hzuapps#5 hzuapps#1336 第五次实验

Tianyidage · May 19, 2018 · a32ba0b · a32ba0b
1 parent b97c108
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diff --git a/com1614080901219/app4/src/main/AndroidManifest.xml b/com1614080901219/app4/src/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="edu.hzuapps.androidlabs.com1614080901219">
+
+    <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=".com1614080901219activity1"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name=".com1614080901219activity2" />
+        <activity android:name=".com1614080901219activity3"></activity>
+    </application>
+
+</manifest>
diff --git a/...pp4/src/main/java/edu/hzuapps/androidlabs/com1614080901219/com1614080901219activity1.java b/...pp4/src/main/java/edu/hzuapps/androidlabs/com1614080901219/com1614080901219activity1.java
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+package edu.hzuapps.androidlabs.com1614080901219;
+
+import android.support.v7.app.AppCompatActivity;
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.view.View.OnClickListener;
+
+public class com1614080901219activity1 extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_com1614080901219activity1);
+
+        final Activity thisActivity = this;
+
+        final Button button1 = (Button) findViewById(R.id.button_1);
+        final Button button2 = (Button) findViewById(R.id.button_2);
+        button1.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if(v.equals(button1)) {
+                    Intent intent = new Intent(thisActivity,com1614080901219activity2.class);
+                    thisActivity.startActivity(intent);
+                }
+            }
+        });
+        button2.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if(v.equals(button2)) {
+                    Intent intent = new Intent(thisActivity,com1614080901219activity3.class);
+                    thisActivity.startActivity(intent);
+                }
+            }
+        });
+
+    }
+}
diff --git a/...pp4/src/main/java/edu/hzuapps/androidlabs/com1614080901219/com1614080901219activity3.java b/...pp4/src/main/java/edu/hzuapps/androidlabs/com1614080901219/com1614080901219activity3.java
@@ -0,0 +1,203 @@
+package edu.hzuapps.androidlabs.com1614080901219;
+
+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.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+
+
+public class com1614080901219activity3 extends AppCompatActivity {
+    public static final String DIRECTORY = "demo";
+    public static final String FILENAME = "file_demo.txt";
+
+    public static final String TAG = com1614080901219activity3.class.getSimpleName();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_com1614080901219activity3);
+
+        ((Button) findViewById(R.id.button_save_external)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                String text1 = ((EditText) findViewById(R.id.text_content1)).getText().toString();
+                String text2 = ((EditText) findViewById(R.id.text_content2)).getText().toString();
+                saveTextIntoExternalStorage(text1);
+                saveTextIntoExternalStorage(text2);
+            }
+        });
+    }
+
+    // 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());
+
+        // 删除文件
+        // file.delete();
+        // deleteFile(FILENAME);
+    }
+
+    // 将文字保存到外部存储
+    private void saveTextIntoExternalStorage(String text) {
+        if (!isExternalStorageWritable()) {
+            Log.e(TAG, "外部存储不可写!");
+            return;
+        }
+
+        File dir = getPublicExtStorageDir(DIRECTORY, Environment.DIRECTORY_DOWNLOADS);
+        File file = new File(dir, FILENAME);
+
+        try {
+            FileOutputStream fos = new FileOutputStream(file);
+            fos.write(text.getBytes());
+            fos.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(TAG, "目录无法创建!");
+        }
+
+        long freeSpace = dir.getFreeSpace();
+        Log.i(TAG, "剩余空间大小: " + (freeSpace / 1024 / 1024) + "MB");
+        long totalSpace = dir.getTotalSpace();
+        Log.i(TAG, "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(TAG, "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());
+    }
+
+}
diff --git a/com1614080901219/app4/src/main/res/layout/activity_com1614080901219activity3.xml b/com1614080901219/app4/src/main/res/layout/activity_com1614080901219activity3.xml
@@ -0,0 +1,53 @@
+<?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=".com1614080901219activity3">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@drawable/p7"
+        android:orientation="vertical"
+        tools:layout_editor_absoluteX="62dp"
+        tools:layout_editor_absoluteY="0dp"
+        tools:ignore="MissingConstraints">
+
+        <EditText
+            android:id="@+id/text_content1"
+            android:hint=" 请输入你的昵称"
+            android:background="@null"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+        <EditText
+            android:id="@+id/text_content2"
+            android:background="@null"
+            android:hint=" 请输入你的年龄"
+            android:textCursorDrawable="@null"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+        <Button
+            android:id="@+id/button_save_external"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="保存到外部存储" />
+
+        <Button
+            android:id="@+id/button_save_internal"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textColor="#ffffffff"
+            android:text="保存到内部存储" />
+
+        <TextView
+            android:id="@+id/text_path"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+    </LinearLayout>
+
+</android.support.constraint.ConstraintLayout>
diff --git a/com1614080901219/e1.png b/com1614080901219/e1.png