Android Studio - 無法解析方法 'setText(double)'

Question

我已经初始化了一个双变量，并希望在TextView中显示它
变量名用红色下划线。
我试图将其解析为字符串，但没有成功

public class MainActivity extends AppCompatActivity {
Location currentloc = new Location("currentloc");
double currlat = 0.0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView gpsbox = (TextView) findViewById(R.id.gpsView);
try {
currlat = currentloc.getLatitude();
} catch(Exception e) {
Toast.makeText(this, "Hello, an exception was just thrown but I catched it. " + e.toString(), Toast.LENGTH_SHORT).show();
}
gpsbox.setText(currlat);
setContentView(R.layout.activity_main);
}
}

Answer 1

您必须通过将其分配给String

String.valueOf(currlat);

我希望它对你有用。

Answer 2

尝试这个

setContentView(R.layout.activity_main);
TextView gpsbox = (TextView) findViewById(R.id.gpsView);
try {
currlat = currentloc.getLatitude();
} catch(Exception e) {
Toast.makeText(this, "Hello, an exception was just thrown 
but I catched it. " + e.toString(), Toast.LENGTH_SHORT).show();
}
gpsbox.setText(String.valueOf(currlat));

Answer 3

代码中有两个错误。

1. Set content视图在findViewById之后使用，这将引发异常

2. double应该用String.valueOf((方法包装以转换为字符串。

   公共类MainActivity扩展了AppCompatActivity｛

   Location currentloc = new Location("currentloc");
   double currlat = 0.0;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   TextView gpsbox = (TextView) findViewById(R.id.gpsView);
   try {
   currlat = currentloc.getLatitude();
   } catch (Exception e) {
   Toast.makeText(this, "Hello, an exception was just thrown but I catched it. " + e.toString(), Toast.LENGTH_SHORT).show();
   }
   gpsbox.setText(String.valueOf(currlat));
   }
   

   }