package com.example.ts.myapplication;

import android.content.Context;
import android.os.Environment;
import android.os.storage.StorageManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;

import java.lang.reflect.Array;
import java.lang.reflect.Method;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    String TAG = "lum: ";
    String  path = "";
    Button buttonNC,buttonNZSD,buttonWZSD;

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

        buttonNC = (Button) findViewById(R.id.but_nz_id);   //内部存储
        buttonNZSD = (Button) findViewById(R.id.but_nzsd_id); //内置SD卡
        buttonWZSD = (Button) findViewById(R.id.but_wz_id); //外置SD 卡
        buttonNC.setOnClickListener(this);
        buttonNZSD.setOnClickListener(this);
        buttonWZSD.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.but_nz_id:　//获取内部存储　路径
                path = Environment.getDataDirectory().toString();
                Log.i(TAG,"内部存储路径 " + path);
                break;
            case R.id.but_nzsd_id:　　//获取　内置　ＳＤ 卡路径
                path = getStoragePath(this,false);  //一种方法
                Log.i(TAG,"内置SD 卡的路径 方法 1: " + path);
                path = Environment.getExternalStorageDirectory().toString();  //另一种方法
                Log.i(TAG,"内置SD 卡的路径 方法 2: " + path);
                break;

            case R.id.but_wz_id:　　// 获取　外置　ｓｄ 卡路径
                path = getStoragePath(this,true);
                Log.i(TAG,"外置SD 卡的路径: " + path);
                break;
        }
    }



    /**
     * 通过反射调用获取内置存储和外置sd卡根路径(通用)
     *
     * @param mContext    上下文
     * @param is_removale 是否可移除，false返回内部存储路径，true返回外置SD卡路径
     * @return
     */
    private static String getStoragePath(Context mContext, boolean is_removale) {
        String path = "";
        //使用getSystemService(String)检索一个StorageManager用于访问系统存储功能。
        StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);
        Class<?> storageVolumeClazz = null;
        try {
            storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
            Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
            Method getPath = storageVolumeClazz.getMethod("getPath");
            Method isRemovable = storageVolumeClazz.getMethod("isRemovable");
            Object result = getVolumeList.invoke(mStorageManager);

            for (int i = 0; i < Array.getLength(result); i++) {
                Object storageVolumeElement = Array.get(result, i);
                path = (String) getPath.invoke(storageVolumeElement);
                boolean removable = (Boolean) isRemovable.invoke(storageVolumeElement);
                if (is_removale == removable) {
                    return path;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return path;
    }

}