Android Studio跳转页面按钮无效问题求助

Hey there! Let's get that Proceed button working for you. I spotted the main issue right away in your MainActivity code, plus a couple of other checks to make sure everything runs smoothly.

The Root Cause: Empty Custom Method #

In your button click listener, you're calling a custom startActivityFromFragment() method—but this method is completely empty! It doesn't execute any logic to launch your FirstQuiz activity. That's exactly why clicking the button does nothing at all.

Fix 1: Use the Correct Activity Launch Method #

Replace your empty custom method with Android's built-in startActivity() to properly launch FirstQuiz. Here's the corrected MainActivity code:

package com.example.john.quiz1; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 

public class MainActivity extends AppCompatActivity { 
    Button btn; 

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

        btn = (Button) findViewById(R.id.button); 
        btn.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                // Use Android's built-in method to launch the activity
                startActivity(new Intent(MainActivity.this, FirstQuiz.class)); 
            } 
        }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.menu_main, menu); 
        return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
        int id = item.getItemId(); 
        if (id == R.id.action_settings) { 
            return true; 
        } 
        return super.onOptionsItemSelected(item); 
    } 
}

Fix 2: Verify FirstQuiz is Registered in AndroidManifest.xml #

Even with the corrected launch code, your app might fail silently if FirstQuiz isn't registered in your manifest. Make sure you add this entry inside the <application> tag of your AndroidManifest.xml:

<activity android:name=".FirstQuiz" />

Extra Tip: Improve Layout Switching in FirstQuiz #

While not related to your current button issue, I noticed you're using setContentView() multiple times to switch layouts in FirstQuiz. This can cause memory leaks and lose UI state. For a better approach, consider using a ViewSwitcher, FrameLayout with fragments, or toggling view visibility instead. But that's a polish step you can tackle later!

Give these fixes a try, and your Proceed button should launch FirstQuiz without any problems.

内容的提问来源于stack exchange，提问作者JHUB