diff --git a/students/soft1714080902218/java/edu/hzuapps/androidlabs/soft1714080902218/TrdActivity.java b/students/soft1714080902218/java/edu/hzuapps/androidlabs/soft1714080902218/TrdActivity.java new file mode 100644 index 000000000..7dc4ef6d2 --- /dev/null +++ b/students/soft1714080902218/java/edu/hzuapps/androidlabs/soft1714080902218/TrdActivity.java @@ -0,0 +1,218 @@ +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(); + } + } + } + } +} diff --git a/students/soft1714080902218/res/layout/trd_activity.xml b/students/soft1714080902218/res/layout/trd_activity.xml new file mode 100644 index 000000000..48fffdef5 --- /dev/null +++ b/students/soft1714080902218/res/layout/trd_activity.xml @@ -0,0 +1,96 @@ + + + + + + +