复习-OKhttp-Gson-glide（一）

复习—OKhttp-Gson-glide

效果图

导入依赖

	//OkHttp（网络请求框架）
    implementation 'com.squareup.okhttp3:okhttp:3.12.1'
    debugImplementation 'com.squareup.okhttp3:logging-interceptor:3.12.1'
	//Gson(谷歌官方 Json 库)
    implementation 'com.google.code.gson:gson:2.8.5'
    //
    implementation('com.github.bumptech.glide:glide:4.9.0') {
        exclude group: "com.android.support"
    }

主要逻辑

第一，请求JSON数据-解析JSON

• 请求HTTPS，需配置network_config.xml

在res目录下新建xml文件夹 文件名为network_config.xml

<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
network-security-config>

• 在AndroidManifest.xml声明

 android:networkSecurityConfig="@xml/network_config"

• 代码

    private ImageJson LoadJson() {
        //第一步：请求HTTPS，需配置network_config.xml

        //第二步；请求接口(https://api.thecatapi.com/v1/images/search)  获取数据
        //1.添加依赖
        //2.OKHTTP操作
        //异步
        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder()
                .url("https://api.thecatapi.com/v1/images/search")
                .build();
        ArrayList<ImageJson> list = null;
        try {
            Response response = okHttpClient.newCall(request).execute();
            String string = response.body().string();
            //解析json
            Gson gson = new Gson();
            list = gson.fromJson(string, new TypeToken<List<ImageJson>>() {
            }.getType());


        } catch (IOException e) {
            e.printStackTrace();
        }

        Log.d("aaa1",list.get(0).toString());
        return list.get(0);

    }

第二，加载图

 Glide.with(itemView.getContext())
                        .load(url)
                        .diskCacheStrategy(DiskCacheStrategy.ALL)//采用了缓存策略
                        .placeholder(R.mipmap.ic_launcher）//还没加载出来的时候展示
                        .error(R.drawable.ic_close_black_24dp)//错误时展示
                        .into(image);

第三，流式布局

recy.setLayoutManager(new StaggeredGridLayoutManager(3,
                StaggeredGridLayoutManager.VERTICAL));
        recy.setHasFixedSize(true);
        RecyAdapter adapter = new RecyAdapter(lists);
        recy.setAdapter(adapter);

其他次重要的，如下

demo结构

DownloadActivity

public class DownloadActivity extends AppCompatActivity {
    private static final String JSONINFO = "jsoninit";
    Button bt1;
    Button tj;
    EditText et;
    TextView tv;

    int count = 0;
    private ArrayList<String> list = new ArrayList<String>();;

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

        bt1 = findViewById(R.id.bt1);
        et = findViewById(R.id.et_te);
        tv= findViewById(R.id.tv_text);
        tj = findViewById(R.id.bt_tj);

        tj.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String s = et.getText().toString();

                if (s!=null&&!s.equals("")){
                    count = Integer.parseInt(s);
                }
                tj.setEnabled(false);
                MyAsy myAsy = new MyAsy();
                myAsy.execute();
            }
        });


        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(DownloadActivity.this, MainActivity.class);

                intent.putExtra("list", list);
                startActivity(intent);
            }
        });
    }

    //AsyncTask
    class MyAsy extends AsyncTask<String, Integer, String>{

        @Override
        protected String doInBackground(String... strings) {
            int i=0;
            while (i<count){
                ImageJson imageJson = LoadJson();

//                Log.d("aaa", imageJson.toString());

                list.add(imageJson.getUrl());
                i++;
                publishProgress(i);
            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            int i =values[0];
            String s = tv.getText().toString();
            s = i+"--"+list.get(i-1)+"\n"+s;
            tv.setText(s);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            bt1.setEnabled(true);
        }
    }


    private ImageJson LoadJson() {
        //第一步：请求HTTPS，需配置network_config.xml

        //第二步；请求接口(https://api.thecatapi.com/v1/images/search)  获取数据
        //1.添加依赖
        //2.OKHTTP操作
        //异步
        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder()
                .url("https://api.thecatapi.com/v1/images/search")
                .build();
        ArrayList<ImageJson> list = null;
        try {
            Response response = okHttpClient.newCall(request).execute();

            String string = response.body().string();
            Gson gson = new Gson();
            list = gson.fromJson(string, new TypeToken<List<ImageJson>>() {
            }.getType());


        } catch (IOException e) {
            e.printStackTrace();
        }

        Log.d("aaa1",list.get(0).toString());
        return list.get(0);
    }
}

MainActivity

public class MainActivity extends AppCompatActivity {

    private static final String JSONINFO = "jsoninit";
    private ArrayList<String> lists;
    private RecyclerView recy;

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

//        Log.d("aaa1", recy.getTransitionName());

        Intent intent = getIntent();
        if (intent != null) {
            Serializable list = intent.getSerializableExtra("list");
            lists = (ArrayList<String>) list;
        }
        Log.d("aaa1", lists.toString());
        initview();
    }

    private void initview() {
        recy = findViewById(R.id.recy123);
        recy.setLayoutManager(new StaggeredGridLayoutManager(3,
                StaggeredGridLayoutManager.VERTICAL));
        recy.setHasFixedSize(true);
        RecyAdapter adapter = new RecyAdapter(lists);
        recy.setAdapter(adapter);
    }

}

ImageJson

public class ImageJson implements Serializable {
    private String id;
    private String url;
    private int width;
    private int height;

    @Override
    public String toString() {
        return "ImageJson{" +
                "id='" + id + '\'' +
                ", url='" + url + '\'' +
                ", width=" + width +
                ", height=" + height +
                '}';
    }
    ........
}

RecyAdapter

public class RecyAdapter extends RecyclerView.Adapter<RecyAdapter.BaseViewHolder>{

    private Resources res;

    private  ArrayList<String> dataList ;
    public RecyAdapter(ArrayList<String> list){
            dataList = list;
    }

    @NonNull
    @Override
    public BaseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new OneViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.recy_plur,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull BaseViewHolder holder, int position) {
        holder.setData(dataList.get(position));
    }

    @Override
    public int getItemCount() {
        return dataList != null ? dataList.size() : 0;
    }

	///这个BaseViewHolder好像没有发挥声明作用
    public class BaseViewHolder extends RecyclerView.ViewHolder {
        public BaseViewHolder(@NonNull View itemView) {
            super(itemView);
        }

        void setData(Object data){

        }
    }

    private class OneViewHolder extends BaseViewHolder{
        ImageView image;
        public OneViewHolder(@NonNull View view) {
            super(view);
            image = view.findViewById(R.id.recyImage);
            int width = ((Activity) image.getContext()).getWindowManager().getDefaultDisplay().getWidth();
            ViewGroup.LayoutParams params = image.getLayoutParams();
            params.width = width/3;
            params.height = (int) (200+Math.random()*200);
            image.setLayoutParams(params);
            res = itemView.getContext().getResources();
        }

        @Override
        void setData(Object data) {
            if (data != null) {
                String url = (String) data;
                Glide.with(itemView.getContext())
                        .load(url)
                        .diskCacheStrategy(DiskCacheStrategy.ALL)
                        .placeholder(R.mipmap.ic_launcher)
                        .error(R.drawable.ic_close_black_24dp)
                        .into(image);
//                Bitmap bitmap = BitmapFactory.decodeResource(res, R.mipmap.ic_launcher);
                //异步获得bitmap图片颜色值
            }
        }
    }
}

再见…