Question

android中back键怎么重写并调用

Answer 1

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub

if(keyCode==KeyEvent.KEYCODE_BACK){
//弹出确定退出对话框
new AlertDialog.Builder(this)
.setTitle("退出")
.setMessage("确定退出吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
System.exit(0);
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel();
}
})
.show();
//这里不需要执行父类的点击事件，所以直接return
return true;
}
//继续执行父类的其他点击事件
return super.onKeyDown(keyCode, event);
}