開發那點事（九）安卓開發，封裝常用方法，工作用

開發背景
思路來源於開發那點事（八）在js的基礎上封裝的一些功能，這次寫了一個安卓項目，並封裝了網絡請求，加載對話框，等常用的一些方法
公用方法

1 Common,LogUtil等工具類抽取
2 ApiRequest中GET POST等方法的封裝
3 BaseActivity的抽取
4 LoadDialog加載對話框實現

上乾貨

1 Common,LogUtil工具類抽取
Common類
單例模式，其中定義了網絡請求接口中的前綴，調試模式開關，並適配多環境打包。

package com.base.config;

public class Common {
    private static Common common = null;
    public String buildTip = "test";// 版本控制  test測試  online上線
    public Boolean appDebug = true;// 爲true時爲調試模式 正常輸出日誌
    public String preUrl = "";

    /**
     * 單例模式
     *
     * @return
     */
    public static Common getInstance() {
        if (common == null) {
            common = new Common();
            //根據buildTip的值來確定相應的url前綴
            switch (common.buildTip) {
                case "test":
                    common.preUrl = "http://mclasstest.club/JkReport/api/v1.";//test環境接口url前綴
                    break;
                case "online":
                    common.preUrl = "https://mclasstest.club/JkReport/api/v1.";//online環境接口url前綴
                    break;
            }
        }

        return common;
    }

    private Common() {
    }
}

LogUtil類
單例模式，根據Common類中的appDebug來判斷控制輸出，抽取TAG值

package com.base.util;

import android.util.Log;

import com.base.config.Common;

public class LogUtil {
    private static LogUtil logUtil = null;
    private static String TAG = "";
    private Common common = Common.getInstance();

    private LogUtil() {

    }

    /**
     * 單例模式
     *
     * @param tag log對應的TAG值，一般爲activity的類名
     * @return
     */
    public static LogUtil getInstance(String tag) {
        if (logUtil == null) {
            logUtil = new LogUtil();
        }
        TAG = tag;
        logUtil.log("初始化log輸出成功");
        return logUtil;
    }

    /**
     * 判斷調試模式,打印log值
     * @param content 輸出的內容
     */
    public void log(String content) {
        if (common.appDebug) {
            Log.d(TAG, content);
        }
    }
}

2 ApiRequest中GET POST等方法的封裝
ApiRequest
單例模式，引入Okhttp，Common中的preUrl與方法中的url形成完整的url，抽取相應的請求參數，定義接口回調，根據接口返回的內容將錯誤統一處理

package com.base.util;

import android.content.Context;
import android.os.Handler;
import android.widget.Toast;

import com.base.config.Common;
import com.base.dialog.LoadDialog;

import org.jetbrains.annotations.NotNull;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class ApiRequest {
    private Common common = Common.getInstance();
    private Context context;
    private static ApiRequest apiRequest = null;
    private LogUtil logUtil;
    private static OkHttpClient okHttpClient;

    private ApiRequest() {
        okHttpClient = new OkHttpClient().newBuilder().connectTimeout(10, TimeUnit.SECONDS).readTimeout(10, TimeUnit.SECONDS)
                .writeTimeout(10, TimeUnit.SECONDS).build();
    }


    public static ApiRequest getInstance(Context context, LogUtil logUtil) {
        if (apiRequest == null) {
            apiRequest = new ApiRequest();
        }
        apiRequest.context = context;
        apiRequest.logUtil = logUtil;
        return apiRequest;
    }

    /**
     * post請求
     *
     * @param url     接口名
     * @param params  post參數
     * @param apiUtil 回調
     */
    public void post(String url, Map<String, String> params, final ApiUtil apiUtil) {
        String realUrl = common.preUrl + url;
        FormBody.Builder builder = new FormBody.Builder();
        for (String key : params.keySet()) {
            builder.add(key, params.get(key));
        }
        FormBody formBody = builder.build();
        Request request = new Request.Builder()
                .post(formBody)
                .url(url)
                .build();
        final LoadDialog loadDialog = new LoadDialog(apiRequest.context);
        final Handler mHandler = new Handler();
        loadDialog.show();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                loadDialog.dismiss();
                if (apiRequest.logUtil != null) {
                    logUtil.log("onFailure");
                }
                showToast("未知原因，請重試");
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                loadDialog.dismiss();
                final String result = response.body().string();
                apiRequest.logUtil.log(result);
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            final JSONObject res = new JSONObject(result);
                            int responseCode = res.getInt("responseCode");
                            //如果 接口中responseCode等於0,說明返回正常，執行回調
                            if (responseCode == 0) {
                                apiUtil.requestCallBack(res);
                                return;
                            }
                            //否則輸出接口中定義的responseMessage錯誤信息
                            String responseMessage = res.getString("responseMessage");
                            showToast(responseMessage);

                        } catch (JSONException e) {
                            showToast("未知原因，請重試");
                        }
                    }
                });
            }
        });

    }

    /**
     * get請求
     *
     * @param url     接口名
     * @param params  get參數
     * @param apiUtil 回調
     */
    public void get(String url, Map<String, String> params, final ApiUtil apiUtil) {
        String realUrl = common.preUrl + url;
        int i = 0;
        for (String key : params.keySet()) {
            if (i == 0) {
                realUrl = realUrl + "?" + key + "=" + params.get(key);
            } else {
                realUrl = realUrl + "&" + key + "=" + params.get(key);
            }
            i++;
        }
        apiRequest.logUtil.log(realUrl);

        final LoadDialog loadDialog = new LoadDialog(apiRequest.context);
        loadDialog.show();
        Request request = new Request.Builder()
                .url(realUrl)
                .build();
        Call call = okHttpClient.newCall(request);
        final Handler mHandler = new Handler();
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                loadDialog.dismiss();
                if (apiRequest.logUtil != null) {
                    logUtil.log("onFailure");
                }
                showToast("未知原因，請重試");
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                loadDialog.dismiss();
                final String result = response.body().string();
                apiRequest.logUtil.log(result);
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            final JSONObject res = new JSONObject(result);
                            int responseCode = res.getInt("responseCode");
                            //如果 接口中responseCode等於0,說明返回正常，執行回調
                            if (responseCode == 0) {
                                apiUtil.requestCallBack(res);
                                return;
                            }
                            //否則輸出接口中定義的responseMessage錯誤信息
                            String responseMessage = res.getString("responseMessage");
                            showToast(responseMessage);

                        } catch (JSONException e) {
                            showToast("未知原因，請重試");
                        }
                    }
                });
            }
        });
    }

    public void login() {
    }

    public interface ApiUtil {
        public void requestCallBack(JSONObject result);
    }

    /**
     * 彈出響應對話框
     *
     * @param content 彈框提示內容
     */
    private void showToast(String content) {
        Toast.makeText(apiRequest.context, content, Toast.LENGTH_SHORT).show();
    }

    /**
     * 彈出長時間響應對話框
     *
     * @param content 彈框提示內容
     */
    private void showLongToast(String content) {
        Toast.makeText(apiRequest.context, content, Toast.LENGTH_LONG).show();
    }
}

3 BaseActivity的抽取
BaseActivity
所有Activty的基類，抽取相關的方法

package com.base.base;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.base.util.ApiRequest;
import com.base.util.LogUtil;

public abstract class BaseActivity extends Activity {
    protected LogUtil logUtil;
    protected ApiRequest apiRequest;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutId());
        initData();
        initView();
        setListen();
    }

    /**
     * 初始化數據
     */
    public void initData() {
        logUtil = LogUtil.getInstance(getClass().getSimpleName());
        apiRequest = ApiRequest.getInstance(this, logUtil);
    }


    /**
     * @return 頁面文件id
     */
    public abstract int getLayoutId();

    /**
     * 初始化頁面組件
     */
    public abstract void initView();

    /**
     * 設置組件響應事件
     */
    public abstract void setListen();

    /**
     * 彈出響應對話框
     *
     * @param content 彈框提示內容
     */
    public void showToast(String content) {
        Toast.makeText(this, content, Toast.LENGTH_SHORT).show();
    }

    /**
     * 彈出長時間響應對話框
     *
     * @param content 彈框提示內容
     */
    public void showLongToast(String content) {
        Toast.makeText(this, content, Toast.LENGTH_LONG).show();

    }
}

4 LoadDialog加載對話框實現
LoadDialog
繼承自Dialog，在構造方法中自定義對話框樣式，頁面文件，添加imageView旋轉動畫
LoadDialog類

package com.base.dialog;

import android.app.Dialog;
import android.content.Context;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.LinearInterpolator;

import androidx.annotation.NonNull;

import com.base.R;

public class LoadDialog extends Dialog {
    public LoadDialog(@NonNull Context context) {
        super(context, R.style.loading_dialog);
        initView();
    }

    private void initView() {
        setContentView(R.layout.dialog_loading);
        Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.load_dialog);
        animation.setInterpolator(new LinearInterpolator());
        findViewById(R.id.loading_dialog_img).startAnimation(animation);
        setCanceledOnTouchOutside(true);
        WindowManager.LayoutParams attributes = getWindow().getAttributes();
        attributes.alpha = 0.8f;
        getWindow().setAttributes(attributes);
        setCancelable(false);
    }
}

anim文件

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/overshoot_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
         #repeatCount爲-1時表示無限執行此動畫，在此表示imageView加載框一直出入旋轉中
        android:repeatCount="-1" 
        android:repeatMode="restart"
        android:toDegrees="+360" />

</set>

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