谢谢观看,再走~~~ 求求了~~~运行截图


activity_main.xml(约束布局)
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="https://schemas.android.com/apk/res/android" xmlns:app="https://schemas.android.com/apk/res-auto" xmlns:tools="https://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="76dp" android:onClick="btnRead" android:text="btnRead" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.498" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="68dp" android:onClick="btnWrite" android:text="btnWrite" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.498" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/button" /> </androidx.constraintlayout.widget.ConstraintLayout>MainActivity.java
package cn.lwx.readwritetemplate; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void btnRead(View view) { FileInputStream fileInputStream = null; try { // 1.打开文件 fileInputStream = openFileInput("aaa.txt"); // 2.读操作 字节流(byte 10001) -----> 字符流(编码)ASCLL 流操作 // Stream 字节流,reader write字符流 BufferedReader reader = new BufferedReader(new InputStreamReader(fileInputStream)); String line = null; StringBuilder builder = new StringBuilder(); while ((line = reader.readLine()) != null) { builder.append(line); } System.out.println(builder.toString()); // String str = new String(); } catch (Exception e) { e.printStackTrace(); } finally { // 3.关闭文件 if (fileInputStream != null) { try { fileInputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } } public void btnWrite(View view) { FileOutputStream fileOutputStream = null; try { // 1.打开文件 fileOutputStream = openFileOutput("aaa.txt", MODE_PRIVATE); // 2.写操作 fileOutputStream.write("卫星同学,好帅啊~ 我也要嫁给他~~~".getBytes()); } catch (Exception e) { e.printStackTrace(); } finally { if (fileOutputStream != null) { try { fileOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
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