java - 我的应用程序崩溃了,我不知道为什么
问题描述
所以我正在尝试制作一个单位转换应用程序,在我成功将所有单位转换为用户输入的单位后,我尝试重复该过程,但我的应用程序崩溃了。谁能向我解释我错在哪里?
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this);
mAdview = (AdView)findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().addTestDevice(AdRequest.DEVICE_ID_EMULATOR).build();
mAdview.loadAd(adRequest);
AdView adView = new AdView(this);
adView.setAdSize(AdSize.BANNER);
adView.setAdUnitId("ca-app-pub-3940256099942544/6300978111");
km = findViewById(R.id.unit_km);
mi = findViewById(R.id.unit_mile);
m = findViewById(R.id.unit_meters);
ft = findViewById(R.id.unit_feet);
yd = findViewById(R.id.unit_yard);
cm = findViewById(R.id.unit_centimetri);
in = findViewById(R.id.unit_inch);
conv = findViewById(R.id.convert);
clear = findViewById(R.id.clear);
conv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try{
double value_km = Double.valueOf(km.getText().toString());
km.setText(Double.valueOf(value_km).toString()+ " Kilometers");
mi.setText(Double.valueOf(UnitConverter.kilometri2Mile(value_km)).toString()+" Mile");
m.setText(Double.valueOf(UnitConverter.kilometri2Metri(value_km)).toString()+" Metri");
ft.setText(Double.valueOf(UnitConverter.kilometri2Feet(value_km)).toString()+" Feet");
yd.setText(Double.valueOf(UnitConverter.kilometri2Yard(value_km)).toString()+" Yarzi");
cm.setText(Double.valueOf(UnitConverter.kilometri2Centimetri(value_km)).toString()+" Centimetri");
in.setText(Double.valueOf(UnitConverter.kilometri2Inch(value_km)).toString()+" Inch");
double value_mi = Double.valueOf(mi.getText().toString());
km.setText(Double.valueOf(UnitConverter.mile2Kilometri(value_mi)).toString()+ " Kilometers");
mi.setText(Double.valueOf(value_mi).toString()+" Mile");
m.setText(Double.valueOf(UnitConverter.mile2Metri(value_mi)).toString()+" Metri");
ft.setText(Double.valueOf(UnitConverter.mile2Feet(value_mi)).toString()+" Feet");
yd.setText(Double.valueOf(UnitConverter.mile2Yarzi(value_mi)).toString()+" Yarzi");
cm.setText(Double.valueOf(UnitConverter.mile2Centimetri(value_mi)).toString()+" Centimetri");
in.setText(Double.valueOf(UnitConverter.mile2Inch(value_mi)).toString()+" Inch");
}catch (Exception e){
}
}
});
解决方案
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