小编Dra*_*izu的帖子

我被困在访问安装页面,似乎无法让它工作,它总是给我一个500内部服务器错误错误.

我已经研究了一些类似的问题解决方案,但它们没有用.

我已经制作了这段代码:

public class MainActivity extends AppCompatActivity {

private ImageButton ourButton;
private EditText operand1;

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

    // Find Views by IDs :
    ourButton = (ImageButton) findViewById(R.id.gobutton);
    operand1 = (EditText) findViewById(R.id.edit_Name);

    String ed_text = operand1.getText().toString().trim();
    if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null)
    {
        ourButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "You did not enter a username", Toast.LENGTH_LONG).show();
            }
        });
    }
    else
    {
        ourButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View …