关于自定义View

原创 于 2018-05-31 17:17:19 发布 · 295 阅读 · 0 ·
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本文介绍了一个自定义View的实现案例，包括动态添加控件、测量宽高及动画效果。同时，通过MVP模式整合OkHttp网络请求、数据库操作及XRecyclerView的刷新加载功能。

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关于自定义View，可以磊加控件 的宽高，并且有进入动画，

向自定义View动态加入控件

 

import android.content.Context;
import android.content.Intent;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import bwie.com.utils.SizeUtil;

public class MyView extends ViewGroup {
    public MyView(Context context) {
        super(context);
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    /**
     * 得到子View的宽高
     * @param widthMeasureSpec
     * @param heightMeasureSpec
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int endWidth = 0;
        int endHeight = 0;

        int childCount = getChildCount();

        if(childCount>0){
            for (int i = 0; i < childCount; i++) {
                View view = getChildAt(i);
                endHeight +=view.getMeasuredHeight();
                measureChild(view,widthMeasureSpec,heightMeasureSpec);
            }
        }
        endWidth = SizeUtil.SizeData(getContext());
        setMeasuredDimension(endWidth,endHeight);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int left = 0,top=0,right = 0,bottom=0;
        int child = getChildCount();
        for (int i = 0; i <child ; i++) {
            View view = getChildAt(i);

            view.layout(left,top,left + view.getMeasuredWidth(),top+view.getMeasuredHeight());

            left += view.getMeasuredWidth();

            top +=view.getMeasuredHeight();

            if(left+view.getMeasuredWidth() > SizeUtil.SizeData(getContext())){
                left=0;
            }


            view.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    TextView textView = (TextView) v;
                    Log.e("textView:","=="+textView.getText().toString());
                    Intent intent = new Intent(getContext(),MainActivity.class);
                    intent.putExtra("id",textView.getText().toString());
                    getContext().startActivity(intent);
                }
            });
            view.setOnLongClickListener(new OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {

                    removeView(v);

                    return true;
                }
            });

        }
    }
}

 

关于自定义View的Activity

 

import android.animation.ObjectAnimator;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import bwie.com.R;
import bwie.com.utils.SizeUtil;

public class ThreeActivity extends AppCompatActivity implements View.OnClickListener {

    private Button add;
    private int count = 0;
    private MyView myView;

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

        initView();
    }

    private void initView() {
        add = findViewById(R.id.but_add);
        add.setOnClickListener(this);
        myView = findViewById(R.id.myView);
    }

    @Override
    public void onClick(View v) {
        count++;

        int width = SizeUtil.SizeData(this);
//        Log.e("OPPOPOPO","==="+width);
        TextView textView = new TextView(this);
        textView.setText(count+"");
        textView.setTextSize(16);
        textView.setGravity(Gravity.CENTER);
        textView.setTextColor(Color.BLACK);


        ObjectAnimator objectAnimator = ObjectAnimator
                .ofFloat(textView,"translationX",(width-width/3),0);

        objectAnimator.setDuration(2000);
        objectAnimator.start();

        if(count == 1||count == 4||count == 7||count == 10||count == 13||count == 16||count == 19){
            textView.setBackgroundColor(Color.RED);
        }else if(count == 2||count == 5||count == 8||count == 11||count == 14||count == 17||count == 20){
            textView.setBackgroundColor(Color.YELLOW);
        }else {
            textView.setBackgroundColor(Color.BLUE);
        }

        myView.addView(textView);

        //View的参数
        ViewGroup.LayoutParams params = textView.getLayoutParams();
        params.width = width/3;
        params.height = 70;
        textView.setLayoutParams(params);

    }
}

 

 

 

工具类参上：

 

判断网络是否链接的工具类，需要添加权限

 

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtil {

    public static boolean isConn(Context context){
        //1.得到系统服务
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //2.得到网络信息类对象-需要添加权限
        NetworkInfo info = manager.getActiveNetworkInfo();
        //3.进行判断
        if(info!=null && info.isAvailable()){//已经连接网络
            return true;
        }else{
            return false;
        }
    }

}

 

 

 

OkHttp请求网络工具类

单例模式、二次封装、应用拦截器、get、post封装

 

import java.util.HashMap;
import java.util.Iterator;

import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.logging.HttpLoggingInterceptor;

public class OkHttpUtils {

    private static OkHttpUtils okHttpUtils;
    private OkHttpClient okHttpClient;

    private OkHttpUtils() {
        okHttpClient = new OkHttpClient.Builder()
                .addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
                .build();
    }

    public static OkHttpUtils getINSTANCE(){
        if(okHttpUtils == null){
            okHttpUtils = new OkHttpUtils();
        }
        return okHttpUtils;
    }

    public void getGet(String str, Callback callback){
        Request request = new Request.Builder()
                .get()
                .url(str)
                .build();
        okHttpClient.newCall(request).enqueue(callback);
    }

    public void getPost(String str, HashMap<String,String> map,Callback callback){
        FormBody.Builder builder = new FormBody.Builder();
        Iterator<String> iterator = map.keySet().iterator();
        while (iterator.hasNext()){
            String key = iterator.next();
            String value = map.get(key);
            builder.add(key,value);
        }
        Request request = new Request.Builder()
                .post(builder.build())
                .url(str)
                .build();
        okHttpClient.newCall(request).enqueue(callback);
    }

}

 

获得整个屏幕的宽度

 

自定义View时使用

 

import android.content.Context;
import android.util.DisplayMetrics;


public class SizeUtil {

    public static int SizeData(Context context){
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
        return metrics.widthPixels;
    }
}

 

 

 

MVP参上：

model：

 

import bwie.com.presenter.MyPresenterInterface;
import bwie.com.utils.OkHttpUtils;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class MyModel {

    public void getDate(String str, final MyPresenterInterface myPresenterInterface) {
        OkHttpUtils.getINSTANCE().getGet(str, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful() && response.code() == 200) {
                    String s = response.body().string();
                    myPresenterInterface.onSuccess(s);
                }
            }
        });

    }

    public void postDate(final String str, HashMap<String, String> map, final MyPresenterInterface myPresenterInterface) {
        OkHttpUtils.getINSTANCE().getPost(str, map, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful() && response.code() == 200) {
                    String s = response.body().string();

                    myPresenterInterface.onSuccess(s);
                }
            }
        });

    }

}

 

 

presenter

解绑与绑定

字符串替换是因为请求的数据格式不对，重新修饰一下

 

import java.util.HashMap;

import bwie.com.model.MyModel;
import bwie.com.view.MyViewInterface;

public class MyPresenter implements MyPresenterInterface {

    private MyModel myModel;
    private MyViewInterface myViewInterface;

    public MyPresenter(MyViewInterface myViewInterface) {
        this.myModel = new MyModel();
        atachView(myViewInterface);
    }

    /**
     * 绑定
     *
     * @param myViewInterface
     */
    public void atachView(MyViewInterface myViewInterface) {
        this.myViewInterface = myViewInterface;
    }

    /**
     * 解绑
     */
    public void detachView() {
        if (myViewInterface != null) {
            myViewInterface = null;
        }
    }

    public void getDate(String str) {
        myModel.getDate(str, this);
    }

    public void postDate(String str, HashMap<String, String> map) {
        myModel.postDate(str, map, this);
    }

    @Override
    public void onSuccess(Object obj) {
        String s = (String) obj;
        String str = s.replace("null(", "").replace(")", "");
        myViewInterface.onSuccess(str);
    }
}

 

presenter的接口

 

 

public interface MyPresenterInterface {
    void onSuccess(Object obj);
}

 

Activity的基类

 

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

public abstract class BaseActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(setView());
        initView();
        initDate();
    }

    abstract void initView();
    abstract void initDate();
    abstract int setView();
}

 

view

继承基类的MainActivity

XRecyclerView实现刷新与加载，请求网络时进行判断，如果有网络，请求进行显示并进行数据库存储，如果没有网络链接，使用上次存到数据库中的数据进行处理与展示

 

 

import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.widget.Toast;

import com.google.gson.Gson;
import com.jcodecraeer.xrecyclerview.XRecyclerView;

import java.util.HashMap;
import java.util.List;

import bwie.com.R;
import bwie.com.adapter.XRecyclerAdapter;
import bwie.com.common.Contants;
import bwie.com.db.DbHelper;
import bwie.com.model.BeanAll.NewsBean;
import bwie.com.presenter.MyPresenter;
import bwie.com.utils.NetUtil;

public class MainActivity extends BaseActivity implements MyViewInterface {

    private XRecyclerView xrcv;
    private int page = 5010;
    private boolean isRefresh = true;
    private Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            String s  = (String) msg.obj;
            Gson gson = new Gson();
            NewsBean newsBean = gson.fromJson(s, NewsBean.class);
            List<NewsBean.DataBean> list = newsBean.getData();

            if(isRefresh){

                adapter = new XRecyclerAdapter(list, MainActivity.this);
                xrcv.setAdapter(adapter);
                xrcv.refreshComplete();

                SQLiteDatabase db = dbHelper.getWritableDatabase();
                ContentValues contentValues = new ContentValues();
                contentValues.put("json",s);
                db.insert(DbHelper.DB_TABLE,null,contentValues);

            }else{
                if(adapter!=null){
                    adapter.loadMore(list);
                }
                xrcv.loadMoreComplete();
            }

        }
    };
    private MyPresenter presenter;
    private DbHelper dbHelper;
    private XRecyclerAdapter adapter;

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

        initView();
        initDate();
    }

    @Override
    void initView() {

        xrcv = (XRecyclerView) findViewById(R.id.xrcv);
        xrcv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        xrcv.setItemAnimator(new DefaultItemAnimator());
        xrcv.setPullRefreshEnabled(true);
        xrcv.setLoadingMoreEnabled(true);
        xrcv.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                isRefresh = true;
                page = 5010;
                request();
                xrcv.refreshComplete();
            }

            @Override
            public void onLoadMore() {
                isRefresh = false;
                page++;
                request();
                xrcv.loadMoreComplete();
            }
        });
    }

    @Override
    void initDate() {
        presenter = new MyPresenter(this);
        dbHelper = new DbHelper(this);
        request();
    }

    private void request() {

        Intent intent = getIntent();
        String id = intent.getExtras().getString("id");
        page = 5010+Integer.parseInt(id);

        if(NetUtil.isConn(this)){
            HashMap<String, String> map = new HashMap<>();
            map.put("type", page + "");
            presenter.postDate(Contants.POST_URl, map);
        }else{
            Toast.makeText(this,"无网络链接!",Toast.LENGTH_SHORT).show();

            String json = null;

            SQLiteDatabase db = dbHelper.getReadableDatabase();
            Cursor cursor = db.rawQuery("select * from news", null);
            while (cursor.moveToNext()){
                json = cursor.getString(cursor.getColumnIndex("json"));
            }

            NewsBean newsBean = new Gson().fromJson(json,NewsBean.class);
            XRecyclerAdapter adapter = new XRecyclerAdapter(newsBean.getData(),MainActivity.this);
            xrcv.setAdapter(adapter);

        }


    }

    @Override
    int setView() {
        return R.layout.activity_main;
    }

    @Override
    public void onSuccess(Object obj) {
        String s = (String) obj;

        Message msg = Message.obtain();
        msg.obj = s;
        handler.sendMessage(msg);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        presenter.detachView();
    }
}

 

view的接口：

 

 

public interface MyViewInterface {
    void onSuccess(Object obj);
}

 

XRecyclerView的适配器，并且多条目加载，其中有长按删除：

 

 

import android.content.Context;
import android.content.DialogInterface;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.jcodecraeer.xrecyclerview.XRecyclerView;

import java.util.List;

import bwie.com.R;
import bwie.com.common.Contants;
import bwie.com.model.BeanAll.NewsBean;

public class XRecyclerAdapter extends XRecyclerView.Adapter<XRecyclerView.ViewHolder> {

    private List<NewsBean.DataBean> list;
    private Context context;

    public XRecyclerAdapter(List<NewsBean.DataBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

    public void loadMore(List<NewsBean.DataBean> data){
        if(list!=null){
            list.addAll(data);
            notifyDataSetChanged();
        }
    }

    @NonNull
    @Override
    public XRecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if(viewType == Contants.TYPE1){
            View view = View.inflate(context, R.layout.item_rcv1,null);
            return new HolderType1(view);
        }else{
            View view = View.inflate(context, R.layout.item_rcv3,null);
            return new HolderType3(view);
        }
    }

    @Override
    public void onBindViewHolder(@NonNull final XRecyclerView.ViewHolder holder, int position) {

        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {

                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setTitle("确定删除吗？");
                builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        int p = holder.getLayoutPosition();
                        Log.e("Pos","p:"+p);
                            list.remove(p-1);
                            notifyItemRemoved(p);
                    }
                });
                builder.setNeutralButton("取消",null);
                builder.show();
                return true;
            }
        });

        NewsBean.DataBean data = list.get(position);
        if(holder instanceof HolderType1){
            Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType1) holder).img);
            ((HolderType1) holder).title.setText(data.getTopic());
            ((HolderType1) holder).time.setText(data.getDate()+"                "+data.getSource());
        }else if(holder instanceof HolderType3){

            ((HolderType3) holder).title.setText(data.getTopic());
            ((HolderType3) holder).time.setText(data.getDate()+"           "+data.getSource());
            if(data.getMiniimg()!=null && data.getMiniimg().size()>0){
                if(data.getMiniimg().size() == 1){
                    Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType3) holder).img1);
                    Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType3) holder).img2);
                    Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType3) holder).img3);
                }else if(data.getMiniimg().size() == 2){
                    Glide.with(context).load(data.getMiniimg().get(1).getSrc()).into(((HolderType3) holder).img1);
                    Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType3) holder).img2);
                    Glide.with(context).load(data.getMiniimg().get(1).getSrc()).into(((HolderType3) holder).img3);
                }else {
                    Glide.with(context).load(data.getMiniimg().get(0).getSrc()).into(((HolderType3) holder).img1);
                    Glide.with(context).load(data.getMiniimg().get(1).getSrc()).into(((HolderType3) holder).img2);
                    Glide.with(context).load(data.getMiniimg().get(2).getSrc()).into(((HolderType3) holder).img3);
                }
            }

        }

    }

    @Override
    public int getItemViewType(int position) {
        return position%3==2?Contants.TYPE1:Contants.TYPE3;
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    class HolderType1 extends XRecyclerView.ViewHolder{
        ImageView img;
        TextView title;
        TextView time;
        public HolderType1(View itemView) {
            super(itemView);
            img = itemView.findViewById(R.id.rcv1_img);
            title = itemView.findViewById(R.id.rcv1_text);
            time = itemView.findViewById(R.id.rcv1_ts);
        }
    }
    class HolderType3 extends XRecyclerView.ViewHolder{
        ImageView img1,img2,img3;
        TextView title,time;
        public HolderType3(View itemView) {
            super(itemView);
            img1 = itemView.findViewById(R.id.rcv3_img1);
            img2 = itemView.findViewById(R.id.rcv3_img2);
            img3 = itemView.findViewById(R.id.rcv3_img3);
            title = itemView.findViewById(R.id.rcv3_text);
            time = itemView.findViewById(R.id.rcv3_ts);
        }
    }

}

 

关于数据库的创建，表的创建：

 

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DbHelper extends SQLiteOpenHelper {

private static String DB_NAME = "news.db";
public static String DB_TABLE = "news";

    public DbHelper(Context context) {
        super(context, DB_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String sql = "create table "+DB_TABLE+" (_id Integer PRIMARY KEY,json text) ";
        db.execSQL(sql);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

 

全局需要：

 

 

public class Contants {
    public static String POST_URl = "http://ttpc.dftoutiao.com/jsonpc/refresh";
    public static int TYPE1 = 1;
    public static int TYPE3 = 3;
}

 

布局文件：

 

多条目1：

 

<?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="horizontal"
    android:padding="5dp">


    <ImageView
        android:id="@+id/rcv1_img"
        android:layout_width="0dp"
        android:layout_height="70dp"
        android:layout_weight="2"
        android:scaleType="centerCrop"
        android:src="@mipmap/ic_launcher" />


    <RelativeLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_weight="7">

        <TextView
            android:id="@+id/rcv1_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:maxLines="2"
            android:text="上的讲话不舒服就k看到世讲话不舒服就k看到世界很疯狂就"
            android:textSize="16dp"
            android:textStyle="bold" />


        <TextView
            android:id="@+id/rcv1_ts"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/rcv1_text"
            android:layout_marginTop="10dp"
            android:text="即使对方"
            android:textSize="12dp" />

    </RelativeLayout>


</LinearLayout>

 

多条目2：

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp">

    <TextView
        android:id="@+id/rcv3_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:singleLine="true"
        android:text="肯德基和疯狂的女人给会计的女人给会计年度浮亏加拿大"
        android:textSize="16dp"
        android:textStyle="bold" />


    <LinearLayout
        android:id="@+id/lin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/rcv3_text"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="5dp"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/rcv3_img1"
            android:layout_width="0dp"
            android:layout_height="70dp"
            android:layout_weight="1"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/rcv3_img2"
            android:layout_width="0dp"
            android:layout_height="70dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="1"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/rcv3_img3"
            android:layout_width="0dp"
            android:layout_height="70dp"
            android:layout_weight="1"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher" />

    </LinearLayout>


    <TextView
        android:id="@+id/rcv3_ts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/lin"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="5dp"
        android:text="的疯狂就是如果你              看到妇女你"
        android:textSize="12dp" />

</RelativeLayout>

 

 

 

 

权限：

 

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />

依赖：

 

implementation 'com.squareup.okhttp3:okhttp:3.10.0'
implementation 'com.github.bumptech.glide:glide:4.7.1'
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.squareup.okhttp3:logging-interceptor:3.10.0'
implementation 'com.jcodecraeer:xrecyclerview:1.5.9'

 

 

 

 

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