android 底部通知,Android Fragment实现底部通知栏
Android Fragment實(shí)現(xiàn)底部通知欄,供大家參考,具體內(nèi)容如下
截圖如下:
1. 第一步先要?jiǎng)?chuàng)建fragment(動(dòng)態(tài)注冊(cè))
然后將兩個(gè)勾選取消掉(還有一種是自己手動(dòng)創(chuàng)建)
會(huì)自動(dòng)生成相對(duì)應(yīng)的layout布局,剩下的要根據(jù)自己的需求了
2.在Activity的布局里寫好四個(gè)按鈕
這里不是重點(diǎn)…
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的代碼
其中定義了四個(gè)整型常量記錄了四個(gè)按鈕的狀態(tài),還有一個(gè)當(dāng)前狀態(tài),進(jìn)而判斷當(dāng)前點(diǎn)擊按鈕的狀態(tài),點(diǎn)擊切換文字顏色和圖標(biāo)
每次判斷四個(gè)Fragment的引用是否為空,不為空就不需要每次在new一遍Fragment
replace每次都會(huì)重新初始化fragment,它是先remove掉相同id的fragment,再add當(dāng)前fragment。
add不會(huì)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;
}
}
}
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