Two methods to determine whether the input box is empty in Android

　

Determine whether the input box EditText is empty in Android

 

Method 1: Judging by the method TextUtils.isEmpty(s), the parameter s is the content of the input box obtained

Method 2: Through the method str.equals(""), str is the content of the obtained input box

 

 

Simply test these two methods with the following piece of code

 

public class MainActivity extends AppCompatActivity {

    EditText edit;
    Button btn1,btn2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.activity_main);

        edit = (EditText) findViewById(R.id.edit);

        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);



        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String s = edit.getText().toString().trim();
                if(TextUtils.isEmpty(s)){
                    Toast.makeText(getApplicationContext(),
                            " Method 1: The input box is empty " ,Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(getApplicationContext(),
                            "The input box is not empty " ,Toast.LENGTH_LONG).show();
                }
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String s = edit.getText().toString().trim();
                if(s.equals("")){
                    Toast.makeText(getApplicationContext(),
                            " Method 2: The input box is empty " ,Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(getApplicationContext(),
                            "The input box is not empty " ,Toast.LENGTH_LONG).show();
                }
            }
        });


    }
}

 

Effect picture: