java - 新 Activity 未响应

我已经尝试了两天了，但我第二次活动只是在单击按钮时才开始，没有错误消息，没有空白页，好像按钮不起作用，我想念了吗？明显的东西？

public class createMessage extends AppCompatActivity {
    public static final String EXTRA_MESSAGE = "message";

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

    Button b ;

    public void clickSend(){
        b = (Button) findViewById(R.id.send);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(createMessage.this,receiveMessage.class);
                startActivity(intent);
                EditText editText = (EditText) findViewById(R.id.typeMessage);
                String message = editText.getText().toString();
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });
    }
}

第二项活动：

public class receiveMessage extends AppCompatActivity {

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


        // Get the Intent that started this activity and extract the string
        Intent intent = getIntent();
        String message = intent.getStringExtra(createMessage.EXTRA_MESSAGE);

        // Capture the layout's TextView and set the string as its text
        TextView textView = (TextView) findViewById(R.id.showMessage);
        textView.setText(message);
    }
}

最佳答案

您必须在clickSend()方法中调用onCreate()方法。

然后，只有onClickListener将起作用。

并删除两次调用startActivity(intent)的操作。

如下更改createMessage类的代码

public class createMessage extends AppCompatActivity {
    public static final String EXTRA_MESSAGE = "message";

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

    Button b ;

    public void clickSend(){
        b = (Button) findViewById(R.id.send);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(createMessage.this,receiveMessage.class);
                EditText editText = (EditText) findViewById(R.id.typeMessage);
                String message = editText.getText().toString();
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });
     }
    }

关于java - 新 Activity 未响应，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45295357/