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一切正常,没有错误,但在xml中,tvfinalgrade保留0.0 ...为什么不显示双翅片?我很确定应该写什么样的tvfin代码行,但我认为它不对。我的代码没有正确更改TextView
public class GFActivity extends Activity {
public double fin;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.getfinal);
double q1, q2, ex;
EditText etq1, etq2, eteg;
etq1 = (EditText)findViewById(R.id.editText1);
try{
q1 = Double.parseDouble(etq1.getText().toString());
} catch (NumberFormatException e) {
q1=0;
}
etq2 = (EditText)findViewById(R.id.editText2);
try{
q2 = Double.parseDouble(etq2.getText().toString());
} catch (NumberFormatException e){
q2 = 0;
}
eteg = (EditText)findViewById(R.id.editText3);
try{
ex = Double.parseDouble(eteg.getText().toString());
} catch (NumberFormatException e){
ex = 0;
}
fin = 0.4*q1+0.4*q2+0.2*ex;
if(fin == (int)fin){
System.out.println((int)fin);
}
else{
fin = 0.01*((int)(fin*100));
System.out.println(fin);
}
Button solve = (Button)findViewById(R.id.getfinbutton);
solve.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
TextView tvfin= TextView)findViewById(R.id.tvfinalgrade);
tvfin.setText(fin+"");
}
});
}
}
太棒了,工作!只是另一件事...而不是显示94.6,它显示94.6000001。我怎样才能解决这个问题? – Wilson 2012-04-01 16:06:39
@JesusSqueegee试试这个:'tvfin.setText(String.format(“%.2f”,fin));'' – Luksprog 2012-04-01 16:14:33