Android中Activity传递参数至Fragment中

这里写链接内容 Fragment现在在项目中已经很常见了，一般都是Activity管理Fragment或者Activity中嵌套Fragment使用，常见的ViewPager左右滑动。我在项目中遇到一个问题就是有一个Activity页面，但Activity页面中有4个Fragment页面需要展示，4个Fragment页面是同个接口，但是不同的参数，4个Fragment可以切换，开始不会做，纠结了半天，做出来了，哈哈，记录一下，

效果图：



其实也很简单，就是一个Activity页面里面放了4个按钮，分别显示4个Fragment页面，上代码：

MainActivity

public class MainActivity extends FragmentActivity implements OnClickListener {
private Button btn1, btn2, btn3, btn4;

private FragmentManager manager; // manager
private FragmentTransaction transaction; // 事物

/**
* fragment
*/
private Fragment1 fragment1;
private Fragment2 fragment2;
private Fragment3 fragment3;
private Fragment4 fragment4;

//参数
String userIds ;
String userNames;
Bundle bundle;

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

findViews();
/**
* 参数赋值
*/
userIds = "abc123";
userNames = "admin";
manager = getSupportFragmentManager();
setTabSelection(0); // 设置第一个

}

private void findViews() {
// TODO Auto-generated method stub
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);

btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn1:
setTabSelection(0);
break;
case R.id.btn2:
setTabSelection(1);
break;

case R.id.btn3:
setTabSelection(2);
break;
case R.id.btn4:
setTabSelection(3);
break;
}
}

private void setTabSelection(int index) {
// TODO Auto-generated method stub
// 开启一个事物
transaction = manager.beginTransaction();
// 隐藏掉所有的Fragment
hideFragment(transaction);
switch (index) {
case 0:
if (fragment1 == null) {
/**
* 通过Bundle传递参数
*/
bundle = new Bundle();
bundle.putString("userIds", userIds);
bundle.putString("userNames", userNames);
fragment1 = new Fragment1();
fragment1.setArguments(bundle);
transaction.add(R.id.content, fragment1, "TAG");
} else {
transaction.show(fragment1);
}

break;
case 1:
if (fragment2 == null) {
bundle = new Bundle();
bundle.putString("userIds", userIds);
bundle.putString("userNames", "123");
fragment2 = new Fragment2();
fragment2.setArguments(bundle);
transaction.add(R.id.content, fragment2, "TAG");
} else {
transaction.show(fragment2);
}

break;

case 2:
if (fragment3 == null) {
bundle = new Bundle();
bundle.putString("userIds", "123");
bundle.putString("userNames", "admin");
fragment3 = new Fragment3();
fragment3.setArguments(bundle);
transaction.add(R.id.content, fragment3, "TAG");
} else {
transaction.show(fragment3);
}
break;
case 3:
default:
if (fragment4 == null) {
bundle = new Bundle();
bundle.putString("userIds", "userid");
bundle.putString("userNames", "123");
fragment4 = new Fragment4();
fragment4.setArguments(bundle);
transaction.add(R.id.content, fragment4, "TAG");
} else {
transaction.show(fragment4);
}
break;
}
transaction.commit(); // 提交

}

private void hideFragment(FragmentTransaction transaction) {
// TODO Auto-generated method stub
if (fragment1 != null) {
transaction.hide(fragment1);
}
if (fragment2 != null) {
transaction.hide(fragment2);
}
if (fragment3 != null) {
transaction.hide(fragment3);
}
if (fragment4 != null) {
transaction.hide(fragment4);
}
}

}

代码就是这样，通过Bundle传递，bundle.put(“key”,”value”);设置参数，最后目标fragment.setArguments(bundle);设置进去

fragment4 = new Fragment4();
bundle = new Bundle();
bundle.putString("userIds", "userid");
bundle.putString("userNames", "123");
fragment4.setArguments(bundle);
transaction.add(R.id.content, fragment4, "TAG");

可以看这一块，最后transaction.add(R.id.content, fragment4, “TAG”);

这里给设置了一个TAG，后面接收的时候用。Activity里面的代码就是这样，下面就是Fragment接收参数了

Fragment代码：

public class Fragment1 extends Fragment {

private MainActivity mMainActivity;
View fragment1_layout;
private TextView tv1;

@Override
@Nullable
public View onCreateView(LayoutInflater inflater,
ViewGroup container,Bundle savedInstanceState) {
// TODO Auto-generated method stub
fragment1_layout =   inflater.inflate(R.layout.fragment1, null);
mMainActivity = (MainActivity) getActivity();

String userId = getFragmentManager().findFragmentByTag("TAG").getArguments().getString("userIds").trim();
String userName = getFragmentManager().findFragmentByTag("TAG").getArguments().getString("userNames").trim();

tv1 = (TextView) fragment1_layout.findViewById(R.id.tv1);
tv1.setText("userId:"+userId + "\n"+"\n"+"userName:"+userName);

return fragment1_layout;
}

}

fragment接收参数getFragmentManager().findFragmentByTag(“TAG”).getArguments().getString(“userIds”)；获取参数，后面的就不介绍了，根据自己的需求。Fragment中的布局也比较简单，就一个用于显示的TextView。

哈哈，文笔太菜，有错误之处，敬请指教。

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