android之动态新建txt文件与读取

用到了几行代码，随手记录分享一下，动态手动输入文件名新建txt与存入的内容到txt文件，并且读取出来了，在文章最后附上DEMO

一、看一下简单demo效果图

二、接下里直接看代码了，

主界面代码：

public class MainActivity extends Activity implements OnClickListener {    private EditText mPathName;    private EditText mFileName;    private EditText mContent;    private Button mTest;    private Button mBtnRead;    private TextView mShowTet;    String filePath;    String fileName1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findid();    }    private void findid() {        mPathName = (EditText) findViewById(R.id.et_pathName);        mFileName = (EditText) findViewById(R.id.et_fileName);        mContent = (EditText) findViewById(R.id.et_content);        mTest = (Button) findViewById(R.id.btn_test);        mBtnRead = (Button) findViewById(R.id.btn_read);        mShowTet = (TextView) findViewById(R.id.Show_tet);        mTest.setOnClickListener(this);        mBtnRead.setOnClickListener(this);    }    private void getcontent() {        //动态创建文件        String pathName = mPathName.getText().toString();        String fileName = mFileName.getText().toString();        String content = mContent.getText().toString();        if (TextUtils.isEmpty(pathName)) {            Toast.makeText(this, "文件夹名不能为空", Toast.LENGTH_SHORT).show();        } else if (TextUtils.isEmpty(fileName)) {            Toast.makeText(this, "文件名不能为空", Toast.LENGTH_SHORT).show();        } else {            Tool tool = new Tool();            filePath = Environment.getExternalStorageDirectory()                    .getPath() + "/" + pathName + "/";            fileName1 = fileName + ".txt";            tool.writeTxtToFile(content, filePath, fileName1);// 将字符串写入到文本文件中            Toast.makeText(this, "创建成功", Toast.LENGTH_SHORT).show();        }    }    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.btn_test:                getcontent();                break;            case R.id.btn_read:                Tool tool = new Tool();//storage/emulated/0/z/z1.txt   地址也可添加为固定   filePath+fileName1  动态地址                mShowTet.setText(tool.readTxt("storage/emulated/0/z/z1.txt"));                break;        }    }}

三、其次就是主要的新建文件与存入文字、读取文字的工具类代码

/** * 工具类 * * @author gph */public class Tool {    /**     * 将字符串写入到文本文件中     */    public void writeTxtToFile(String strcontent, String filePath,                               String fileName) {        // 生成文件夹之后，再生成文件，不然会出错        makeFilePath(filePath, fileName);// 生成文件        String strFilePath = filePath + fileName;        // 每次写入时，都换行写        String strContent = strcontent + "\r\n";        try {            File file = new File(strFilePath);            if (!file.exists()) {                Log.d("TestFile", "Create the file:" + strFilePath);                file.getParentFile().mkdirs();                file.createNewFile();            }            RandomAccessFile raf = new RandomAccessFile(file, "rwd");            raf.seek(file.length());            raf.write(strContent.getBytes());            raf.close();        } catch (Exception e) {            Log.e("error:", e + "");        }    }    /**     * 生成文件     */    public File makeFilePath(String filePath, String fileName) {        File file = null;        makeRootDirectory(filePath);// 生成文件夹        try {            file = new File(filePath + fileName);            if (!file.exists()) {                file.createNewFile();            }        } catch (Exception e) {            e.printStackTrace();        }        return file;    }    /**     * 生成文件夹     */    public static void makeRootDirectory(String filePath) {        File file = null;        try {            file = new File(filePath);            if (!file.exists()) {                file.mkdir();            }        } catch (Exception e) {            Log.i("error:", e + "");        }    }    public String readTxt(String file) {        Log.e("LZ:", file);        BufferedReader bre = null;        String str = "";        String returnstr = "";        String a;        try {            bre = new BufferedReader(new FileReader(file));//此时获取到的bre就是整个文件的缓存流            while ((str = bre.readLine()) != null) { // 判断最后一行不存在，为空结束循环                Log.e("LZ", "readTxt: a------------" + str);                String[] arr = str.split("\\s+");                for (String ss : arr) {                    a = arr[0];                }                Log.e("LZ-----str:", str);                returnstr=str;            }        } catch (Exception e) {            Log.e("LZ", "readTxt: ---------------" + e.toString());        }        return returnstr;    }}

逻辑代码全部已贴，如需要demo请戳下面

github下载地址：戳一下

CSDN:下载地址：戳一戳

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