我正在使用Firebase实时数据库,并使用检索数据,我询问是否要在OnClick()
上为button
添加If方法并从实时数据库获取ActionView
链接,如果数据库中没有链接,则给出一条吐司消息"没有可用的链接ATM">
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.res_screen);
String data0= getIntent().getStringExtra("Name");
String data1= getIntent().getStringExtra("Address");
String data2= getIntent().getStringExtra("Phone1");
String data3= getIntent().getStringExtra("Phone2");
String data4= getIntent().getStringExtra("Phone3");
String data5= getIntent().getStringExtra("Offer");
final String data6= getIntent().getStringExtra("Facebook");
final String data7= getIntent().getStringExtra("Menu");
final String data8 = getIntent().getStringExtra("Menu");
TextView nm = findViewById(R.id.name);
TextView ad = findViewById(R.id.address);
TextView ph1 = findViewById(R.id.phone1);
TextView ph2 = findViewById(R.id.phone2);
TextView ph3 = findViewById(R.id.phone3);
TextView off = findViewById(R.id.closeoffer);
ImageView fb = findViewById(R.id.facebookbut);
Button menu = findViewById(R.id.menubut);
nm.setText(data0);
ad.setText(data1);
ph1.setText(data2);
ph2.setText(data3);
ph3.setText(data4);
off.setText(data5);
fb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(data6));
startActivity(intent);
}
});
menu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(getIntent().getStringExtra("Menu")));
startActivity(i);
}
});
}
也许我有点困惑,因为我的语言不好。我想将其他内容添加到 OnClick(( 中。意味 着。。如果此按钮具有访问ACTION_VIEW的链接,则转到。但是,如果没有从实时数据库链接,则给出一条 Toast 消息"抱歉,目前没有可用的链接">
也许你需要这样做:
fb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//data6 may be having link to fb ,here we check if it is not null
if(data6!=null )
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(data6));
startActivity(intent);
}else{
//toast a message
Toast.makeText(Yourclass.this, "Sorry there's no link available at this moment", Toast.LENGTH_SHORT).show();
}
});