Android(安卓)数据的读取与写入2

完成效果：选择选项后退出，界面记住选择选项。

1.利用SharePreferences方法记住选择的选项

主布局：

<?xml version="1.0" encoding="utf-8"?>

布局效果：

代码：

package com.example.administrator.jreduch09.Class;import android.content.SharedPreferences;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import com.example.administrator.jreduch09.R;public class TestActivity extends AppCompatActivity {    private Button save;    private CheckBox cb1,cb2,cb3,cb4,cb5,cb6;    private SharedPreferences sp;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.homework);        save= (Button) findViewById(R.id.save);        cb1= (CheckBox) findViewById(R.id.cb1);        cb2= (CheckBox) findViewById(R.id.cb2);        cb3= (CheckBox) findViewById(R.id.cb3);        cb4= (CheckBox) findViewById(R.id.cb4);        cb5= (CheckBox) findViewById(R.id.cb5);        cb6= (CheckBox) findViewById(R.id.cb6);        op();        sp=getSharedPreferences("set.txt",MODE_APPEND);        save.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                SharedPreferences.Editor editor=sp.edit();                editor.putBoolean("1",cb1.isChecked());                editor.putBoolean("2",cb2.isChecked());                editor.putBoolean("3",cb3.isChecked());                editor.putBoolean("4",cb4.isChecked());                editor.putBoolean("5",cb5.isChecked());                editor.putBoolean("6",cb6.isChecked());                editor.commit();                            }        });    }    public void op(){        Boolean c1=sp.getBoolean("1",false);        Boolean c2=sp.getBoolean("2", false);        Boolean c3=sp.getBoolean("3",false);        Boolean c4=sp.getBoolean("4", false);        Boolean c5=sp.getBoolean("5",false);        Boolean c6=sp.getBoolean("6", false);        cb1.setChecked(c1);        cb2.setChecked(c2);        cb3.setChecked(c3);        cb4.setChecked(c4);        cb5.setChecked(c5);        cb6.setChecked(c6);    }}

2.将选择的选项写入到Sd卡中代码：

package com.example.administrator.jreduch09;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.TextView;import android.widget.Toast;import com.example.administrator.jreduch09.Class.shezhi;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.StreamCorruptedException;public class SettingActivity extends AppCompatActivity {     private Button save;     private CheckBox cb1,cb2,cb3,cb4,cb5,cb6;     private TextView word;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.homework);        save= (Button) findViewById(R.id.save);        cb1= (CheckBox) findViewById(R.id.cb1);        cb2= (CheckBox) findViewById(R.id.cb2);        cb3= (CheckBox) findViewById(R.id.cb3);        cb4= (CheckBox) findViewById(R.id.cb4);        cb5= (CheckBox) findViewById(R.id.cb5);        cb6= (CheckBox) findViewById(R.id.cb6);        word= (TextView) findViewById(R.id.word);        readFile();        word.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                AlertDialog.Builder builder=new AlertDialog.Builder(SettingActivity.this);                builder.setTitle("选择字体大小");                builder.setIcon(R.mipmap.ic_launcher);                final String [] items={"大","中","小"};                builder.setSingleChoiceItems(items, 1, new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int i) {                        Toast.makeText(getBaseContext(), items[i].toString(),                                Toast.LENGTH_SHORT).show();                        word.setText(items[i].toString());                        dialog.dismiss();                    }                });                AlertDialog alertDialog=builder.create();                alertDialog.show();            }        });        save.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                shezhi sz =new shezhi();                sz.setCb1(cb1.isChecked());                sz.setCb2(cb2.isChecked());                sz.setCb3(cb3.isChecked());                sz.setCb4(cb4.isChecked());                sz.setCb5(cb5.isChecked());                sz.setCb6(cb6.isChecked());                sz.setWord(word.getText().toString());                String state= Environment.getExternalStorageState();                if(!state.equals(Environment.MEDIA_MOUNTED)){                    return;                }                File root=Environment.getExternalStorageDirectory();                FileOutputStream fos=null;                ObjectOutputStream oos=null;                try {                    fos=new FileOutputStream(root+"/shezhi.txt");                    oos=new ObjectOutputStream(fos);                    oos.writeObject(sz);                } catch (FileNotFoundException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }finally {                    if(oos!=null){                        try {                            oos.flush();                            oos.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }            }        });    }    public void readFile(){        File root=Environment.getExternalStorageDirectory();        FileInputStream fis=null;        ObjectInputStream ois=null;        try {            fis=new FileInputStream(root+"/shezhi.txt");            ois=new ObjectInputStream(fis);            shezhi sz= (shezhi) ois.readObject();            cb1.setChecked(sz.isCb1());            cb2.setChecked(sz.isCb2());            cb3.setChecked(sz.isCb3());            cb4.setChecked(sz.isCb4());            cb5.setChecked(sz.isCb5());            cb6.setChecked(sz.isCb6());            word.setText(sz.getWord());        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (StreamCorruptedException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } catch (ClassNotFoundException e) {            e.printStackTrace();        }finally {            if(ois!=null){                try {                    ois.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}

效果展示：

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