java - 安卓 fragment

Question

我有一个问题，我的 Activity 上有三个按钮，当单击一个按钮时，我想打开一个特定的 fragment 。我该怎么做？这是我的代码

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1 = (Button) findViewById(R.id.button1);
        bt2 = (Button) findViewById(R.id.button2);
        bt3 = (Button) findViewById(R.id.button3);

        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
                android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                if (bt1.isClickable()){
                    Fragment_one f1 = new Fragment_one();
                    fragmentTransaction.add(R.id.fragment_container, f1);
                    fragmentTransaction.addToBackStack(null);
                    fragmentTransaction.commit();
                }
            }
        });

Answer 1

尝试这样做:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    bt1 = (Button) findViewById(R.id.button1);
    bt2 = (Button) findViewById(R.id.button2);
    bt3 = (Button) findViewById(R.id.button3);

    bt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // use either changeFragment() or replaceFragment methods to switch between your fragments
            Fragment_one f1 = new Fragment_one();
            changeFragment(f1);
            // replaceFragment(f1);
        }
    });

// this method will add a fragment if it not exist or show it if exists
public void changeFragment(Fragment fragment) {
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction transaction = fragmentManager.beginTransaction();

    String tag = fragment.getClass().getName();
    // Check if fragment was added already
    boolean alreadyAdded = fragmentManager.findFragmentByTag(tag) != null;

    // hide all added fragments
    List<Fragment> fragments = fragmentManager.getFragments();
    if (fragments != null) {
        for (Fragment f : fragments) {
            transaction.hide(f);
        }
    }

    // if the given fragment is added already just show it
    // if not then add it
    if (alreadyAdded) {
        transaction.show(fragment);
    } else {
        transaction.add(R.id.fragment_container, fragment, tag);
        // add to back stack will store just added fragments
        transaction.addToBackStack(tag);
    }
    transaction.commit();
}

// this method will replace current fragment with the given one
public void replaceFragment(Fragment fragment) {
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction transaction = fragmentManager.beginTransaction();
    String tag = fragment.getClass().getName();
    transaction.replace(R.id.fragment_container, fragment, tag);
    transaction.addToBackStack(tag);
    transaction.commit();
}

您不需要在 onClick() 中检查按钮是否可点击，因为如果不可点击，则根本不会调用 onClick()