Android fragments Android错误膨胀类片段，那么如何使用带有selectedFragment的映射？

这是我的代码片段。我只想在我选择附近的点击片段时在活动中显示地图

public class MainActivity extends FragmentActivity {
Map m = new Map();

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

    android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
    android.support.v4.app.FragmentTransaction transaction = fm
            .beginTransaction();
    Fragment startFragment = new ViewAll();

    transaction.add(R.id.fragment_placeholder, startFragment);
    transaction.commit();

}

public void onSelectFragment(View view) {

    Fragment newFragment;

    if (view == findViewById(R.id.btnNearMe)) {
        newFragment = new NearMe();
    } else if (view == findViewById(R.id.btnCategory)) {
        newFragment = new Category();
    } else if (view == findViewById(R.id.btnViewAll)) {
        newFragment = new ViewAll();
    } else if (view == findViewById(R.id.btnSignIn)) {
        newFragment = new SignUpIn();
    } else {
        newFragment = new ViewAll();
    }

    android.support.v4.app.FragmentTransaction transaction = getSupportFragmentManager()
            .beginTransaction();
    transaction.replace(R.id.fragment_placeholder, newFragment);
    transaction.addToBackStack(null);
    transaction.commit();

}

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显示您的代码片段codepost stacktrace为什么删除它并发布导致异常的行