Switch like google translate

Question

How can I implement the switch in Google translator or in the screenshot below?

I did it, but the texts are switched from the second click on the button.

public class MainActivity extends AppCompatActivity { private int sw; TextView txtLeft; TextView txtRight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txtLeft = findViewById(R.id.txtLeft); txtRight = findViewById(R.id.txtRight); ImageButton btnRef = findViewById(R.id.btnRef); sw = 0; txtLeft.setText("Русский"); txtRight.setText("Английский"); btnRef.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { switch (sw){ case 0: txtLeft.setText("Русский"); txtRight.setText("Английский"); sw = 1; break; case 1: txtLeft.setText("Английский"); txtRight.setText("Русский"); sw = 0; break; } } }); } }

To change the text between the buttons, or to put the same button, or so that when pressed it turns over?
I want the texts to be switched by clicking on the button and depending on how they are switched to do actions.
For example, if Russian is on the left, and English on the right is one action;
Put sw = 1. I myself do not like such tasks, they are almost impossible to make neat and elegant.

Accepted Answer · 2019-05-14T07:37:15

Shorter solution:

 public class MainActivity extends AppCompatActivity { private boolean isENGRight; TextView txtLeft; TextView txtRight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txtLeft = findViewById(R.id.txtLeft); txtRight = findViewById(R.id.txtRight); ImageButton btnRef = findViewById(R.id.btnRef); txtLeft.setText("Русский"); txtRight.setText("Английский"); btnRef.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { txtRight.setText(isENGRight? "Английский":"Русский"); txtLeft.setText(isENGRight? "Русский":"Английский"); isENGRight = !isENGRight; } }); } }

Actions can be performed as isENGRight :

 if (isENGRight) { //перевод с русского на английский } else { // перевод с английского на русский }

Switch like google translate

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