Android “查看”按钮会使应用程序崩溃

当我点击review按钮时，我的应用程序崩溃了

My `MainActivity` code:

    package com.example.android.myproject3;

    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.View;
    import android.widget.CheckBox;
    import android.widget.EditText;
    import android.widget.RadioButton;
    import android.widget.RadioGroup;
    import android.widget.TextView;
    import android.widget.Toast;

    import static com.example.android.myproject3.R.id.ans1;
    import static com.example.android.myproject3.R.id.uid;

    public class MainActivity extends AppCompatActivity {

        String answ;

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

        public void onRadioButtonClicked(View view) {
            // Is the button now checked?
            boolean checked = ((Button) view).isPressed();

            // Check which radio button was clicked
            switch (view.getId()) {
                case R.id.radio3a:
                    if (checked)

                        break;
                case R.id.radio3b:
                    if (checked)
                        // Ninjas rule
                        break;
            }
        }

        public void onRadioButtonClicked1(View view) {
            // Is the button now checked?
            boolean checked1 = ((Button) view).isPressed();

            // Check which radio button was clicked
            switch (view.getId()) {
                case R.id.radio6a:

                    if (checked1)

                        break;
                case R.id.radio6b:
                    if (checked1)

                        break;
            }
        }

        public void onRadioButtonClicked2(View view) {
            // Is the button now checked?
            boolean checked2 = ((Button) view).isPressed();

            // Check which radio button was clicked
            switch (view.getId()) {
                case R.id.radio8a:

                    if (checked2)

                        break;
                case R.id.radio8b:
                    if (checked2)

                        break;
            }
        }

        public String createanswers(String name, String uid, String ans1, boolean checkbox2a, boolean checkbox2b, boolean checkbox2c, boolean checkbox2d, boolean checked, boolean checkbox4a, boolean checkbox4b, boolean checkbox4c, boolean checkbox4d, String ans5, boolean checked1, String ans7, boolean checked2) {
            String answers = "Name: " + name + "\nuid: " + uid + "\nAns 1: " + ans1 + "\nAns 2:" + (checkbox2a) + "\nAns 2:" + (checkbox2b) +"\nAns 2:" + (checkbox2c) +"\nAns 2:" + (checkbox2d) +"\nAns 3: " + checked + "\nAns 4:" + (checkbox4a) + "\nAns 4:" + (checkbox4b) +"\nAns 4:" + (checkbox4c) +"\nAns 4:" + (checkbox4d) + "\nAns 5: " + ans5 + "\nAns 6: " + checked1 + "\nAns 7: " + ans7 + "\nAns 8: " + checked2;
            return answers;
        }

        public void review(View view) {


            EditText editText = (EditText) findViewById(R.id.name);
            String name = editText.getText().toString();
            Log.v("MainActivity", "Name: " + name);
            EditText editText1 = (EditText) findViewById(uid);
            String uid = editText.getText().toString();
            Log.v("MainActivity", "uid: " + uid);
            EditText editText3 = (EditText) findViewById(ans1);
            String ans1 = editText.getText().toString();
            Log.v("MainActivity", "Ans 1: " + ans1);
            CheckBox checkBox2a = (CheckBox) findViewById(R.id.a);
            boolean checkbox2a = checkBox2a.isChecked();
            Log.v("MainActivity", "Ans 2:" + checkBox2a);
            CheckBox checkBox2b = (CheckBox) findViewById(R.id.b2);
            boolean checkbox2b = checkBox2b.isChecked();
            Log.v("MainActivity", "Ans 2:" + checkBox2b);
            CheckBox checkBox2c = (CheckBox) findViewById(R.id.c2);
            boolean checkbox2c = checkBox2c.isChecked();
            Log.v("MainActivity", "Ans 2:" + checkbox2c);
            CheckBox checkBox2d = (CheckBox) findViewById(R.id.d2);
            boolean checkbox2d = checkBox2d.isChecked();
            Log.v("MainActivity", "Ans 2:" + checkbox2d);
            RadioGroup rg = (RadioGroup) findViewById(R.id.rg1);
            boolean checked = ((RadioButton) view).isChecked();
            CheckBox checkBox4a = (CheckBox) findViewById(R.id.a4);
            boolean checkbox4a = checkBox4a.isChecked();
            Log.v("MainActivity", "Ans 4:" + checkbox4a);
            CheckBox checkBox4b = (CheckBox) findViewById(R.id.b4);
            boolean checkbox4b = checkBox4b.isChecked();
            Log.v("MainActivity", "Ans 4:" + checkbox4b);
            CheckBox checkBox4c = (CheckBox) findViewById(R.id.c4);
            boolean checkbox4c = checkBox4c.isChecked();
            Log.v("MainActivity", "Ans 4:" + checkbox4c);
            CheckBox checkBox4d = (CheckBox) findViewById(R.id.d4);
            boolean checkbox4d = checkBox4d.isChecked();
            Log.v("MainActivity", "Ans 4:" + checkbox4d);
            EditText editText5 = (EditText) findViewById(R.id.ans5);
            String ans5 = editText5.getText().toString();
            Log.v("MainActivity", "Ans 5: " + ans5);
            RadioGroup rg2 = (RadioGroup) findViewById(R.id.rg2);
            boolean checked1 = ((RadioButton) view).isChecked();
            EditText editText7 = (EditText) findViewById(R.id.ans7);
            String ans7 = editText7.getText().toString();
            Log.v("MainActivity", "Ans 7: " + ans7);

            RadioGroup rg3 = (RadioGroup) findViewById(R.id.rg3);
            boolean checked2 = ((RadioButton) view).isChecked();


            answ = createanswers(name, uid, ans1, checkbox2a, checkbox2b, checkbox2c, checkbox2d, checked, checkbox4a, checkbox4b, checkbox4c, checkbox4d, ans5, checked1, ans7, checked2);
            displayMessage(answ);
        }

        public void submit(View view){
            Intent i = new Intent(Intent.ACTION_SEND);

            i.setType("message/rfc822");
            i.putExtra(Intent.EXTRA_TEXT, answ);
            try {
                startActivity(Intent.createChooser(i, "Send mail..."));
            } catch (android.content.ActivityNotFoundException ex) {
                Toast.makeText(MainActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
            }

        }

        private void displayMessage(String message) {
            TextView quantity = (TextView) findViewById(
                    R.id.review1);
            quantity.setText(message);
        }

    }

“查看”按钮没有按计划显示。除了“查看”按钮外，其他所有功能都正常工作 当我点击review按钮时，应用程序停止工作。我尝试了我所知道的一切，但都失败了。

您将view设置为单选按钮，但实际上它是一个按钮

所以试试看

boolean checked = ((RadioButton) view).isChecked();

---

尽管考虑到您只是按下了按钮，这并没有真正意义，但这就是导致崩溃的原因。

对于崩溃和错误，请找到并发布stacktrace。查看此SO回复以了解更多信息如果应用程序崩溃，请将logcat添加到您的问题logcat已添加。感谢您的回复，但应用程序仍然结束。“查看”按钮不起作用，其他所有按钮都起作用

boolean checked = ((RadioButton) view).isChecked();

boolean checked = ((Button) view).isPressed();