今天上午完成了业务数据导入到手机，能显示汉字了。

今天上午完成了业务数据导入到手机，能显示汉字了。

MainActivity.java 文件内容如下

package com.strongdady.qrscan;

import java.util.Arrays;
import java.util.List;




import java.io.File;

import java.io.InputStream;

import java.io.FileOutputStream;

import android.database.sqlite.SQLiteDatabase;
import android.database.Cursor;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

import android.widget.Toast;
import android.content.Intent;



import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;


import static android.os.Environment.getExternalStorageDirectory;


public class MainActivity extends AppCompatActivity {

    private final int BUFFER_SIZE = 400000;
    public static final String DB_NAME = "device.db"; // 保存的数据库文件名称
    public static final String PACKAGE_NAME = "com.strongdady.qrscan";// 应用的包名
    //public static final String DB_PATH = "/data"droid.os.Environment.getDataDirectory().getAbsolutePath()+"/"
    public static final String DB_PATH =getExternalStorageDirectory()+"/data";

    String device_no = "";
    String owner="";
    String register_date = "";
    String device_name = "";
    String sqlString="";
    SQLiteDatabase db=null;
    Cursor cursor;

    private TextView mTextMessage;

    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {



        public void copyDBFile()
        {
            mTextMessage.append(DB_PATH);
            try {
                File myDataPath = new File(DB_PATH+"/device_db");
                if (!myDataPath.exists())
                {
                    mTextMessage.append("inside copydbfile 20180521=|"+myDataPath.toString()+"|enddbfile");
                    myDataPath.mkdirs();// 假设没有这个文件夹,则创建
                }
                else
                {
                    mTextMessage.append("inside copydbfile =|"+myDataPath.toString()+"|existed 2018_5-21!");
                }
                String dbfile=myDataPath+"/"+DB_NAME;
//                if (!(new File(dbfile).exists())) {// 推断数据库文件是否存在，若不存在则运行导入，否则直接打开数据库

                if (true) {// 推断数据库文件是否存在，若不存在则运行导入，否则直接打开数据库
                    InputStream is =getResources().openRawResource(R.raw.device); // 欲导入的数据库
                    FileOutputStream fos = new FileOutputStream(dbfile);
                    byte[] buffer = new byte[BUFFER_SIZE];
                    int count = 0;
                    while ((count = is.read(buffer)) > 0) {
                        fos.write(buffer, 0, count);
                    }
                    fos.close();
                    is.close();
                }
                db = SQLiteDatabase.openOrCreateDatabase(dbfile,null);

            } catch (Exception e)
            {
                mTextMessage.append(e.toString());
            }
        }


        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {

            switch (item.getItemId()) {
                case R.id.navigation_home:
                    mTextMessage.setText(R.string.title_home);

                    IntentIntegrator integrator=new IntentIntegrator(MainActivity.this);

                    //List<String> oDesiredFormats = Arrays.asList("UPC_A,UPC_E,EAN_13,EAN_8,RSS_14,RSS_EXPANDED,CODE_39,CODE_93,CODE_128,ITF,CODABAR,QR_CODE,DATA_MATRIX,PDF_417".split(","));
                    List<String> oDesiredFormats = Arrays.asList("PDF_417,UPC_A,UPC_E,EAN_13,EAN_8,RSS_14,RSS_EXPANDED,CODE_39,CODE_93,CODE_128,ITF,CODABAR,QR_CODE,DATA_MATRIX".split(","));

                    integrator.setPrompt("scanning .....");
                    integrator.initiateScan(oDesiredFormats);

                    return true;


                    case R.id.navigation_dashboard:
                    mTextMessage.setText(R.string.title_dashboard);

                        copyDBFile();

                    mTextMessage.append(" after open database ");
                    if(db!=null)
                        mTextMessage.append(" db not null");
                    else
                        mTextMessage.append(" db is  null!!");


                    try {
                        sqlString="SELECT * FROM device where device_no='1010-2012-000582'";
                        cursor = db.rawQuery(sqlString, null);
                     }catch (Exception e)
                    {
                        mTextMessage.append("exceipion e"+e.toString());
                    }
                    owner="init001";


                    while (cursor.moveToNext()) {
                        mTextMessage.append("!!!!!!!!!!!!");
                        device_name = cursor.getString(cursor.getColumnIndex("device_name"));
                        owner = cursor.getString(cursor.getColumnIndex("owner"));
                        register_date=cursor.getString(cursor.getColumnIndex("register_date"));
                        mTextMessage.append("+here+");
                    }

                    mTextMessage.append("after cursor!!!"+"sqlstring:"+sqlString);
                    mTextMessage.append("owner:"+owner);
                    return true;

                case R.id.navigation_notifications:
                    mTextMessage.setText(R.string.title_notifications);
                    return true;
            }
            return false;
        }
    };

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

        mTextMessage = (TextView) findViewById(R.id.message);
        BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (scanResult != null) {


            mTextMessage.setText("设备编号 "+device_no);

            Toast.makeText(this, device_no, Toast.LENGTH_LONG).show();
            //String dbOpenString="/data/data/com.strongdady.qrscan/device.db";
            //String dbOpenString=android.os.Environment.getDataDirectory().getAbsolutePath()+"device.db";

             if (db==null)
                    mTextMessage.append("db is null");

             else
                  mTextMessage.append("db is ok!");

             cursor = db.rawQuery("SELECT * FROM device where device_no = '1010-2012-000582'", null);


            while (cursor.moveToNext()) {
                device_name = cursor.getString(cursor.getColumnIndex("device_name"));
                owner = cursor.getString(cursor.getColumnIndex("owner"));
                register_date=cursor.getString(cursor.getColumnIndex("register_date"));
            }

            db.close();
            mTextMessage.append("设备名称："+device_name+owner+register_date);

        }
        else
        {
           //super.onActivityResult(requestCode, resultCode, data);
            return;
        }

    }
}