// 定义Fragment 理解为 是Activity的一部分
public class Fragment1 extends Fragment {
// 当系统第一次画UI的时候调用 通过这个方法可以让Fragment显示自己的布局内容
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// 通过打气筒 把一个布局转换成一个View对象
View view = inflater.inflate(R.layout.fragment_fragment1, null);
//1 找到按钮 设置点击事件
Button btn_update = (Button) view.findViewById(R.id.btn_update);
btn_update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//2 修改fragment2里面的内容，通过fragment的公共桥梁--->Activity
Fragment2 fragment2 = (Fragment2) getActivity().getSupportFragmentManager().findFragmentByTag("f2");
fragment2.updateText("haha");
}
});
return view;
}
}
public class Fragment2 extends Fragment {
private TextView tv_content;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_fragment2, null);
//1 找到tv
tv_content = (TextView) view.findViewById(R.id.tv_content);
return view;
}
// 修改TextView 的内容
public void updateText(String content) {
tv_content.setText(content);
}
}
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//1 获取fragment管理者
FragmentManager fragmentManager = getSupportFragmentManager();
//2 开启一个事务
FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
//2.1 替换fragment
beginTransaction.replace(R.id.ll_1, new Fragment1(), "f1");
beginTransaction.replace(R.id.ll_2, new Fragment2(), "f2");
//3 开启事务
beginTransaction.commit();
}
}
