運(yùn)行截圖

activity_main.xml（約束布局）

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><Buttonandroid: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" /><Buttonandroid: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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void btnRead(View view) {FileInputStream fileInputStream = null;try {// 1.打開文件fileInputStream = openFileInput("aaa.txt");// 2.讀操作 字節(jié)流（byte 10001） -----> 字符流（編碼）ASCLL 流操作// Stream 字節(jié)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.關(guān)閉文件if (fileInputStream != null) {try {fileInputStream.close();} catch (IOException e) {e.printStackTrace();}}}}public void btnWrite(View view) {FileOutputStream fileOutputStream = null;try {// 1.打開文件fileOutputStream = openFileOutput("aaa.txt", MODE_PRIVATE);// 2.寫操作fileOutputStream.write("衛(wèi)星同學(xué)，好帥啊~ 我也要嫁給他~~~".getBytes());} catch (Exception e) {e.printStackTrace();} finally {if (fileOutputStream != null) {try {fileOutputStream.close();} catch (IOException e) {e.printStackTrace();}}}}}

謝謝觀看，點(diǎn)贊再走~~~? ?求求了~~~

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