据库的数据为我的列表。例如，如果用户键入"test"，我希望只在用户键入单词之后才收到通知，而不是像文本监视器那样在用户键入每个字母之后才收到通知。你有什么主意吗?我会避免使用计时器来测量按键事件之间的毫秒间隔。

Answer 1

不是非常优雅，但应该可以工作。

初始化:

long idle_min = 4000; // 4 seconds after user stops typing
long last_text_edit = 0;
Handler h = new Handler();
boolean already_queried = false;

设置将从文本监视程序调用的可运行程序:

private Runnable input_finish_checker = new Runnable() {
    public void run() {
            if (System.currentTimeMillis() > (last_text_edit + idle_min - 500)) {
                 // user hasn't changed the EditText for longer than
                 // the min delay (with half second buffer window)
                 if (!already_queried) { // don't do this stuff twice.
                     already_queried = true;
                     do_stuff();  // your queries
                 }
            }
    }
};

把这个放到你的文本监视程序中:

last_text_edit = System.currentTimeMillis();
h.postDelayed(input_finish_checker, idle_min); 

Answer 2

首先创建以下字段:

private Date                _lastTypeTime   = null;

然后确保你的editText实现了' texttwatcher ':

_editText.addTextChangedListener(this);

那么，按如下方式重写接口的方法:

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{
    _lastTypeTime = new Date();
}
@Override
public void afterTextChanged(Editable arg0)
{
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{
    // dispatch after done typing (1 sec after)
    Timer t = new Timer();
    TimerTask tt = new TimerTask()
    {
        @Override
        public void run()
        {
            Date myRunTime = new Date();
            if ((_lastTypeTime.getTime() + 1000) <= myRunTime.getTime())
            {
                post(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        Log.d("<tag>", "typing finished!!!");
                    }
                });
            }
            else
            {
                Log.d("<tag>", "Canceled");
            }
        }
    };
    t.schedule(tt, 1000);
}

Answer 3

下面是你如何检测你正在寻找的事件。

声明和初始化:

private Timer timer = new Timer();
private final long DELAY = 1000; // in ms

监听器，例如onCreate()

EditText editText = (EditText) findViewById(R.id.editTextStopId);
    editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }
        @Override
        public void onTextChanged(final CharSequence s, int start, int before,
                int count) {
            if(timer != null)
                timer.cancel();
        }
        @Override
        public void afterTextChanged(final Editable s) {
            //avoid triggering event when text is too short
            if (s.length() >= 3) {              
                timer = new Timer();
                timer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        // TODO: do what you need here (refresh list)
                        // you will probably need to use
                        // runOnUiThread(Runnable action) for some specific
                        // actions
                        queryDB();
                    }
                }, DELAY);
            }
        }
    });

因此，当文本被更改时，计时器开始等待任何下一个更改发生。当它们发生时，计时器被取消，然后再次启动。

Answer 4

我就是这么做的!

long delay = 1000; // 1 seconds after user stops typing
long last_text_edit = 0;
Handler handler = new Handler();
private Runnable input_finish_checker = new Runnable() {
    public void run() {
        if (System.currentTimeMillis() > (last_text_edit + delay - 500)) {
            // TODO: do what you need here
            DoStaff();
        }
    }
};
EditText editText = (EditText) findViewById(R.id.editTextStopId);
editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
    }
    @Override
    public void onTextChanged(final CharSequence s, int start, int before,
            int count) {
         //You need to remove this to run only once
         handler.removeCallbacks(input_finish_checker);
    }
    @Override
    public void afterTextChanged(final Editable s) {
        //avoid triggering event when text is empty
        if (s.length() > 0) {              
          last_text_edit = System.currentTimeMillis();
          handler.postDelayed(input_finish_checker, delay);
        } else {
        }
    }
});

Answer 5

检查editText是否有文本(只有一次)的最简单方法是:

    private boolean newState;

  protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.somLayout);
    edt.addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    
                }
    
                @Override
                public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                }
    
                @Override
                public void afterTextChanged(Editable editable) {
                    if (!editable.trim().isEmpty()) {
                        checkIsTyping(true);
                    } else {
                        checkIsTyping(false);
                    }
                }
            });
}
    private void checkIsTyping(boolean typeState) {
            if (newState != typeState) {
                Toast.makeText(appCompatActivity, "typingState  " + newState, 
            Toast.LENGTH_SHORT).show();
            }
            newState = typeState;
    
        }