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public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TextView text1;
private FragmentManager manager;
private Fragment1 fragment1;
private Fragment2 fragment2;
private Fragment3 fragment3;
private RadioButton button1;
private RadioButton button2;
private RadioButton button3;
private RadioGroup group1;
private FrameLayout fragme1;

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

private void initData() {

    fragment1 = new Fragment1();

    fragment2 = new Fragment2();

    fragment3 = new Fragment3();

    manager = getSupportFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();
    transaction.replace(R.id.fragme1, fragment1).commit();
}

private void initView() {
    text1 = (TextView) findViewById(R.id.text1);
    button1 = (RadioButton) findViewById(R.id.button1);
    button1.setOnClickListener(this);
    button2 = (RadioButton) findViewById(R.id.button2);
    button2.setOnClickListener(this);
    button3 = (RadioButton) findViewById(R.id.button3);
    button3.setOnClickListener(this);
    group1 = (RadioGroup) findViewById(R.id.group1);
    fragme1 = (FrameLayout) findViewById(R.id.fragme1);
}

@Override
public void onClick(View v) {
    FragmentTransaction transaction = manager.beginTransaction();
    switch (v.getId()) {
        case R.id.button1:
            text1.setText(button1.getText());
            transaction.replace(R.id.fragme1, fragment1);
            break;
        case R.id.button2:
            text1.setText(button2.getText());
            transaction.replace(R.id.fragme1, fragment2);
            break;
        case R.id.button3:
            text1.setText(button3.getText());
            transaction.replace(R.id.fragme1, fragment3);
            break;
    }
    transaction.commit();
}