Textview when clicking , increase certain value that is in Edit text

Question

I’m making a test application that has 1 Edit and a textview , Edit text will have a value within the initial 0 , when you click the textview , I want it to increase to 10.00 , and if you click again increase to 20 , and so on

        teste = findViewById(R.id.add10);
        teste2 = findViewById(R.id.editText);

        teste.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int a=Integer.parseInt(teste2.getText().toString());
                int b=a+10;
                teste2.setText(new Integer(b).toString());
            }
        });
    }
}

Segue logcat

01-22 10:23:48.987 8645-8645/com.example.gabriel.teste E/BoostFramework: BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /vendor/lib]]
01-22 10:23:49.100 8645-8645/com.example.gabriel.teste E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.gabriel.teste, PID: 8645
 java.lang.NumberFormatException: For input string: "Name"
     at java.lang.Integer.parseInt(Integer.java:521)
     at java.lang.Integer.parseInt(Integer.java:556)
     at com.example.gabriel.teste.MainActivity$1.onClick(MainActivity.java:25)
     at android.view.View.performClick(View.java:6261)
     at android.widget.TextView.performClick(TextView.java:11159)
     at android.view.View$PerformClick.run(View.java:23748)
     at android.os.Handler.handleCallback(Handler.java:751)
     at android.os.Handler.dispatchMessage(Handler.java:95)
     at android.os.Looper.loop(Looper.java:154)
     at android.app.ActivityThread.main(ActivityThread.java:6776)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

Answer 1

Friend, First of all set in your textview that it should accept only numbers:

android:inputType="number"

Then, just put a setOnClickListener to increase the value:

tvAdd10 = (TextView) findViewById(R.id.add10);
tvValorAtual = (EditText) findViewById(R.id.editText);

tvAdd10.setOnClickListener(new View.OnClickListener(){
  @Override
  public void onClick(View view){
    int valorAtual = Integer.parseInt(tvValorAtual.getText().toString());
    int novoValor = valorAtual + 10;
    tvValorAtual.setText(String.valueOf(novoValor));
  }
});

Answer 2

    teste = findViewById(R.id.add10);
        teste2 = findViewById(R.id.editText);

        teste.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int a=Integer.parseInt(teste2.getText().toString());
                int b=a+10;
                teste2.setText(String.valueOf(b));
            }
        });

Answer 3

This error happens when you pass some "null" value or parse cannot convert. It seems to me that you have some string "Name" in your app and he is trying to convert to Integer.

A good practice when casting is always to check if the value can return null or in some format that the type cannot convert.