Merge pull request #2041 from heyingsen/master

#5 #984 第五次实验

soft1614080902302/Fifth/java/edu/hzuapps/androidlabs/soft1614080902302/Soft1614080902302Activity.java

@@ -0,0 +1,142 @@
+package edu.hzuapps.androidlabs.soft1614080902302;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.View;
+import android.widget.EditText;
+import android.widget.TextView;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+import android.util.Log;
+import android.widget.Button;
+
+
+
+public class Main2Activity extends AppCompatActivity {
+    public static final String DIRECTORY = "demo";
+    public static final String FILENAME = "file_demo.txt";
+
+    public static final String TAG = Main2Activity.class.getSimpleName();
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main2);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        final Activity thisActivity = this;
+        Button chaxun = (Button) findViewById(R.id.chaxun);
+        chaxun.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Intent intent = new Intent(Main2Activity.this, Main3Activity.class);
+                thisActivity.startActivity(intent);
+            }
+        });
+        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                        .setAction("Action", null).show();
+            }
+        });
+        ((Button) findViewById(R.id.chaxun)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                String text = ((EditText) findViewById(R.id.editText)).getText().toString();
+                saveTextIntoInternalStorage(text);
+            }
+        });
+    }
+
+    // 将文字保存到内部存储
+    private void saveTextIntoInternalStorage(String text) {
+        // 获取内部存储目录
+        File dir = this.getFilesDir();
+        //File dir = getCacheDir();
+
+        if (dir.isDirectory()) {
+//            dir.mkdir();
+//            dir.mkdirs();
+        }
+
+        if (dir.isFile()) {
+            // D:/Abc.txt , -> D:/Abc1.txt ->D:/abc.txt
+        }
+
+        File file = new File(dir, FILENAME);
+
+//        try {
+//            File = File.createTempFile(FILENAME, null, dir);
+//        } catch (IOException e) {
+//            e.printStackTrace();
+//        }
+
+        if (file.exists()) { // 判断文件是否存在
+            Log.i(TAG, file.getAbsolutePath());
+            Log.i(TAG, file.length() + ""); // bytes*1024=kb *1024 MB
+            Log.i(TAG, file.isFile() + "");
+            file.canRead();
+            file.canWrite();
+            file.canExecute();
+
+            file.getFreeSpace();
+            file.getTotalSpace();
+        }
+
+        FileOutputStream fos = null;  // 字节流  | char | cn : gbk 2 bytes, utf8 3 bytes
+
+        try { // 使用API打开输出流
+            fos = openFileOutput(FILENAME, MODE_PRIVATE);
+            //FileOutputStream fos = new FileOutputStream(file);
+            fos.write(text.getBytes()); // 写入内容
+            fos.close(); // 关闭流
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                fos.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+        FileReader reader = null; // char
+
+        try {
+            reader = new FileReader(file.getAbsoluteFile());
+            BufferedReader bReader = new BufferedReader(reader);
+            String line = bReader.readLine();
+            Log.i(TAG, "从文件读取的内容: " + line);
+            bReader.close();
+            reader.close();
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        // 显示结果
+        showResult(file.getAbsolutePath());
+
+    }
+    private void showResult(String result) {
+        ((TextView) findViewById(R.id.textView)) //
+                .setText(result.toCharArray(), 0, result.length());
+    }
+
+}
+
+
+

soft1614080902302/Fifth/report5.md

@@ -0,0 +1,34 @@
+实验五
+
+一.实验目的
+掌握在Android App中存储数据
+
+二.实验内容
+根据选题要求使用文件存储
+
+1.将应用产生的数据保存到文件存储中；
+
+2.说明使用的文件存储方式：内部 or 外部；
+
+3.将运行结果截图。
+
+三.实验步骤
+
+1.建立一个查询按钮
+
+2.在按钮上添加监听器
+
+3.创建save存储文件的函数,我使用的是内部存储
+
+4.调用save函数.
+
+
+四.实验截图
+
+![image](https://github.com/heyingsen/android-labs-2018/blob/master/soft1614080902302/Fifth/tupian1.png)
+
+![image](https://github.com/heyingsen/android-labs-2018/blob/master/soft1614080902302/Fifth/tupian2.png)
+
+五.实验体会
+
+   这次实验我学会了简单的数据存储，利用java.io类提供的方法简单读写数据来存储，将文字保存到内部存储，获取内部存储，创建事件监听器对button控件进行处理