Android创建本地文件夹、创建本地文件以及访问本地文件
16lz
2021-01-26
在此之前,需要获得读写存储器的权限,在AndroidManifest.xml添加如下:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
1.Android创建本地文件夹
1.1.声明路径:
此处我使用的路径为:
path = getExternalFilesDir("exter_test").getPath();
其中getExternalFilesDir(“exter_test”)是获取“exter_test”文件夹的路径,getPath()是取其相对路径;
1.2.设定文件夹名:
此处我设置为:
fileName = "test.txt";
1.3.编辑界面
界面中放置一个Button和一个EditText,并为Button绑定事件。<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.a14553.localdocument.MainActivity"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="31dp" android:onClick="onClick" android:text="Button" /> <EditText android:id="@+id/editText" android:layout_width="200dp" android:layout_height="200dp" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:ems="10" android:inputType="textMultiLine" /> RelativeLayout>android.support.constraint.ConstraintLayout>
1.4.MainActivity中内容
public void onClick(View view){ newDirectory(path,"Test2"); //check(); //newFile(path,fileName); //edt.setText(readFile(path,fileName)); // save(edt.getText().toString()); }
public void newDirectory(String _path,String dirName){ File file = new File(_path+"/"+dirName); try { if (!file.exists()) { file.mkdir(); } }catch (Exception e){ e.printStackTrace(); } }
2.Android创建本地文件
2.1~2.3与1.1~1.3相同
2.4.MainActivity中内容
public void onClick(View view){ //newDirectory(path,"Test2"); //check(); newFile(path,fileName); //edt.setText(readFile(path,fileName)); // save(edt.getText().toString()); }
public void newFile(String _path,String _fileName){ File file=new File(_path+"/"+_fileName); try { if(!file.exists()) { file.createNewFile(); } } catch (IOException e) { e.printStackTrace(); } }
3.Android访问本地文件
3.1~3.3与1.1~1.3相同
3.4.MainActivity中内容
public void onClick(View view){ newDirectory(path,"Test2"); //check(); //newFile(path,fileName); //edt.setText(readFile(path,fileName)); // save(edt.getText().toString()); }
public String readFile(String _path,String _fileName){ String res = ""; try { BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(_path+"/"+_fileName))); String line = ""; while ((line = reader.readLine())!=null){ res+=line; } }catch (IOException e){ e.printStackTrace(); } return res; }
源工程代码
———————————–2018.03.08———————————–
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