存储数据到文件

YXTS122 2016-12-14 07:01:05
LearningFilesActivity.java
package com.selfteaching.learningfiles;



import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;



import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;



public class LearningFilesActivity extends Activity implements OnClickListener{

	private Button bt1=null;

    private Button bt2=null;

    private EditText et=null;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_learning_files);

		et=(EditText)findViewById(R.id.txtText);

		bt1=(Button)findViewById(R.id.btnSave);

		bt1.setOnClickListener(this);

		bt2=(Button)findViewById(R.id.btnLoad);

		bt2.setOnClickListener(this);

	}

	

	@Override

    public void onClick(View v) {

        switch (v.getId()) {

        case R.id.btnSave:

        	String str=et.getText().toString();

        	try

        	{

        		FileOutputStream fOut=openFileOutput("textfile.txt",MODE_WORLD_READABLE);

        		OutputStreamWriter osw=new OutputStreamWriter(fOut);

        		

        		osw.write(str);

        		osw.flush();

        		osw.close();

        		

        		Toast.makeText(getBaseContext(), "保存文件成功", Toast.LENGTH_SHORT).show();

        		et.setText("");

        	

        	}

        	catch(IOException ioe)

        	{

        		ioe.printStackTrace();

        	}

        	break;

        case R.id.btnLoad:

        	try

        	{

        		FileInputStream fIn=openFileInput("textfile.txt");

        		InputStreamReader isr=new InputStreamReader(fIn);

        		

        		char[] inputBuffer=new char[100];

        		String s="";

        		int charRead;

        		while ((charRead=isr.read(inputBuffer))>0)

        		{

        			String readString=String.copyValueOf(inputBuffer, 0, charRead);

        			s+=readString;

        			inputBuffer=new char[100];

        		}

        		et.setText(s);

        		Toast.makeText(getBaseContext(), "加载文件成功", Toast.LENGTH_SHORT).show();

        		

        	}

        	catch(IOException ioe)

        	{

        		ioe.printStackTrace();

        	}

        	break;

        default:break;

        }

	}



	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.learning_files, menu);

		return true;

	}



	@Override

	public boolean onOptionsItemSelected(MenuItem item) {

		// Handle action bar item clicks here. The action bar will

		// automatically handle clicks on the Home/Up button, so long

		// as you specify a parent activity in AndroidManifest.xml.

		int id = item.getItemId();

		if (id == R.id.action_settings) {

			return true;

		}

		return super.onOptionsItemSelected(item);

	}

}


activity_learning_files.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.selfteaching.learningfiles.LearningFilesActivity"

    android:orientation="vertical" >



    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="@string/enter" />

    

    <EditText

        android:inputType="text" 

        android:id="@+id/txtText"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

    

    <Button 

        android:id="@+id/btnSave"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="@string/save" />

    

    <Button 

        android:id="@+id/btnLoad"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="@string/load" />

    

    

</LinearLayout>


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YXTS122 2018-02-18
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public class LearningFilesActivity extends Activity implements OnClickListener{
    private Button bt1=null;
    private Button bt2=null;
    private EditText et=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_learning_files);
        et=(EditText)findViewById(R.id.txtText);
        bt1=(Button)findViewById(R.id.btnSave);
        bt1.setOnClickListener(this);
        bt2=(Button)findViewById(R.id.btnLoad);
        bt2.setOnClickListener(this);
    }
     
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnSave:
        	 try {
                 FileOutputStream out = openFileOutput("xyxdata.txt", MODE_PRIVATE);
                 String content = et.getText().toString();

                // byte[] bytes = content.getBytes();

                 out.write(content.getBytes());
                 out.flush();
                 out.close();

             } catch (IOException e) {

             }
            break;
        case R.id.btnLoad:
        	 try {
                 FileInputStream inputStream = this.openFileInput("xyxdata.txt");
                 byte[] bytes = new byte[1024];
                 ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
                 while (inputStream.read(bytes) != -1) {
                     arrayOutputStream.write(bytes, 0, bytes.length);
                 }
                 inputStream.close();
                 arrayOutputStream.close();

                 String content = new String(arrayOutputStream.toByteArray());
                 et.setText(content);

             } catch (FileNotFoundException e) {
                 e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
             }
            break;
        default:break;
        }
    }
}
YXTS122 2017-04-29
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package com.example.tianjia;



import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.util.StringTokenizer;



import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;



public class TianjiaActivity extends Activity implements OnClickListener {

        private EditText name,phone;

        private Button button;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_tianjia);

		name=(EditText)findViewById(R.id.name);

		phone=(EditText)findViewById(R.id.one);

		button=(Button)findViewById(R.id.bt1);

        button.setOnClickListener(this);

	}

	

	 @Override

	    public void onClick(View v) {

	        switch (v.getId()) {

	        case R.id.bt1:

		Intent intent=new Intent();

		Bundle bundle=new Bundle();

		String name1=name.getText().toString();

		String phone1=phone.getText().toString();

		FileInputStream in;

		BufferedReader read = null;

		String s1="",s2="";

		try {

		               in = openFileInput("date5");

		               read = new BufferedReader(new InputStreamReader(in));

		               String line = "";

		               while ((line = read.readLine()) != null) {

		                   StringTokenizer st = new StringTokenizer(line, ";"); //设置数据之间 的分隔符为；

		                    s1 = st.nextToken();//读取的时候是 String 类

		                    s2 = st.nextToken();

		                   if (s1.equals(name1) || s2.equals(phone1) ) {

		                       Toast.makeText(TianjiaActivity.this, "该快捷拨号已存在", Toast.LENGTH_SHORT).show();

		                       //AlertDialog alertDialog=new AlertDialog();

		                       break;

		                   }

		               }

		           }catch (IOException e){

		               e.printStackTrace();

		           }finally {

		               try {

		                   if (read != null) {

		                       read.close();

		                   }

		               }catch(IOException e){

		                   e.printStackTrace();

		               }

		           }

		            if(!s1.equals(name1)&&!s2.equals(phone1)&&!TextUtils.isEmpty(name1)&&!TextUtils.isEmpty(phone1))

		            {

		            	Toast.makeText(TianjiaActivity.this, "关掉apk", Toast.LENGTH_LONG).show();

		                bundle.putString("name1",name1);

		                bundle.putString("phone1",phone1);

		                intent.putExtras(bundle);

		                setResult(RESULT_OK,intent);

		                finish();

		            }

	        }

	 }

	

	@Override

	protected void onDestroy() {

		super.onDestroy();

		Toast.makeText(TianjiaActivity.this, "正在保存数据", Toast.LENGTH_LONG).show();

	        String Input1 = name.getText().toString();

	        String Input2 = phone.getText().toString();

	        if(!TextUtils.isEmpty(Input1)&&!TextUtils.isEmpty(Input2)) 

	        	save(Input1, Input2);

	}

	public void save(String i1,String i2){

	    FileOutputStream out;

	    BufferedWriter writer=null;

	    FileInputStream in;

	    BufferedReader read=null;

	    String s1=null,s2=null;

	    try{

	        out=openFileOutput("date5", Context.MODE_APPEND);

	        in=openFileInput("date5");

	        writer=new BufferedWriter(new OutputStreamWriter(out));

	        read = new BufferedReader(new InputStreamReader(in));

	        String line="";

	        while((line=read.readLine())!=null){

	            StringTokenizer st = new StringTokenizer(line, ";"); //设置数据之间 的分隔符为；

	             s1 = st.nextToken();//读取的时候是 String 类

	             s2 = st.nextToken();

	            if(s1.equals(i1)||s2.equals(i2)) {

	                Toast.makeText(TianjiaActivity.this, "该快捷拨号已存在", Toast.LENGTH_SHORT).show();

	                return;

	            }

	        }

	        if(!TextUtils.isEmpty(i1)&&!TextUtils.isEmpty(i2)) {

	            writer.write(i1);

	            writer.write(";");

	            writer.write(i2);

	            writer.write(";");

	            writer.newLine();

	            Toast.makeText(TianjiaActivity.this, "已保存!", Toast.LENGTH_SHORT).show();

	        }

	    }catch(IOException e){

	        e.printStackTrace();

	    }finally {

	        try {

	            if (writer != null) {

	                writer.close();

	            }

	        }catch(IOException e){

	                e.printStackTrace();

	            }

	    }

	}



	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.tianjia, menu);

		return true;

	}



	@Override

	public boolean onOptionsItemSelected(MenuItem item) {

		// Handle action bar item clicks here. The action bar will

		// automatically handle clicks on the Home/Up button, so long

		// as you specify a parent activity in AndroidManifest.xml.

		int id = item.getItemId();

		if (id == R.id.action_settings) {

			return true;

		}

		return super.onOptionsItemSelected(item);

	}

}

  


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.tianjia.TianjiaActivity"

    android:orientation="vertical" >



    <EditText

        android:inputType="text" 

        android:id="@+id/name"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

    <EditText

        android:inputType="text"  

        android:id="@+id/one"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

    <Button 

        android:id="@+id/bt1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="请按返回键保存数据"/>

    



</LinearLayout>
YXTS122 2017-01-04
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package com.selfteaching.learningfiles;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class LearningFilesActivity extends Activity implements OnClickListener{
	private Button bt1=null;
    private Button bt2=null;
    private EditText et=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_learning_files);
		et=(EditText)findViewById(R.id.txtText);
		bt1=(Button)findViewById(R.id.btnSave);
		bt1.setOnClickListener(this);
		bt2=(Button)findViewById(R.id.btnLoad);
		bt2.setOnClickListener(this);
	}
	
	@Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnSave:
        	String str=et.getText().toString();
        	try
        	{
        		File sdCard=Environment.getExternalStorageDirectory();
        		File directory=new File(sdCard.getAbsolutePath()+"/myfiles");
        		directory.mkdirs();
        		File file=new File(directory,"textfile.txt");
        		FileOutputStream fOut=new FileOutputStream(file);
         		OutputStreamWriter osw=new OutputStreamWriter(fOut);
        		
        		osw.write(str);
        		osw.flush();
        		osw.close();
        		
        		Toast.makeText(getBaseContext(), "保存文件成功", Toast.LENGTH_SHORT).show();
        		et.setText("");
        	
        	}
        	catch(IOException ioe)
        	{
        		ioe.printStackTrace();
        	}
        	break;
        case R.id.btnLoad:
        	try
        	{
        		File sdCard=Environment.getExternalStorageDirectory();
        		File directory=new File(sdCard.getAbsolutePath()+"/myfiles");
        		File file=new File(directory,"textfile.txt");
        		FileInputStream fIn=new FileInputStream(file);
        		InputStreamReader isr=new InputStreamReader(fIn);
        		
        		char[] inputBuffer=new char[100];
        		String s="";
        		int charRead;
        		while ((charRead=isr.read(inputBuffer))>0)
        		{
        			String readString=String.copyValueOf(inputBuffer, 0, charRead);
        			s+=readString;
        			inputBuffer=new char[100];
        		}
        		et.setText(s);
        		Toast.makeText(getBaseContext(), "加载文件成功", Toast.LENGTH_SHORT).show();
        		
        	}
        	catch(IOException ioe)
        	{
        		ioe.printStackTrace();
        	}
        	break;
        default:break;
        }
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.learning_files, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}
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