Android的数据存储

SharedPreferences

在一个Activity中存入数据

public class SharedPreferenceActivity extends Activity
{
    private EditText editText = null;
    private CheckBox checkBox = null;
    private Button button = null;
    private String ed_sString = null;
    private String ch_sString = null;
    private SharedPreferences.Editor editor = null;
    private SharedPreferences sharedPreferences = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sharepreference);
        editText = (EditText) findViewById(R.id.sh_edit);
        checkBox = (CheckBox) findViewById(R.id.sh_checkBox1);
        button = (Button) findViewById(R.id.sh_button1);

        sharedPreferences = getSharedPreferences("test", Activity.MODE_APPEND);
        editor = sharedPreferences.edit();
        button.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if (editText.getText() != null)
                {
                    ed_sString = editText.getText().toString();
                }
                if (checkBox.isChecked())
                {
                    ch_sString = checkBox.toString();
                }
                System.out.println(ed_sString + "---" + checkBox.isChecked());

                editor.putString("name", ed_sString);
                editor.putBoolean("checked", checkBox.isChecked());
                editor.commit();
            }
        });

    }
}

 

在另一个Activity中取出数据

public class SharedPreferencetgetActivity extends Activity
{
    TextView tView_1 = null;
    TextView tView_2 = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sharepreferece);
        tView_1 = (TextView) findViewById(R.id.share_1);
        tView_2 = (TextView) findViewById(R.id.share_2);
        SharedPreferences sharedPreferences = getSharedPreferences("test",
                Activity.MODE_PRIVATE);
        Boolean k = sharedPreferences.getBoolean("checked", false);

        tView_1.setText(sharedPreferences.getString("name", "122"));
        tView_2.setText(k.toString());

    }

}

 

setting

使用PreferenceFragment制作Setting：

preferences.XML文件

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <PreferenceCategory
        android:key="Category_1_key"
        android:summary="Category_1_sum"
        android:title="Category_1_title" >
        <EditTextPreference
            android:key="edit_1_key"
            android:summary="edit_1_sum"
            android:title="edit_1_title" >
        </EditTextPreference>

        <CheckBoxPreference
            android:selectable="true"
            android:title="checkbox_1_title" >
        </CheckBoxPreference>

        <ListPreference
            android:dialogTitle="list"
            android:entries="@array/pre"
            android:entryValues="@array/pre"
            android:key="list_key"
            android:summary="list_sum"
            android:title="list_title" />
    </PreferenceCategory>

    <Preference android:title="other" >
    </Preference>

    <PreferenceScreen android:title="Screen_SET" >
        <intent android:action="android.settings.WIFI_SETTINGS" />

        <EditTextPreference
            android:key="edittext_1_set"
            android:title="edittext_1_title" >
        </EditTextPreference>
    </PreferenceScreen>
</PreferenceScreen>

 

SharePreferenceStrActivity.java 文件

public class SharePreferenceStrActivity extends Activity
{

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        getFragmentManager().beginTransaction()
                .replace(android.R.id.content, new PrefsFragement()).commit();
    }

    @SuppressLint("NewApi")
    public static class PrefsFragement extends PreferenceFragment
    {
        @Override
        public void onCreate(Bundle savedInstanceState)
        {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.preference);
        }
    }

}

 

FileOutputStream与FlieInputStream

FileOutputStream

 

public class FileOperate extends Activity
{
    private FileOutputStream fileOutputStream = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);
        try
        {
            fileOutputStream = openFileOutput("test", Activity.MODE_APPEND);
        } catch (FileNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        PrintStream out = new PrintStream(fileOutputStream);
        out.print("姓名");

    }
}

FileInputStream

public class FileOperateRead extends Activity
{
    FileInputStream fileInputStream = null;
    String stringBuffer = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);
        try
        {
            fileInputStream = openFileInput("test");
        } catch (FileNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Scanner scanner = new Scanner(fileInputStream);
        while (scanner.hasNext())
        {
            System.out.println(scanner.next());
        }

    }

}

 

 

IO文件流的操作（可做缓存操作）

存入

public class FileIOOperate extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            System.out.println(Environment.getExternalStorageState().toString()
                    + File.separator);
            
            System.out.println(Environment.getExternalStorageDirectory().toString()
                    + File.separator);
            File file = new File(Environment.getExternalStorageDirectory()
                    .toString()
                    + File.separator
                    + "cjm"
                    + File.separator
                    + "test2");
            if (!file.getParentFile().exists())
            {
                file.getParentFile().mkdirs();
            }
            PrintStream out = null;
            try
            {
                out = new PrintStream(new FileOutputStream(file, true));
                out.println("testmytest");
            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } finally
            {
                if (out != null)
                {
                    out.close();
                }
            }
        } else
        {
            Toast.makeText(FileIOOperate.this, "没有SD", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}

取出

 

public class FileIOOperateGet extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            System.out.println(Environment.getExternalStorageState().toString()
                    + File.separator);
            File file = new File(Environment.getExternalStorageDirectory()
                    .toString()
                    + File.separator
                    + "cjm"
                    + File.separator
                    + "test2");
            if (!file.getParentFile().exists())
            {
                file.getParentFile().mkdirs();
            }
            Scanner scanner = null;
            try
            {
                scanner = new Scanner(new FileInputStream(file));
                while (scanner.hasNext())
                {
                    System.out.println(scanner.next());
                }

            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } finally
            {
                if (scanner != null)
                {
                    scanner.close();
                }
            }
        } else
        {
            Toast.makeText(FileIOOperateGet.this, "没有SD", Toast.LENGTH_SHORT)
                    .show();
        }
    }

}

 操作raw中的文件

public class OperatedRaw extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);
        Resources resources = getResources();
        InputStream inputStream = resources.openRawResource(R.raw.cjm);
        Scanner scanner = new Scanner(inputStream);
        while (scanner.hasNext())
        {
            System.out.println(scanner.next());
        }
        scanner.close();
        try
        {
            inputStream.close();
        } catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

该文件为只读文件

 

此处写json来操作数据的方式，因为在此后比较常用

public class JSONOperateArray extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        // 建立jsonObject对象用来装所有的数据
        JSONObject jsonObject = new JSONObject();
        // 建立jsonarray数组用来装每组数据
        JSONArray jsonArray = new JSONArray();
        for (int x = 0; x < 4; x++)
        {
            // 一组数据装在一个temp中
            JSONObject temp = new JSONObject();
            try
            {
                temp.put("name", "temp" + x);
            } catch (JSONException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            jsonArray.put(temp);
        }
        // 装入整个所有的数据 jsonObject 就是我们用来传送的数据
        try
        {
            jsonObject.put("jsonAll", jsonArray);
        } catch (JSONException e)
        {
            e.printStackTrace();
        }

        // 建立SDcard的文件夹和文件来装json数据
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            System.out.println(Environment.getExternalStorageState().toString()
                    + File.separator);

            System.out.println(Environment.getExternalStorageDirectory()
                    .toString() + File.separator);
            File file = new File(Environment.getExternalStorageDirectory()
                    .toString()
                    + File.separator
                    + "cjm"
                    + File.separator
                    + "json");
            if (!file.getParentFile().exists())
            {
                file.getParentFile().mkdirs();
            }

            // 通过Print将数据存在外部扩展卡地文件中
            PrintStream out = null;
            try
            {
                out = new PrintStream(new FileOutputStream(file, true));
                System.out.println(jsonArray.toString());
                out.println(jsonArray.toString());
            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } finally
            {
                if (out != null)
                {
                    out.close();
                }
            }
        } else
        {
            Toast.makeText(JSONOperateArray.this, "没有SDCard", Toast.LENGTH_SHORT)
                    .show();
        }

    }

}

 复杂数据存入

public class JSONOperateArray extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        // 建立jsonObject对象用来装所有的数据
        JSONObject jsonObject = new JSONObject();
        // 建立jsonarray数组用来装每组数据
        JSONArray jsonArray = new JSONArray();
        for (int x = 0; x < 4; x++)
        {
            // 一组数据装在一个temp中
            JSONObject temp = new JSONObject();
            try
            {
                //在temp中加入更多的数据
                temp.put("name", "temp" + x);
                temp.put("address", "temp" + x);
                temp.put("email", "temp" + x);
            } catch (JSONException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            jsonArray.put(temp);
        }
        // 装入整个所有的数据 jsonObject 就是我们用来传送的数据
        try
        {
            
            //在jsonObject中加入更多的数据
            jsonObject.put("json1", jsonArray);
            jsonObject.put("json2", "jsonObject"+1);
            jsonObject.put("json3", "jsonObject"+2);
        } catch (JSONException e)
        {
            e.printStackTrace();
        }

        // 建立SDcard的文件夹和文件来装json数据
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            System.out.println(Environment.getExternalStorageState().toString()
                    + File.separator);

            System.out.println(Environment.getExternalStorageDirectory()
                    .toString() + File.separator);
            File file = new File(Environment.getExternalStorageDirectory()
                    .toString()
                    + File.separator
                    + "cjm"
                    + File.separator
                    + "json");
            if (!file.getParentFile().exists())
            {
                file.getParentFile().mkdirs();
            }

            // 通过Print将数据存在外部扩展卡地文件中
            PrintStream out = null;
            try
            {
                out = new PrintStream(new FileOutputStream(file, true));
                System.out.println(jsonObject.toString());
                out.println(jsonObject.toString());
            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } finally
            {
                if (out != null)
                {
                    out.close();
                }
            }
        } else
        {
            Toast.makeText(JSONOperateArray.this, "没有SDCard",
                    Toast.LENGTH_SHORT).show();
        }

    }

}

 

 

获取json数据简单的

public class JSONOperateGET extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fileoperateinto);

        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            System.out.println(Environment.getExternalStorageState().toString()
                    + File.separator);
            System.out.println(Environment.getExternalStorageDirectory()
                    .toString() + File.separator);
            File file = new File(Environment.getExternalStorageDirectory()
                    .toString()
                    + File.separator
                    + "cjm"
                    + File.separator
                    + "json1");
            if (!file.getParentFile().exists())
            {
                file.getParentFile().mkdirs();
            }

            Scanner scanner = null;
            try
            {
                scanner = new Scanner(new FileInputStream(file));
                while (scanner.hasNext())
                {
                    String reString = scanner.next();

                    StringBuffer stringBuffer = new StringBuffer();
                    List<Map<String, Object>> all = getJson(reString);

                    for (int k = 0; k < all.size(); k++)
                    {
                        Map<String, Object> map = all.get(k);
                        System.out.println("1111--" + map.get("111"));
                        System.out.println("2222--" + map.get("222"));
                        System.out.println("3333--" + map.get("333"));

                    }
                }
            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } catch (Exception e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally
            {
                if (scanner != null)
                {
                    scanner.close();
                }
            }
        } else
        {
            Toast.makeText(JSONOperateGET.this, "没有SD", Toast.LENGTH_SHORT)
                    .show();
        }

    }

    private List<Map<String, Object>> getJson(String s) throws Exception
    {
        s = "[" + s + "]";
        System.out.println("list---" + s);
        List<Map<String, Object>> all = new ArrayList<Map<String, Object>>();
        JSONArray jsonArray = new JSONArray(s);
        for (int i = 0; i < jsonArray.length(); i++)
        {
            Map<String, Object> map = new HashMap<String, Object>();
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            map.put("111", jsonObject.getString("json2"));
            map.put("222", jsonObject.getString("json3"));
            map.put("333", jsonObject.getString("json1"));
            all.add(map);
        }
        return all;
    }

}