实验7

students/soft1714080902301/实验7/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.myapplication">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".Main4Activity" android:theme="@style/MyDialogStyleBottom"/>
+        <activity android:name=".Main3Activity" />
+        <activity android:name=".Main2Activity" />
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

students/soft1714080902301/实验7/main/java/com/example/myapplication/Main2Activity.java

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+package com.example.myapplication;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.os.Environment;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+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;
+
+public class Main2Activity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main2);
+        Button button=(Button)findViewById(R.id.button);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                TextView spsl=findViewById(R.id.spsl);
+                TextView sl=findViewById(R.id.sl);
+                TextView spjg=findViewById(R.id.spjg);
+                TextView jg=findViewById(R.id.jg);
+                TextView spdd=findViewById(R.id.spdd);
+                TextView ddh=findViewById(R.id.ddh);
+                String text=spsl.getText().toString()+sl.getText().toString()+"\n"+spjg.getText().toString()+jg.getText().toString()+"\n"+spdd.getText().toString()+ddh.getText().toString();
+               // Log.i("1",spsl.getText().toString());
+                //save(text);
+                saveTextIntoExternalStorage(text);
+
+            }
+        });
+    }
+    private void save(String text){
+        // 获取内部存储目录
+        File dir = this.getFilesDir();
+        //File dir = getCacheDir();
+        File file = new File(dir,"test.txt");
+        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("test.txt", 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());
+            String line;
+            BufferedReader bReader = new BufferedReader(reader);
+            while ((line =bReader.readLine())!=null){
+                Log.i("读取","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());
+
+        // 删除文件
+        file.delete();
+        deleteFile("test.txt");
+    }
+
+    // 将文字保存到外部存储
+    private void saveTextIntoExternalStorage(String text) {
+        if (!isExternalStorageWritable()) {
+            Log.e("外部存储", "外部存储不可写!");
+            return;
+        }
+
+        File dir = getPublicExtStorageDir("DIRECTORY", Environment.DIRECTORY_DOWNLOADS);
+        File file = new File(dir, "test01.txt");
+
+        try {
+            FileOutputStream fos = new FileOutputStream(file);
+            fos.write(text.getBytes());
+            fos.close();
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        FileReader reader = null;
+        try {
+            reader = new FileReader(file.getAbsoluteFile());
+            String line;
+            BufferedReader bReader = new BufferedReader(reader);
+            while ((line =bReader.readLine())!=null){
+                Log.i("读取","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());
+    }
+
+    /* Checks if external storage is available for read and write */
+    private boolean isExternalStorageWritable() {
+        String state = Environment.getExternalStorageState();
+        if (Environment.MEDIA_MOUNTED.equals(state)) {
+            return true;
+        }
+        return false;
+    }
+
+    /* Checks if external storage is available to at least read */
+    private boolean isExternalStorageReadable() {
+        String state = Environment.getExternalStorageState();
+        if (Environment.MEDIA_MOUNTED.equals(state) ||
+                Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
+            return true;
+        }
+        return false;
+    }
+
+    // 创建公开的外部存储目录（App卸载时不会删除）
+    private File getPublicExtStorageDir(String dirName, String type) {
+        if (type == null) { // 指定文件类型
+            type = Environment.DIRECTORY_PICTURES;
+        }
+        File dir = new File(Environment.getExternalStoragePublicDirectory(type), dirName);
+        if (!dir.mkdirs()) {
+            Log.e("无法创建", "目录无法创建!");
+        }
+
+        long freeSpace = dir.getFreeSpace();
+        Log.i("剩余空间", "剩余空间大小: " + (freeSpace / 1024 / 1024) + "MB");
+        long totalSpace = dir.getTotalSpace();
+        Log.i("总空间", "总空间大小: " + (totalSpace / 1024 / 1024) + "MB");
+
+        return dir;
+    }
+
+    // 创建私有的外部存储目录（App卸载时会一同删除）
+    private File getPrivateExtStorageDir(Context context, String dirName, String type) {
+        if (type == null) { // 指定文件类型
+            type = Environment.DIRECTORY_PICTURES;
+        }
+        File file = new File(context //
+                .getExternalFilesDir(type), dirName);
+        if (!file.mkdirs()) {
+            Log.e("无法创建", "目录无法创建!");
+        }
+        return file;
+    }
+
+
+    private void showResult(String result) {
+        ((TextView) findViewById(R.id.text_path)) //
+                .setText(result.toCharArray(), 0, result.length());
+    }
+}

students/soft1714080902301/实验7/main/java/com/example/myapplication/Main3Activity.java

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+package com.example.myapplication;
+
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.TextView;
+
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class Main3Activity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main3);
+        getJson();
+        ImageButton imageButton=(ImageButton)findViewById(R.id.imageButton);
+        imageButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+
+                dispatchTakePictureIntent();
+
+            }
+        });
+    }
+    public void getJson(){
+        Thread thread=new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    String url_s="https://raw.githubusercontent.com/517865058/android-labs-2019/master/students/soft1714080902301/json/test.json";
+
+                    URL url=new URL(url_s);
+                    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
+                    conn.setConnectTimeout(5000);//设置超时
+                    conn.setUseCaches(false);//数据不多不用缓存了
+                    conn.connect();
+                    InputStream inputStream=conn.getInputStream();
+                    InputStreamReader inputStreamReader=new InputStreamReader(inputStream);
+                    BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
+
+                    if (conn.getResponseCode()==200){
+                        String inputLine;
+                        StringBuffer resultData=new StringBuffer();
+                        while ((inputLine=bufferedReader.readLine())!=null){
+                            resultData.append(inputLine);
+                        }
+                        String text=resultData.toString();
+                        Log.v("out-----",text);
+                        JSONObject jsonObject=new JSONObject(text);
+                        TextView textView=(TextView)findViewById(R.id.name);
+                        TextView textView1=(TextView)findViewById(R.id.username);
+                        textView.setText(jsonObject.getString("name"));
+                        textView1.setText(jsonObject.getString("username"));
+                        //JSONArray jsonArray=jsonObject.getJSONArray("");
+
+                    }
+                }catch (Exception e){
+                    e.printStackTrace();
+                }
+
+            }
+        });
+        thread.start();
+    }
+    static final int REQUEST_IMAGE_CAPTURE = 1;
+    private void dispatchTakePictureIntent() {
+        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
+        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
+            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
+            setResult(1);
+        }
+
+    }
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
+            Bundle extras = data.getExtras();
+            Bitmap imageBitmap = (Bitmap) extras.get("data");
+            ImageButton imageButton=(ImageButton)findViewById(R.id.imageButton);
+            imageButton.setImageBitmap(imageBitmap);
+        }
+    }
+
+}

students/soft1714080902301/实验7/main/java/com/example/myapplication/MainActivity.java

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+package com.example.myapplication;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.widget.Button;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        Button button=(Button) findViewById(R.id.v);
+        button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+
+                    // 另一个Activity的完整名称 = edu.androidlabs.soft123456(包名小写).Soft123456Activity(类名)
+                    Intent intent = new Intent(MainActivity.this,Main2Activity.class);
+                    startActivity(intent);
+                    //startActivity(intent);
+
+                }
+        });
+        Button button1=(Button) findViewById(R.id.me);
+        button1.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(MainActivity.this,Main3Activity.class);
+                startActivity(intent);
+            }
+        });
+
+    }
+}