Question

我的应用程序有两个按钮，在第一个按钮工作时执行各种任务（id：“CalcBtn”）但是，我想打开浏览器的第二个按钮（id：web）不起作用。当我打开模拟器时，第二个按钮的点击器不会启动网站甚至检测到点击本身。

public class MainActivity extends AppCompatActivity {

EditText editText;
EditText editText2;
EditText editText3;

Button CalcBtn;
Button web;

TextView Output;

double a, b, c, d, x1, x2;

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

    editText = (EditText) findViewById(R.id.editText);
    editText2 = (EditText) findViewById(R.id.editText2);
    editText3 = (EditText) findViewById(R.id.editText3);

    CalcBtn = (Button) findViewById(R.id.CalcBtn);
    web = (Button) findViewById(R.id.web);

    Output = (TextView) findViewById(R.id.Output);

    CalcBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!editText.getText().toString().equals("") && !editText2.getText().toString().equals("")
                    && !editText3.getText().toString().equals("")) {

                a = Double.parseDouble(editText.getText().toString());
                b = Double.parseDouble(editText2.getText().toString());
                c = Double.parseDouble(editText3.getText().toString());

                d = Math.pow(b, 2) - 4*a*c;

                if (d == 0) {
                    x1 = -b / (2*a);
                    Output.setText("d = " + d + "\nx = " + x1);
                } else if (d < 0) {
                    Output.setText("No Real Roots");
                } else if (d > 0) {
                    x1 = (-b + Math.sqrt(d))/(2*a);
                    x2 = (-b - Math.sqrt(d))/(2*a);
                    Output.setText("d = " + d + "\nx = " + x1 + "\nx2 = " + x2);

                    web.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            Intent web = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.purplemath.com/modules/quadform.htm"));
                            startActivity(web);
                        }
                    });

                }
            }
        }
    });
  }
}

Answer 1

将您的web按钮点击事件置于点击事件CalcBtn之外。 web按钮点击监听器位于CalcBtn点击事件内，甚至无法检测到。

网页按钮点击事件

 web.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                Intent web = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.purplemath.com/modules/quadform.htm"));
                                startActivity(web);
                            }
                        });

CalcBtn按钮点击事件

 CalcBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(!editText.getText().toString().equals("") && !editText2.getText().toString().equals("")
                    && !editText3.getText().toString().equals("")) {

                a = Double.parseDouble(editText.getText().toString());
                b = Double.parseDouble(editText2.getText().toString());
                c = Double.parseDouble(editText3.getText().toString());

                d = Math.pow(b, 2) - 4*a*c;

                if (d == 0) {
                    x1 = -b / (2*a);
                    Output.setText("d = " + d + "\nx = " + x1);
                } else if (d < 0) {
                    Output.setText("No Real Roots");
                } else if (d > 0) {
                    x1 = (-b + Math.sqrt(d))/(2*a);
                    x2 = (-b - Math.sqrt(d))/(2*a);
                    Output.setText("d = " + d + "\nx = " + x1 + "\nx2 = " + x2);



                }
            }
        }
    });

Android Studio- OnClickListener未检测到Click

1 个答案: