android 底部通知,Android Fragment实现底部通知栏

蔚落 2022-10-17 11:23 183阅读 0赞

Android Fragment实现底部通知栏，供大家参考，具体内容如下

截图如下：

![4154b10077321a8ee5bc2765b0c28970.png][]

1. 第一步先要创建fragment(动态注册)

![8f1899208b8232419fda252a1716ddab.png][]

然后将两个勾选取消掉(还有一种是自己手动创建)

会自动生成相对应的layout布局，剩下的要根据自己的需求了

2.在Activity的布局里写好四个按钮

这里不是重点…

android:layout\_width="match\_parent"

android:layout\_height="match\_parent"

android:id="@+id/ll\_content\_part"

android:layout\_width="match\_parent"

android:layout\_height="match\_parent"

android:id="@+id/ll\_function"

android:layout\_alignParentBottom="true"

android:orientation="horizontal"

android:layout\_width="match\_parent"

android:layout\_height="wrap\_content">

android:id="@+id/btn\_msg\_list"

android:layout\_width="0dp"

android:layout\_height="wrap\_content"

android:layout\_weight="1"

android:textSize="13dp"

android:onClick="click"

android:text="msg"/>

android:id="@+id/btn\_contact"

android:layout\_width="0dp"

android:layout\_height="wrap\_content"

android:layout\_weight="1"

android:textSize="13dp"

android:onClick="click"

android:text="contact"/>

android:id="@+id/btn\_disc"

android:layout\_width="0dp"

android:layout\_height="wrap\_content"

android:layout\_weight="1"

android:textSize="13dp"

android:onClick="click"

android:text="disc"/>

android:id="@+id/btn\_me"

android:layout\_width="0dp"

android:layout\_height="wrap\_content"

android:layout\_weight="1"

android:textSize="13dp"

android:onClick="click"

android:text="me"/>

3.Activity的代码

其中定义了四个整型常量记录了四个按钮的状态，还有一个当前状态，进而判断当前点击按钮的状态，点击切换文字颜色和图标

每次判断四个Fragment的引用是否为空，不为空就不需要每次在new一遍Fragment

replace每次都会重新初始化fragment，它是先remove掉相同id的fragment，再add当前fragment。

add不会回每次都初始化fragment，一般配合hide()和show()方法

public class MainActivity extends AppCompatActivity \{

private Button btn\_contact;

private Button btn\_disc;

private Button btn\_me;

private Button btn\_msg\_list;

private FragmentManager fragmentManager;

private MsgListFragment msgListFragment;

private ContactFragment contactFragment;

private DiscoveryFragment discoveryFragment;

private MeFragment meFragment;

private final int STATE\_MSG =1;

private final int STATE\_CON =2;

private final int STATE\_DIS =3;

private final int STATE\_ME =4;

private int currentState;

@Override

protected void onCreate(Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity\_main);

initView();

initData();

chageButtonColor(currentState,STATE\_MSG);

private void initData() \{

fragmentManager = getFragmentManager();

switchFragment(this.STATE\_MSG);

private void initView() \{

btn\_contact = (Button) findViewById(R.id.btn\_contact);

btn\_disc = (Button) findViewById(R.id.btn\_disc);

btn\_me = (Button) findViewById(R.id.btn\_me);

btn\_msg\_list = (Button) findViewById(R.id.btn\_msg\_list);

public void click(View view) \{

switch (view.getId())\{

case R.id.btn\_msg\_list:

switchFragment(this.STATE\_MSG);

break;

case R.id.btn\_contact:

switchFragment(this.STATE\_CON);

break;

case R.id.btn\_disc:

switchFragment(this.STATE\_DIS);

break;

case R.id.btn\_me:

switchFragment(this.STATE\_ME);

break;

private void switchFragment(int toState) \{

if (toState == currentState)

return;

chageButtonColor(currentState,toState);

this.currentState=toState;

FragmentTransaction transaction = this.fragmentManager.beginTransaction();

Fragment fragment=msgListFragment;

switch (toState)\{

case STATE\_DIS:

if (discoveryFragment == null)

discoveryFragment= new DiscoveryFragment();

fragment= discoveryFragment;

break;

case STATE\_ME:

if (meFragment == null)

meFragment= new MeFragment();

fragment= meFragment;

break;

case STATE\_CON:

if (contactFragment == null)

contactFragment= new ContactFragment();

fragment= contactFragment;

break;

case STATE\_MSG:

if (msgListFragment == null)

msgListFragment= new MsgListFragment();

fragment= msgListFragment;

break;

transaction.replace(R.id.ll\_content\_part,fragment);

transaction.commit();

private void chageButtonColor(int currentState,int toState)\{

switch (currentState)\{

case STATE\_DIS:

this.btn\_disc.setTextColor(Color.BLACK);

break;

case STATE\_ME:

this.btn\_me.setTextColor(Color.BLACK);

break;

case STATE\_CON:

this.btn\_contact.setTextColor(Color.BLACK);

break;

case STATE\_MSG:

this.btn\_msg\_list.setTextColor(Color.BLACK);

break;

switch (toState)\{

case STATE\_DIS:

this.btn\_disc.setTextColor(Color.GREEN);

break;

case STATE\_ME:

this.btn\_me.setTextColor(Color.GREEN);

break;

case STATE\_CON:

this.btn\_contact.setTextColor(Color.GREEN);

break;

case STATE\_MSG:

this.btn\_msg\_list.setTextColor(Color.GREEN);

break;

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持得牛网。

[4154b10077321a8ee5bc2765b0c28970.png]: /images/20221014/4e7661e909054fb483b93ba1423d042d.png
[8f1899208b8232419fda252a1716ddab.png]: /images/20221014/cf0e962f2adf4956bda855eb8fe08a67.png

android 底部通知,Android Fragment实现底部通知栏

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