Android文件管理，实现全选，删除等操作

 

 

1.例中数据是读取sdcard中的文件：

package myapplication.com.myappexample;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.Environment;
import android.view.View;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


/**
 * Created by Administrator on 2016/12/3.
 */
public class SDcardHelper {

    public  static void save(String data, String name, Context context){
        try {
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                File sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录,2.2的时候为:/mnt/sdcart  2.1的时候为：/sdcard，所以使用静态方法得到路径会好一点。

                File filedir = new File(sdCardDir + File.separator + "MyjizhanFile");  // 这里的为创建的文件夹，在根目录下
                if (!filedir.exists()) {
                    filedir.mkdirs();
                }
                File saveFile = new File(filedir, name);  //  aaaa.txt保存到AA文件夹下
                FileOutputStream outStream1 = new FileOutputStream(saveFile);
                System.out.println(outStream1.toString());
                outStream1.write(data.getBytes());
                outStream1.close();
                Toast.makeText(context,"保存成功",Toast.LENGTH_SHORT).show();
            }

        } catch (IOException e) {

            e.printStackTrace();

        }
    }


    /***
     * 查找目录下所有的文件,例子中用到的数据及是读取的文件名称，和绝对路径
     * */
    public   static  List getFileName(File[] files) {
        Listdata=new ArrayList<>();
        String address="";
        if (files != null)// 先判断目录是否为空，否则会报空指针
        {
            for (File file : files) {
                if (file.isDirectory()) {
                    getFileName(file.listFiles());
                } else {
                    String fileName = file.getName();
                    address=file.getAbsolutePath();
                    data.add(new WenjianBean(fileName,address));

                }

            }
        }

        return data;

    }


}

2.简单的数据info

package myapplication.com.myappexample;

/**
 * Created by Administrator on 2016/12/4.
 */
public class WenjianBean {
    String name;
    String address;

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public WenjianBean(String name, String address) {
        this.name = name;
        this.address = address;
    }
}

3.ListView的item布局，需要屏蔽item中的checkbox的点击事件，重写了RelativeLayout

xml version="1.0" encoding="utf-8"?>
<myapplication.com.myappexample.MyRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="60dp"
    android:layout_marginRight="10dip"
    android:layout_weight="1.0"
    android:layout_marginLeft="10dp"
    android:orientation="horizontal"
    android:descendantFocusability="blocksDescendants"
    android:background="#AAAAAA"
    >

    <CheckBox

        android:id="@+id/isCheakBox"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:layout_alignParentRight="true" />
    
    <ImageView android:id="@+id/dailyPic"
        android:contentDescription="dailyPic"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginTop="3.0dip"
        android:src="@mipmap/txt"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"/>
    
    <TextView
        android:id="@+id/dailyName"
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:layout_toRightOf="@+id/dailyPic"
        android:text="日报名称"
        android:gravity="center_vertical"
        android:layout_centerVertical="true"
        android:textColor="#000000"
        android:textSize="18.0sp" />

myapplication.com.myappexample.MyRelativeLayout>

4. RelativeLayout

package myapplication.com.myappexample;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;

/**
 * Created by Administrator on 2017/1/16.
 */

public class MyRelativeLayout extends RelativeLayout {
    public MyRelativeLayout(Context context) {
        super(context);
    }

    public MyRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        /**
         * 
         * 这里返回true,事件处理操作返回到上一级操作
         * */
        return true;
    }
}

5.主布局

xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:background="@color/bai"
    tools:context="myapplication.com.myappexample.Rizhi_Activity">
    <LinearLayout
        android:layout_height="45dp"
        android:layout_width="match_parent"
        android:id="@+id/layout1"
        android:gravity="center_horizontal|center_vertical"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/textView_quxiao"
            android:layout_height="match_parent"
            android:layout_width="wrap_content"
            android:text="取消"
            android:layout_marginLeft="10dp"
            android:gravity="center_horizontal|center_vertical"
            android:textColor="@color/hei"/>
        <TextView
            android:id="@+id/textView_xuanze"
            android:layout_height="match_parent"
            android:layout_width="0dp"
            android:gravity="center_horizontal|center_vertical"
            android:layout_weight="1"
            android:text="已选择0项"
            android:textColor="@color/hei"/>
        <TextView android:id="@+id/all_check_btn"
            android:layout_width="wrap_content"
            android:text="全选"
            android:textColor="@color/red"
            android:gravity="center_vertical"
            android:layout_height="match_parent"
            android:layout_alignParentLeft="true"/>
    LinearLayout>

        <TextView
            android:id="@+id/text"
            android:layout_width="match_parent"
            android:layout_height="30dp"
            android:textColor="#6e6e6e"
            android:gravity="center_vertical"
            android:text="11"/>
        <ListView
            android:layout_marginTop="3dp"
            android:id="@+id/listView"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:layout_width="match_parent"/>

    <LinearLayout
        android:layout_height="45dp"
        android:layout_width="match_parent"
        android:id="@+id/layout3"

        android:gravity="center_horizontal|center_vertical"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/rizhi_textView_shanchu"
            android:layout_height="match_parent"
            android:layout_width="0dp"
            android:gravity="center_horizontal|center_vertical"
            android:layout_weight="1"
            android:text="删除"
            android:textColor="@color/hei"/>

    LinearLayout>
LinearLayout>

6.实现代码

package myapplication.com.myappexample;

import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class Rizhi_Activity extends AppCompatActivity{

    private static final String TAG = "Rizhi_Activity";
    TextView textView_quxiao,rizhi_textView_shanchu;
    TextView textView_xuanze;
    TextView text;
    private List itemList;
    private DraftDailyAdapter adapter;
    private Map isCheckedMap;
    private TextView allCheckBox;
    int count;
    int num_xuanze=0;
    ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rizhi);
        initView();
    }
    public void  initView(){
        listView= (ListView) findViewById(R.id.listView);
        text= (TextView) findViewById(R.id.text);
        textView_xuanze= (TextView) findViewById(R.id.textView_xuanze);
        /**
         * 获取该路径下面的文件名称和路径名称
         * */
        File file1=new File(Environment.getExternalStorageDirectory()+File.separator+"MyjizhanFile");
        File[] files = file1.listFiles();
        final Listdata=SDcardHelper.getFileName(files);
        Log.i(TAG, "initView:size "+data.size());
        textView_xuanze.setText("选中"+num_xuanze+"项");
        count=data.size();
        text.setText("查找到"+count+"个文件");
        allCheckBox = (TextView) findViewById(R.id.all_check_btn);
        itemList = new ArrayList();
        final ListView list= (ListView) findViewById(R.id.listView);
        isCheckedMap = new HashMap();
        //初始化数据
        for(int i=0;i){
            Item item = new Item();
            item.id=i;
            item.name = data.get(i).getName();
            item.address=data.get(i).getAddress();
            item.check=false;
            itemList.add(item);
        }
        adapter = new DraftDailyAdapter(this,itemList);
        list.setAdapter(adapter);
        textView_quxiao= (TextView) findViewById(R.id.textView_quxiao);
        rizhi_textView_shanchu= (TextView) findViewById(R.id.rizhi_textView_shanchu);
        /***
         * 文件删除
         * **/
        rizhi_textView_shanchu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ArrayList delitem=new ArrayList();
                for(int i=0;i){
                    if(itemList.get(i).check){
                        delitem.add(itemList.get(i));
                    }
                }
                for(int i=0;i){
                    itemList.remove(delitem.get(i));
                    delete(delitem.get(i).address);
                }
                adapter.notifyDataSetChanged();
                num_xuanze=0;
                textView_xuanze.setText("已选中"+num_xuanze+"项");
                text.setText("查找到"+count+"个文件");



            }
        });


        /**
         *
         * 取消
         * */
        textView_quxiao= (TextView) findViewById(R.id.textView_quxiao);
        textView_quxiao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for(int i=0;i){
                    if(itemList.get(i).check==true){
                        itemList.get(i).check=false;
                    }
                }
                allCheckBox.setTextColor(getResources().getColor(R.color.red));
                num_xuanze=0;
                textView_xuanze.setText(num_xuanze+"");
                adapter.notifyDataSetChanged();

            }
        });

        /****
         * 全选功能/
         * */

        allCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Log.i(TAG, "onClick: +data.size"+data.size());
                    for(int i=0;i){
                        if(itemList.get(i).check==false){
                            itemList.get(i).check=true;
                        }
                    }

                    allCheckBox.setTextColor(getResources().getColor(R.color.lv));
                    adapter.notifyDataSetChanged();
                    num_xuanze=itemList.size();
                    textView_xuanze.setText(num_xuanze+"");
                }




        });

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id) {

                CheckBox isCheakBox= (CheckBox) view.findViewById(R.id.isCheakBox);
                Item item= (Item) parent.getItemAtPosition(position);
                if(isCheakBox.isChecked()){
                    num_xuanze--;
                    item.check=false;

                }else {
                    num_xuanze++;
                    item.check=true;
                }
                textView_xuanze.setText("已选中" + num_xuanze + "项");
                adapter.notifyDataSetChanged();

            }
        });




    }

    /***
     *  adapter
     * **/
    class DraftDailyAdapter extends BaseAdapter {

        public List list;
        private Context context;
        LayoutInflater inflater;

        public DraftDailyAdapter(Context context, List list) {
            super();
            this.list = list;
            this.context = context;
            inflater = LayoutInflater.from(this.context);
        }
        @Override
        public int getCount() {
            return list == null ? 0 : list.size();
        }
        @Override
        public Object getItem(int location) {
            return list.get(location);
        }
        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            final Item item = list.get(position);
            //Item的位置
            final int listPosition = position;
            //这个记录item的id用于操作isCheckedMap来更新CheckBox的状态
            if(convertView == null){
                holder = new ViewHolder();
                convertView = inflater.inflate(R.layout.layout_listviewitem, null);
                holder.tvName = (TextView)convertView.findViewById(R.id.dailyName);
                holder.dailyPic= (ImageView) convertView.findViewById(R.id.dailyPic);
                holder.cBox = (CheckBox)convertView.findViewById(R.id.isCheakBox);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();
            }
            holder.cBox.setChecked(item.check);
            holder.tvName.setText(item.name);
            if(item.name.contains("txt")){
                holder.dailyPic.setImageResource(R.mipmap.txt);
            }else{
                holder.dailyPic.setImageResource(R.mipmap.txt);
            }

            return convertView;
        }
        public final class ViewHolder {
            public TextView tvName;
            public CheckBox cBox;
            ImageView dailyPic;
        }
    }

    class Item {
        private Integer id;
        private String name;
        boolean check;
        String address;
    }

    public boolean delete(String address) {
        File file = new File(address);
        if (file == null || !file.exists() || file.isDirectory()){
            return false;
        }
        file.delete();
        count--;
        if(num_xuanze==count){
            allCheckBox.setTextColor(getResources().getColor(R.color.lv));

        }else {
            allCheckBox.setTextColor(getResources().getColor(R.color.red));

        }
        return true;
    }




}

 7.

https://pan.baidu.com/s/1skZClmX

 

转载于:https://www.cnblogs.com/galibujianbusana/p/6288834.html