发送退格键事件以编辑文本

问题描述

我不知道如何从我自己的按钮向 EditText 发送退格键事件.这是我尝试过的:

I don't know how to send a backspace key event to a EditText from my own button. Here is what i tried:

Button backSpace=(Button)findViewById(R.id.backSpace_tab);
backSpace.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        text.dispatchKeyEvent(new  KeyEvent(KeyEvent.KEYCODE_DEL,KeyEvent.KEYCODE_P));
    }
});

推荐答案

来自Android 开发者文档:

public KeyEvent (int action, int code)

public KeyEvent (int action, int code)

创建一个新的关键事件.

Create a new key event.

参数
action 操作代码:ACTION_DOWN、ACTION_UP 或 ACTION_MULTIPLE.
代码 关键代码

Parameters
action Action code: either ACTION_DOWN, ACTION_UP, or ACTION_MULTIPLE.
code The key code

第一个参数应该是一个动作代码.在您的情况下，您应该使用 ACTION_DOWN，因为您想模拟一个按键:

The first parameter should be an action code. In your case you should use ACTION_DOWN, because you want to simulate a keypress:

public static final int ACTION_DOWN

public static final int ACTION_DOWN

getAction() 值:按键已被按下.

getAction() value: the key has been pressed down.

所以这应该有效:

@Override
public void onClick(View v)
{
    text.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL));
}

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