我的应用由一项活动组成。当我按下后没有任何反应,这是为什么呢?我认为它会杀死应用程序。如果我按 home 键,应用程序会根据需要在后台继续运行。只是后退按钮什么都不做。我能做些什么来影响这一点?
我已在文档中阅读:
public void onBackPressed ()
当活动检测到用户按下后退键时调用。默认实现只是完成当前活动,但您可以覆盖它来做任何您想做的事情。
我没有覆盖这个。
这是已经提到的,覆盖键的东西:
public boolean dispatchKeyEvent(KeyEvent event) {
if (event == null || event.getAction() == KeyEvent.ACTION_UP) {
return false;
}
if(event.getKeyCode() == KeyEvent.KEYCODE_DEL){
mEntry.setOnFocusChangeListener(new OnFocusChangeListener(){
@Override
public void onFocusChange(View v,boolean hasFocus){
/* When focus is lost check that the text field
* has valid values.
*/
if (!hasFocus && !mEntry.getText().toString().trim().equals("")) {
mSession.appendToEmulator(cmdLeft, 0, cmdLeft.length);
mSession.appendToEmulator(cmdErase, 0, cmdErase.length);
Log.d(TAG, "in inner delete");
}
else {mEntry.setText(" ");
}
}
});
Log.d(TAG, "in delete in delete in delete in delete");
try {
sendOverSerial("\b".getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return super.dispatchKeyEvent(event);
};
另一个片段,来自 onCreate:
mEntry = (EditText) findViewById(R.id.term_entry);
mEntry.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId,
KeyEvent event) {
/* Ignore enter-key-up events. */
if (event != null && event.getAction() == KeyEvent.ACTION_UP) {
return false;
}