このようなコードを書いたのですがToastが表示されずに困っています。エラーなどは表示されていないのですがエミュレーターで強制終了してしまいます。
public class Input_a1 extends AppCompatActivity { public final static String EXTRA_KAI = "com.example.sample.name.KAI"; public final static String EXTRA_TOU = "com.example.sample.name.TOU"; public final static String EXTRA_KAN = "com.example.sample.name.KAN"; public final static String EXTRA_KAS = "com.example.sample.name.KAS"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(com.example.sample.name.R.layout.activity_input); } public void get_result (View view){ Resources resources = getResources(); String error = resources.getString(com.example.sample.name.R.string.error); EditText kai = (EditText) findViewById(com.example.sample.name.R.id.kai); String kai1 =kai.getText().toString().trim(); EditText tou = (EditText) findViewById(com.example.sample.name.R.id.tou); String tou1 = tou.getText().toString().trim(); EditText kan = (EditText) findViewById(com.example.sample.name.R.id.kan); String kan1 = kan.getText().toString().trim(); EditText kas = (EditText) findViewById(com.example.sample.name.R.id.kas); String kas1 = kas.getText().toString().trim(); if(kai1.equals("") == true){ Toast.makeText(this,error,Toast.LENGTH_LONG).show(); }else { } Intent intent = new Intent(this,com.example.sample.name.result.Result_a1.class); intent.putExtra(EXTRA_KAI, kai1); intent.putExtra(EXTRA_TOU, tou1); intent.putExtra(EXTRA_KAN, kan1); intent.putExtra(EXTRA_KAS, kas1); startActivity(intent); コード
08-15 23:21:51.368 28412-28412/com.example.sample.nameE/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.sample.name, PID: 28412
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sample.name/com.example.sample.name.result.Result_a1}: java.lang.NumberFormatException: Invalid double: ""
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2248)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5151)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NumberFormatException: Invalid double: ""
at java.lang.StringToReal.invalidReal(StringToReal.java:63)
at java.lang.StringToReal.parseDouble(StringToReal.java:248)
at java.lang.Double.parseDouble(Double.java:295)
at com.example.sample.name.result.Result_a1.onCreate(Result_a1.java:24)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2212)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5151)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
at dalvik.system.NativeStart.main(Native Method)
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