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关于git就不讲了,python版块里有小甲鱼的视屏。接着说文件存储系统,先新建个项目,把activity_main.xml文件修改为- <?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.xinwei.filepersistencetest.MainActivity">
- <EditText
- android:id="@+id/edit"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:hint="Type something here"
- />
- </android.support.constraint.ConstraintLayout>
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把mainacticity.java文件修改为- package com.example.xinwei.filepersistencetest;
- import android.content.Context;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.widget.EditText;
- import java.io.BufferedWriter;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.OutputStreamWriter;
- public class MainActivity extends AppCompatActivity {
- private EditText edit;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- edit=(EditText)findViewById(R.id.edit);
- }
- @Override
- protected void onDestroy() {
- super.onDestroy();
- String inputText=edit.getText().toString();
- save(inputText);
- }
- private void save(String inputText) {
- FileOutputStream out=null;
- BufferedWriter writer=null;
- try {
- out=openFileOutput("data", Context.MODE_PRIVATE);
- writer=new BufferedWriter(new OutputStreamWriter(out));
- writer.write(inputText);
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }finally {
- if(writer!=null){
- try {
- writer.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
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在save()函数里是java文件操作的固定写法,只是openFileOutput这个函数是activity类里自带的函数。然后运行这个项目,随便在文本框里输入点内容。就可以储存到手机里了 |
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