Fragment的setArguments传值

activity布局

xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.sys.testfragment.MainActivity">

            android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:id="@+id/llMain"/>

fragment布局

xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

            android:id="@+id/btnF"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

activity代码

import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TestFragment testFragment = new TestFragment();
        Bundle bundle = new Bundle();
        bundle.putString("aa", "5");
        testFragment.setArguments(bundle);
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.llMain, testFragment);
        transaction.commit();
    }
}

fragment代码

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

/**
 * Created by sys on 2017/2/7.
 */

public class TestFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_tet,null);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Button button = (Button) view.findViewById(R.id.btnF);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Bundle args = getArguments();
                String a = args.getString("aa");
                Toast.makeText(getActivity(), "命令是"+String.valueOf(a), Toast.LENGTH_SHORT).show();
            }
        });
    }

}