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Merge pull request #1916 from as05071/master
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#5 第五次实验 #836
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@zengsn
zengsn authored Jun 11, 2019
2 parents ebb0e8f + 46b0f7c commit 61d4510
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218 changes: 218 additions & 0 deletions students/soft1714080902218/java/edu/hzuapps/androidlabs/soft1714080902218/TrdActivity.java
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package edu.hzuapps.androidlabs.soft1714080902218;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;


public class TrdActivity extends Activity {
private EditText meEditTextContent;
private TextView tvContent;
private TextView mTextViewSdcard;

private Button button ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setBackgroundDrawableResource(R.drawable.blue);
setContentView(R.layout.trd_activity);

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


//绑定监听器
button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
Intent intent = new Intent(TrdActivity.this, DownloadFile.class) ;
startActivity(intent) ;
}

});
// 获取到相应的控件
meEditTextContent = (EditText) findViewById(R.id.etContent);
tvContent = (TextView) findViewById(R.id.tvContent);
mTextViewSdcard = (TextView) findViewById(R.id.tvsdcard);
}

/**
* 保存文件到手机内存中
*
* @param v
*/
public void save(View v) {
// 文件输出流
FileOutputStream out = null;
// 缓冲写入器
BufferedWriter writer = null;

// 要写入的数据
String str = meEditTextContent.getText().toString();

try {
// 用于将数据保存到指定的文件中，
// 第一个参数是文件名，第二个参数是文件的操作模式
// Context.MODE_PRIVATE写入的内容会覆盖原文件中的内容
// Context.MODE_APPEND如果文件已经存在，就往文件中追加内容，不存在就创建文件
out = openFileOutput("data.txt", Context.MODE_PRIVATE);
writer = new BufferedWriter(new OutputStreamWriter(out));

// 往外写数据
writer.write(str);
Toast.makeText(TrdActivity.this, "保存成功！", Toast.LENGTH_SHORT)
.show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 关闭流
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

/**
* 载入文件信息
*
* @param v
*/
public void load(View v) {
FileInputStream in = null;
BufferedReader reader = null;
StringBuilder builder = new StringBuilder();

try {
// 读取指定文件的信息
in = openFileInput("data.txt");
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
// 将读到的数据赋值给line，当line不为空的时候进行追加
while ((line = reader.readLine()) != null) {
builder.append(line);
}
// 将读取到的信息在文本中进行输出
tvContent.setText(builder.toString());
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (reader != null) {
try {
// 关闭输入流
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
}

/**
* 将信息写入到sd卡中
* 读写sd卡需要权限，在AndroidManifest.xml中设置android.permission.WRITE_EXTERNAL_STORAGE
*
* @param v
*/
public void saveTosdcard(View v) {
//文件输出流
FileOutputStream fos = null;
//要写入的数据
String str = meEditTextContent.getText().toString();

//设置文件路径 ，第一个参数是文件保存的路径，null放在根目录下，第二个参数是文件名
File file = new File(getExternalFilesDir(null), "/data.txt");

try {
fos = new FileOutputStream(file);
fos.write(str.getBytes());
Toast.makeText(TrdActivity.this, "保存到SD卡成功！", Toast.LENGTH_SHORT)
.show();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (fos != null) {
try {
// 关闭输入流
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

/**
* 从sd卡中读取信息进行显示
* 也需要权限，但在写入的时候已经给了权限，读取的时不需要分配权限
* 需要设置时在AndroidManifest.xml中设置android.permission.READ_EXTERNAL_STORAGE
* @param v
*/
public void loadFromSdcard(View v) {
//设置文件路径，第一个参数是文件保存的路径，null放在根目录下，第二个参数是文件名
File file = new File(getExternalFilesDir(null), "/data.txt");
//文件输入流
InputStream is = null;
try {
is = new FileInputStream(file);
//使用缓冲来读
byte[] buf = new byte[1024];// 每次读取1K的数据
StringBuilder sb = new StringBuilder();
// 当还存在数据的时候就一直读取
while (is.read(buf) != -1) {
sb.append(new String(buf).trim());
}

//将数据输入到文本中显示
mTextViewSdcard.setText(sb.toString());
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (is != null) {
try {
// 关闭输入流
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
96 changes: 96 additions & 0 deletions students/soft1714080902218/res/layout/trd_activity.xml
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<?xml version="1.0" encoding="utf-8"?>


<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<!-- 保存数据到手机内存中 -->
<Button
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/etContent"
android:layout_centerHorizontal="true"
android:text="保存"
android:onClick="save"/>

<!-- 要保存的数据 -->
<EditText
android:id="@+id/etContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btnSave"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="16dp"
android:ems="10" >

<requestFocus />
</EditText>

<!-- 将信息写入到sd卡中 -->
<Button
android:id="@+id/btnSaveTosdcard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/tvContent"
android:layout_below="@+id/btnLoad"
android:layout_marginTop="37dp"
android:onClick="saveTosdcard"
android:text="保存到SD卡" />

<!-- 读取信息输入到tvContent中 -->
<Button
android:id="@+id/btnLoad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btnSave"
android:layout_marginTop="19dp"
android:layout_toLeftOf="@+id/tvContent"
android:text="载入"
android:onClick="load" />

<TextView
android:id="@+id/tvContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnLoad"
android:layout_alignBottom="@+id/btnLoad"
android:layout_marginLeft="30dp"
android:layout_toRightOf="@+id/btnSave"
android:text="" />

<!-- 从SD卡中读取数据显示到tvsdcard文本中 -->
<Button
android:id="@+id/btnloadFromSdcard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btnSaveTosdcard"
android:layout_below="@+id/btnSaveTosdcard"
android:layout_marginTop="35dp"
android:text="从sd卡中读取信息"
android:onClick="loadFromSdcard"/>

<TextView
android:id="@+id/tvsdcard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnloadFromSdcard"
android:layout_alignBottom="@+id/btnloadFromSdcard"
android:layout_toRightOf="@+id/btnloadFromSdcard"
android:text="" />

<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btnloadFromSdcard"
android:layout_alignLeft="@+id/btnloadFromSdcard"
android:layout_marginTop="35dp"
android:background="@android:color/holo_orange_dark"
android:onClick="loadFromSdcard"
android:text="我要看图" />
</RelativeLayout>

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