Android : 頻道管理
阿新 • • 發佈：2018-12-04
需要再專案的build.gradle裡面寫上maven {url “https://jitpack.io”},否則依賴類會報錯. 效果圖在最後.
allprojects {
repositories {
google()
jcenter()
maven {url "https://jitpack.io"}
}
}
第三方框架需要的依賴
implementation 'com.github.andyoom:draggrid:v1.0.1'
其他jar包
implementation 'com.android.support:design:28.0.0' implementation 'com.google.code.gson:gson:2.8.5'
需要的許可權
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" <!--此處寫好上面那一行許可權直接alt+enter就可以出來--> tools:ignore="ProtectedPermissions" /> <!-- 往SDCard寫入資料許可權 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <!-- 震動許可權 --> <uses-permission android:name="android.permission.VIBRATE"/>
主頁面上的xml的程式碼
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.design.widget.TabLayout android:id="@+id/tl" android:layout_width="match_parent" android:layout_height="wrap_content" app:tabMode="scrollable" /> <TextView android:id="@+id/Add_Fragment" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerInParent="true" android:text="＋" android:textSize="40dp" /> </RelativeLayout> <android.support.v4.view.ViewPager android:id="@+id/View_Page" android:layout_width="match_parent" android:layout_height="match_parent"></android.support.v4.view.ViewPager> <ImageButton android:id="@+id/imgbtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_marginTop="92dp" android:layout_marginRight="250dp" android:src="@mipmap/ic_launcher" /> </LinearLayout>
Activity裡的主程式碼
package com.bwie.administrator.channel;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.andy.library.ChannelActivity;
import com.andy.library.ChannelBean;
import com.bwie.administrator.channel.frament.aaaFragment;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private TabLayout tl;
private TextView imgbtn;
private String jsonStr;
private ArrayList<ChannelBean> channelBeens;
private ViewPager View_Page;
private ArrayList<Fragment> datas = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initView() {
tl = findViewById(R.id.tl);
imgbtn = (TextView) findViewById(R.id.Add_Fragment);
View_Page = (ViewPager) findViewById(R.id.View_Page);
imgbtn.setOnClickListener(this);
}
private void initData() {
//準備欄目資料
channelBeens = new ArrayList<ChannelBean>();
channelBeens.add(new ChannelBean("熱點", true));
channelBeens.add(new ChannelBean("軍事", true));
channelBeens.add(new ChannelBean("八卦", false));
channelBeens.add(new ChannelBean("666", false));
datas.add(new aaaFragment());
datas.add(new bbbFragment());
datas.add(new cccFragment());
datas.add(new aaaFragment());
//把選擇的欄目（true）資料配置給tablayout
for (int i = 0; i < channelBeens.size(); i++) {
//進行判斷
if (channelBeens.get(i).isSelect()) {
tl.addTab(tl.newTab().setText(channelBeens.get(i).getName()));
}
}
View_Page.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
//此處加入if判斷,進行和fragment繫結,多少個條目就繫結多少次
if (channelBeens.get(i).getName().equals("熱點")){
return datas.get(0);
}else if (channelBeens.get(i).getName().equals("軍事")){
return datas.get(1);
}else if (channelBeens.get(i).getName().equals("八卦")){
return datas.get(2);
}else {
return datas.get(3);
}
}
@Override
public int getCount() {
int count = 0;
//迴圈
for (int i = 0; i < channelBeens.size(); i++) {
//進行判斷
if (channelBeens.get(i).isSelect()) {
count++;
}
}
return count;
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return channelBeens.get(position).getName();
}
});
tl.setupWithViewPager(View_Page);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.Add_Fragment:
ChannelActivity.startChannelActivity(MainActivity.this, channelBeens);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//為true表示是頻道管理回調回來的
if (requestCode == ChannelActivity.REQUEST_CODE && resultCode == ChannelActivity.RESULT_CODE) {
//得到欄目管理的結果
jsonStr = data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
//吐司檢視
Toast.makeText(this, jsonStr, Toast.LENGTH_SHORT).show();
//列印檢視
Log.i("main", jsonStr);
//清空之前的專案
tl.removeAllTabs();
//把新選擇的欄目結果更新到tablayout上
Gson gson = new Gson();
//進行json解析
Type type = new TypeToken<ArrayList<ChannelBean>>() {
}.getType();
channelBeens = gson.fromJson(jsonStr, type);
//遍歷結果,更新TabLayout
for (int i = 0; i < channelBeens.size(); i++) {
//進行判斷
if (channelBeens.get(i).isSelect()) {
try {
//此處是第三方框架的一個小坑,會報IllegalStateException非法語句異常所以直接try了,然後就可以解決異常
tl.addTab(tl.newTab().setText(channelBeens.get(i).getName()));
}catch (Exception e){
}
}
View_Page.getAdapter().notifyDataSetChanged();
}
}
}
Fragment是空的 只是為了驗證與fragment的聯動,就不上程式碼了,另外有些小坑都已經填了
效果圖就這麼多吧,第三方挺全 的,就是會出現小坑,需注意
以上;