Android项目笔记二：用户自定义保存路径+文件列表显示+权限显示

﹏ヽ暗。殇╰゛Y 2022-08-22 13:25 25阅读 0赞

首先在AndroidManifest.xml添加权限：

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

xml布局文件：

<?xml version="1.0" encoding="utf-8"?>
    <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.tecapogee.www.lowpowerwireless.MySQLExportActivity">
    
        
        <TableRow
            android:id="@+id/my_aqlexportTableRow1"
            android:layout_height="wrap_content"
            android:layout_width="match_parent">
            <LinearLayout
                android:orientation="horizontal"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:layout_width="match_parent">
                <TextView
                    android:id="@+id/my_aqlexportTableRow1_TextView"
                    android:gravity="left"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" >
                </TextView>
            </LinearLayout>
    
        </TableRow>
    
    
        
        <TableRow
            android:id="@+id/my_aqlexportTableRow2"
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:layout_weight="1">
    
            <LinearLayout
                android:layout_weight="1"
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="match_parent">
                <ListView
                    android:id="@+id/my_aqlexport_ListView"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">
                </ListView>
            </LinearLayout>
        </TableRow>
    
    
        
        <TableRow
            android:id="@+id/my_aqlexportTableRow3"
            android:layout_height="match_parent"
            android:layout_width="match_parent">
    
            <LinearLayout
                android:orientation="horizontal"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:layout_width="match_parent">
    
                <ImageButton
                    android:background="#00000000"
                    android:src="@drawable/mycancle"
                    android:id="@+id/my_aqlexportTableRow3_ButtonCancel"
                    android:layout_weight="1"
                    android:onClick="my_mainButton_Cancel"
                    android:adjustViewBounds="true"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" >
                </ImageButton>
    
                <ImageButton
                    android:background="#00000000"
                    android:src="@drawable/mycopy"
                    android:id="@+id/my_aqlexportTableRow3_ButtonCopy"
                    android:layout_weight="1"
                    android:onClick="my_SQLExportButton_Save_onClick"
                    android:adjustViewBounds="true"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" >
                </ImageButton>
            </LinearLayout>
        </TableRow>
    
    </TableLayout>

java文件：

package com.tecapogee.www.lowpowerwireless;
    
    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.os.Environment;
    import android.os.Handler;
    import android.os.Message;
    import android.os.Process;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.KeyEvent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageButton;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import java.io.DataOutput;
    import java.io.DataOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Enumeration;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    public class MySQLExportActivity extends AppCompatActivity {
    
        protected ListView          my_SQLExport_listview             = null;
        protected TextView          my_SQLExport_CurrentDirectory    = null;
        private   ImageButton       myButtonSaveFile;
        public    Handler           my_SQLExportActivity               = null;
    
        private String              myStr_CurrentDirectory = "/";
        private String              myStr_RootDirectory = "/";
        private String              myStr_BackToLastDirectory = "/";
    
    
        final int[]       my_SQLExport_imageld=new int[]{R.drawable.file_root,R.drawable.file_back,
                                                               R.drawable.file_open,R.drawable.file_file,R.drawable.file_db};
    
    
        //导出数据库相关变量，开启一个线程保存，防止主UI不能响应
        private Thread              my_SQLExportActivity_Savethread=null;
        private boolean            isSaving = false;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_my_sqlexport);
    
            //初始化变量
            my_SQLExport_listview = (ListView)MySQLExportActivity.this.findViewById(R.id.my_aqlexport_ListView);
            my_SQLExport_CurrentDirectory=(TextView) MySQLExportActivity.this.findViewById(R.id.my_aqlexportTableRow1_TextView);
            myStr_RootDirectory = Environment.getRootDirectory().getPath().toString();
            myButtonSaveFile = (ImageButton) MySQLExportActivity.this.findViewById(R.id.my_aqlexportTableRow3_ButtonCopy);
            my_SQLExport_RefreshList("/");
    
            my_SQLExportActivity = new Handler(){
                @Override
                public void handleMessage(Message msg){
                    switch (msg.what){
                        case 1:
                            break;
                        case 2:
                            my_SQLExport_RefreshList(myStr_CurrentDirectory);
                            break;
                    }
                    Toast.makeText(MySQLExportActivity.this,msg.obj.toString(),Toast.LENGTH_SHORT).show();
                    super.handleMessage(msg);
                }
            };
    
            //List控件的监听事件
            my_SQLExport_listview.setOnItemClickListener(new AdapterView.OnItemClickListener(){
    
                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                    // TODO Auto-generated method stub
                    HashMap<String, String> my_map = (HashMap<String, String>) my_SQLExport_listview.getItemAtPosition(arg2);
                    String title = my_map.get("title");
                    /*Toast.makeText(MySQLExportActivity.this,content + "",Toast.LENGTH_SHORT).show();*/
                    switch (arg2){
                        case 0:
                            my_SQLExport_RefreshList(myStr_RootDirectory);
                            break;
                        case 1:
                            my_SQLExport_RefreshList(myStr_BackToLastDirectory);
                            break;
                        default:
                            if(title.contains(".")){
                                Toast.makeText(MySQLExportActivity.this,"这是一个文件，无法打开！！",Toast.LENGTH_SHORT).show();
                            }else {
                                if (!myStr_CurrentDirectory.equals("/")) {
                                    my_SQLExport_RefreshList(myStr_CurrentDirectory + "/" + title);
                                } else {
                                    my_SQLExport_RefreshList(myStr_CurrentDirectory + title);
                                }
                            }
                            break;
                    }
                }
            });
    
    
    
    
        }//END create
    
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event){
            if(keyCode == KeyEvent.KEYCODE_BACK){
                if(isSaving){
                    Toast.makeText(MySQLExportActivity.this,"正在保存，请稍等。。。。。。",Toast.LENGTH_SHORT).show();
                    return true;
                }
    
            }
            super.onKeyDown(keyCode, event);
            return true;
        }
    
        public void my_SQLExportButton_Save_onClick(View   my_onClick){
            if(isSaving){
                Toast.makeText(MySQLExportActivity.this,"正在保存，请稍等。。。。。。",Toast.LENGTH_SHORT).show();
                return;
            }
            isSaving = true;
            /*myButtonSaveFile.setEnabled(false);*/
            my_SQLExportActivity_Savethread = new Thread(new Runnable() {
                @Override
                public void run() {
                    String  strResult = null;
                    try {
                        File testFileCanWrite = new File(myStr_CurrentDirectory);
                        if (!testFileCanWrite.canWrite()) {
                            strResult = "没有操作权限！！";
                            Message SQLExportActivity_Savethread1 = new Message();
                            SQLExportActivity_Savethread1.what = 1;
                            SQLExportActivity_Savethread1.obj = strResult;
                            my_SQLExportActivity.sendMessage(SQLExportActivity_Savethread1);
                            /*Toast.makeText(MySQLExportActivity.this, "没有操作权限！！", Toast.LENGTH_SHORT).show();*/
                            testFileCanWrite = null;
                            return;
                        }
    
                        File oldfile = new File("/data/data/你的包名/databases/" + "你的文件名");
                        if (oldfile.exists()) {
                            /*Toast.makeText(MySQLExportActivity.this, "正在复制文件！！", Toast.LENGTH_SHORT).show();*/
                            strResult = "正在复制文件！！";
                            Message SQLExportActivity_Savethread2 = new Message();
                            SQLExportActivity_Savethread2.what = 1;
                            SQLExportActivity_Savethread2.obj = strResult;
                            my_SQLExportActivity.sendMessage(SQLExportActivity_Savethread2);
                            InputStream inputStream = new FileInputStream(oldfile);
    
                            String saveFilePath = "";
                            String saveFlieNema = "LW";
                            Calendar sys_timer = Calendar.getInstance();
    
                            saveFlieNema += sys_timer.get(Calendar.YEAR) + "-" + sys_timer.get(Calendar.MONTH) + "-" + sys_timer.get(Calendar.DATE) + " " +
                                    sys_timer.get(Calendar.HOUR_OF_DAY) + "-" + sys_timer.get(Calendar.MINUTE) + "-" + sys_timer.get(Calendar.SECOND) + ".db3";
    
                            saveFilePath = myStr_CurrentDirectory;
                            if (!myStr_CurrentDirectory.equals("/")) {
                                saveFilePath += "/";
                            }
                            saveFilePath += saveFlieNema;
    
                            File mySaveFile = new File(saveFilePath);
                            if (mySaveFile.exists()) {
                                mySaveFile.delete();
                            }
                            mySaveFile.createNewFile();
    
                            FileOutputStream fs = new FileOutputStream(mySaveFile, true);
                            byte[] inByte = new byte[1024 * 5];
                            int len;
    
                            while ((len = inputStream.read(inByte)) != -1) {
                                fs.write(inByte, 0, len);
                            }
                            inputStream.close();
                            fs.close();
                            oldfile = null;
                            mySaveFile = null;
                            /*Toast.makeText(MySQLExportActivity.this, "复制文件成功！！", Toast.LENGTH_SHORT).show();*/
                            strResult = "复制文件成功！！";
                            Message SQLExportActivity_Savethread3 = new Message();
                            SQLExportActivity_Savethread3.what = 2;
                            SQLExportActivity_Savethread3.obj = strResult;
                            my_SQLExportActivity.sendMessage(SQLExportActivity_Savethread3);
    
                        } else {
                            /*Toast.makeText(MySQLExportActivity.this, "源数据库文件不存在！！", Toast.LENGTH_SHORT).show();*/
                            strResult = "源数据库文件不存在！！";
                            Message SQLExportActivity_Savethread4 = new Message();
                            SQLExportActivity_Savethread4.what = 1;
                            SQLExportActivity_Savethread4.obj = strResult;
                            my_SQLExportActivity.sendMessage(SQLExportActivity_Savethread4);
                        }
                    }catch (Exception e) {
                        e.printStackTrace();
                        /*Toast.makeText(MySQLExportActivity.this, "复制文件出错！！", Toast.LENGTH_SHORT).show();*/
                        strResult = "复制文件出错！！";
                        Message SQLExportActivity_Savethread5 = new Message();
                        SQLExportActivity_Savethread5.what = 1;
                        SQLExportActivity_Savethread5.obj = strResult;
                        my_SQLExportActivity.sendMessage(SQLExportActivity_Savethread5);
                    }finally {
                        strResult = null;
                        isSaving = false;
    
                    }
                }
            });
            my_SQLExportActivity_Savethread.start();
        }
    
    
        public void my_SQLExport_RefreshList(String mDirectory){
            File myFile = new File(mDirectory);
            if(mDirectory.equals("/")){
                myStr_CurrentDirectory = myFile.getAbsolutePath();
                myStr_BackToLastDirectory = myStr_CurrentDirectory;
                myStr_RootDirectory = myStr_CurrentDirectory;
            }else {
                myStr_BackToLastDirectory = myFile.getParentFile().getAbsolutePath().toString();
                myStr_CurrentDirectory = myFile.getAbsolutePath();
            }
    
    
            my_SQLExport_CurrentDirectory.setText(myStr_CurrentDirectory);
    
            ArrayList<File> myFilesList = new ArrayList<File>();
            File[] filterFiles = myFile.listFiles();
            List<Map<String,Object>> my_list = new ArrayList<Map<String, Object>>();
    
            if((null != filterFiles) && (filterFiles.length>0)){
                for (File file : filterFiles){
                    myFilesList.add(file);
                }
            }
    
            Map<String,Object> map = null;
            //添加返回根目录
            map=new HashMap<String,Object>();
            map.put("image",my_SQLExport_imageld[0]);
            map.put("title","返回根目录");
            map.put("permission","");
            my_list.add(map);
            map = null;
            //添加返回上级目录
            map=new HashMap<String,Object>();
            map.put("image",my_SQLExport_imageld[1]);
            map.put("title","返回上级目录");
            map.put("permission","");
            my_list.add(map);
            map = null;
    
            for(int i=0;i<myFilesList.size();i++){
                map=new HashMap<String,Object>();
                if(myFilesList.get(i).getName().toString().contains(".db")){
                    map.put("image",my_SQLExport_imageld[4]);
                }else if(myFilesList.get(i).getName().toString().contains(".")){
                    map.put("image",my_SQLExport_imageld[3]);
                }else {
                    map.put("image",my_SQLExport_imageld[2]);
                }
    
                map.put("title",myFilesList.get(i).getName().toString());
    
                if(myFilesList.get(i).canWrite() && myFilesList.get(i).canRead()){
                    map.put("permission","可读可写");
                }else if((!myFilesList.get(i).canWrite()) && myFilesList.get(i).canRead()){
                    map.put("permission","只读");
                }else if(myFilesList.get(i).canWrite() && (!myFilesList.get(i).canRead())){
                    map.put("permission","只写");
                }else {
                    map.put("permission","无权限");
                }
    
                my_list.add(map);
                map=null;
            }
    
            SimpleAdapter adapter=new SimpleAdapter(MySQLExportActivity.this,my_list,R.layout.my_sqlexport_list_items,
                    new String[]{
      "title","permission","image"},
                    new int[]{R.id.my_sqlexport_list_items_Name,
                            R.id.my_sqlexport_list_items_Permissions,
                            R.id.my_sqlexport_list_items_ImageView});
            my_SQLExport_listview.setAdapter(adapter);
    
            myFile = null;
        }
    
        //取消按钮
        public void my_mainButton_Cancel(View   my_onClick) {
            if(isSaving){
                Toast.makeText(MySQLExportActivity.this,"正在保存，请稍等。。。。。。",Toast.LENGTH_SHORT).show();
                return;
            }
            this.finish();
        }
    
    }

列表xml:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/my_sqlexport_list_items_list_items_LinearLayout"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
    
        <ImageView
            android:id="@+id/my_sqlexport_list_items_ImageView"
            android:adjustViewBounds="true"
            android:maxHeight="72px"
            android:maxWidth="72px"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
    
        </ImageView>
    
        <TextView
            android:id="@+id/my_sqlexport_list_items_Name"
            android:gravity="left"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
        </TextView>
    
        <TextView
            android:id="@+id/my_sqlexport_list_items_Permissions"
            android:gravity="right"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
        </TextView>
    
    </LinearLayout>