@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
//按下键盘上返回按钮
if (keyCode == KeyEvent.KEYCODE_BACK)
{
new AlertDialog.Builder(LoginActivity.this).setTitle("提示")
.setMessage("确认退出吗?")
.setIcon(R.drawable.icon)
.setPositiveButton("确定",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
android.os.Process.killProcess(android.os.Process.myPid()); // 结束进程
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
}
})
.show();
return true;
}
else
{
return super.onKeyDown(keyCode, event);
}
}
此时在 TabActivity无法监听keyevent,onKeyDown冲突了。
解决办法:
1.当继承TabActivity时,同学们是不是onKeyDown方法没用,那是应为冲突了,可以用dispatchKeyEvent方法
@Override
public boolean dispatchKeyEvent(KeyEvent event)
{
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0&&event.getAction() == KeyEvent.ACTION_DOWN ) {
new AlertDialog.Builder(MainActivity.this).setTitle("提示")
.setMessage("确认退出吗?")
.setIcon(R.drawable.icon)
.setPositiveButton("确定",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
new RequestCommandService().logoutReq();
android.os.Process.killProcess(android.os.Process.myPid()); // 结束进程
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
}
})
.show();
return false;
}
return super.dispatchKeyEvent(event);
}
可以解决问题,能监听到keyEvent事件,但会监听二次,弹出二个AlertDialog。
因此在if判断需要添加event.getAction() == KeyEvent.ACTION_DOWN就OK了
2.也可以到TabActivity的子Activity用onKeyDown
3.当有双重TabActivity时可以用
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_BACK && event.getRepeatCount()==0){
TouchListenerUtils.Back(this.getParent().getParent());//getParent().是指父类
return false;
}else{
return super.onKeyDown(keyCode, event);
}
}