Android阶段学习总结 7.25-7.29 天气预报 知识点

总布局：一个Activity跳转到一个FragmentActivity中，并传递Json，FragmentActivity通过Fragment实现tab，并把Json传给每一个Fragment

一、MainActivity作为主界面，用AutoCompleteTextView选择地区，，提交地点，在按钮监听事件中，拼接好查找json路径，开子线程从网上得到json，在主线程中，通过Activity跳转，给Main传一个带Json的JsonParser对象

Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            parser.setJson((String)msg.obj);            Context context = MainActivity.this;            Intent intent = new Intent(MainActivity.this, Main.class);            intent.putExtra("parser", parser);            startActivity(intent);        }    };

JsonParser定义如下，他是序列化的，才能通过Intent传输

public class JsonParser implements Serializable{    Context context;    String json;    public void setJson(String json) {        this.json = json;    }    public String getJson() {        return json;    }//省略每一个JSONObject的Json解析方法，在上一博文中有具体步骤}

二、FragmentActivity： Main 接受JsonParser对象

设置get set 方法

public JsonParser getParser() {        return parser;    }public void setParser(JsonParser parser) {        this.parser = parser;    }

Intent intent = getIntent();        JsonParser parser = (JsonParser)intent.getSerializableExtra("parser");        this.setParser(parser);

二、动态加载Fragment实现每一页的Tab

FragmentActivity关联的xml布局如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@mipmap/back"    android:orientation="vertical">    <include layout="@layout/top" />    <FrameLayout        android:id="@+id/content"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_gravity="center"        android:layout_weight="1"></FrameLayout>    <include layout="@layout/bottom" /></LinearLayout>

写每一个Fragment 关联的xml布局，并定义Fragment，以一个为例，此Fragment中实现了未来7天的ListView

activity_recently.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <ListView        android:id="@id/android:list"        android:layout_width="match_parent"        android:layout_height="match_parent"></ListView></LinearLayout>

设置的每一个item的布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal" android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff">    <LinearLayout        android:layout_width="0dp"        android:layout_weight="1"        android:orientation="vertical"        android:layout_height="100dp">        <TextView            android:id="@+id/tv_recent_date"            android:background="#66ffffff"            android:text="29°"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <TextView            android:id="@+id/tv_recent_week"            android:background="#66ffffff"            android:text="33°"            android:textSize="10sp"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout>    <ImageView        android:id="@+id/iv_recent_weather"        android:layout_weight="1"        android:layout_width="0dp"        android:layout_height="100dp"        android:src="@mipmap/rain"/>    <LinearLayout        android:layout_width="0dp"        android:layout_weight="1"        android:orientation="vertical"        android:layout_height="100dp">        <TextView            android:id="@+id/tv_recent_temp"            android:background="#66ffffff"            android:text="29°"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <TextView            android:id="@+id/tv_recent_wind"            android:background="#66ffffff"            android:text="33°"            android:textSize="10sp"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />    </LinearLayout></LinearLayout>

Fragment定义必须的语句

public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.activity_recently, container, false);        return view;    }

通过下面的语句拿到有json的Parser对象

Main activity = (Main)getActivity();        parser = activity.getParser();

FragmentFuture如下：

public class FragmentFuture extends ListFragment {    private JsonParser parser;    private RecentAdapter recentAdapter;    private Context context;    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.activity_recently, container, false);        return view;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        Main activity = (Main)getActivity();        parser = activity.getParser();        context = activity;        List<Bean.ResultBean.FutureBean> futureList = parser.getFutureList(parser.getJson());        recentAdapter = new RecentAdapter(futureList,context);        setListAdapter(recentAdapter);    }}

RecentAdapter

public class RecentAdapter extends BaseAdapter {    private List<Bean.ResultBean.FutureBean> list;    private Context context;    //触发布局    private LayoutInflater inflater;    public RecentAdapter(List<Bean.ResultBean.FutureBean> list, Context context) {        this.list = list;        this.context = context;        inflater=LayoutInflater.from(context);    }    public RecentAdapter(Context context) {        this.context = context;        inflater=LayoutInflater.from(context);    }    public void setData(List<Bean.ResultBean.FutureBean> list) {        this.list = list;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Holder holder = null;       if (convertView == null) {            convertView = inflater.inflate(R.layout.item_recently,null);            holder = new Holder(convertView);            convertView.setTag(holder);        } else {            holder = (Holder)convertView.getTag();        }        Bean.ResultBean.FutureBean futureBean = list.get(position);        holder.tv_recent_date.setText(""+futureBean.getDate());        holder.tv_recent_week.setText(futureBean.getWeek());        holder.tv_recent_temp.setText(futureBean.getTemperature());        holder.tv_recent_wind.setText(futureBean.getWind());        return convertView;    }    class Holder {        private TextView tv_recent_date;        private TextView tv_recent_week;        private ImageView iv_recent_weather;        private TextView tv_recent_temp;        private TextView tv_recent_wind;        public Holder(View v) {            tv_recent_date = (TextView)v.findViewById(R.id.tv_recent_date);            tv_recent_week = (TextView)v.findViewById(R.id.tv_recent_week);            iv_recent_weather = (ImageView)v.findViewById(R.id.iv_recent_weather);            tv_recent_temp = (TextView)v.findViewById(R.id.tv_recent_temp);            tv_recent_wind = (TextView)v.findViewById(R.id.tv_recent_wind);        }    }}

Main 中对Fragment进行设置

package cn.edu.hpu.xiaoqian.weather2;import android.content.Intent;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.View;import android.view.Window;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.Toast;/** * Created by qianxiao on 2016/7/28. */public class Main extends FragmentActivity implements View.OnClickListener {    private JsonParser parser;    private LinearLayout tab1;    private LinearLayout tab2;    private LinearLayout tab3;    private LinearLayout tab4;    private ImageView img1;    private ImageView img2;    private ImageView img3;    private ImageView img4;    private Fragment frag1;    private Fragment frag2;    private Fragment frag3;    private Fragment frag4;    public JsonParser getParser() {        return parser;    }    public void setParser(JsonParser parser) {        this.parser = parser;    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.main);        Intent intent = getIntent();        JsonParser parser = (JsonParser)intent.getSerializableExtra("parser");        this.setParser(parser);        initView();        initEvent();        setSelect(1);    }    private  void initView() {        tab1 = (LinearLayout) findViewById(R.id.tab1);        tab2 = (LinearLayout) findViewById(R.id.tab2);        tab3 = (LinearLayout) findViewById(R.id.tab3);        tab4 = (LinearLayout) findViewById(R.id.tab4);        img1 = (ImageView) findViewById(R.id.iv_1);        img2 = (ImageView) findViewById(R.id.iv_2);        img3 = (ImageView) findViewById(R.id.iv_3);        img4 = (ImageView) findViewById(R.id.iv_4);    }    private void initEvent() {        tab1.setOnClickListener(this);        tab2.setOnClickListener(this);        tab3.setOnClickListener(this);        tab4.setOnClickListener(this);    }    private void setSelect(int i) {        FragmentManager fm = getSupportFragmentManager();        FragmentTransaction transaction = fm.beginTransaction();        hideFragment(transaction);        //图片设置        switch (i) {            case 0:                if(frag1 == null ) {                    frag1 = new FragmentIndex();                    transaction.add(R.id.content,frag1);                } else {                    transaction.show(frag1);                   // transaction.add(R.id.content, frag1);                }                break;            case 1:                if(frag2 == null ) {                    frag2 = new FragmentWeather();                    transaction.add(R.id.content,frag2);                } else {                    transaction.show(frag2);                   // transaction.add(R.id.content, frag1);                }                break;            case 2:                if(frag3 == null ) {                    frag3 = new FragmentFuture();                    transaction.add(R.id.content,frag3);                } else {                    transaction.show(frag3);                   // transaction.add(R.id.content, frag1);                }                break;            case 3:                if(frag4 == null ) {                    frag4 = new FragmentSetting();                    transaction.add(R.id.content,frag4);                } else {                   transaction.show(frag4);                   // transaction.add(R.id.content, frag1);                }                break;        }        transaction.commit();    }    private void hideFragment(FragmentTransaction transaction) {        if(frag1 != null) {            transaction.hide(frag1);        }        if(frag2 != null) {            transaction.hide(frag2);        }        if(frag3 != null) {            transaction.hide(frag3);        }        if(frag4 != null) {            transaction.hide(frag4);        }    }    @Override    public void onClick(View v) {        //resetImage        switch (v.getId()) {            case R.id.tab1:                setSelect(0);                Toast.makeText(Main.this, "点击一", Toast.LENGTH_SHORT).show();                break;            case R.id.tab2:                setSelect(1);                break;            case R.id.tab3:                setSelect(2);                break;            case R.id.tab4:                setSelect(3);                break;        }    }}

界面实现情况：

把这阶段的学习成果运用到了实际开发，项目虽小，但是很开心，很充实，我的成绩也被学长认可，很有收获。

学前端的同学29号用H5做了app，感觉很羡慕，也让我开阔了眼界，混合移动开发可能比较有发展空间，学好Android原生开发以后，好好学一下。

不足：Json串中，天气情况不能反应在图片上，界面较简单