hzuapps#5 惠大考试复习平台

Soft1614080902114/app/src/main/java/edu/hzuapps/android/soft1614080902114/Main4Activity.java

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+package com.example.soft1614080902114;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+
+public class Main4Activity extends AppCompatActivity {
+
+    private Button seek;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+                super.onCreate(savedInstanceState);
+                setContentView(R.layout.activity_main4);
+                seek=(Button)findViewById(R.id.button_seek);
+               seek.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                                final EditText tx= (EditText) findViewById(R.id.edittext_input);
+                                String s = tx.getText().toString();
+                                if(!s.isEmpty())
+                                        save(s);
+                               refresh(s);
+                            }
+        });
+                init();
+            }
+
+            public void save(String msg){
+                if(msg == null) return;
+                try {
+                        msg += read();
+                        FileOutputStream fos = openFileOutput("storage.txt",
+                                        MODE_APPEND);
+                        fos.write(msg.getBytes());
+                        fos.close();
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+            }
+
+            public String read() {
+                try {
+                        FileInputStream inStream = this.openFileInput("message.txt");
+                        byte[] buffer = new byte[1024];
+                       int hasRead = 0;
+                        StringBuilder sb = new StringBuilder();
+                        while ((hasRead = inStream.read(buffer)) != -1) {
+                                sb.append(new String(buffer, 0, hasRead));
+                            }
+                        inStream.close();
+                        return sb.toString();
+                    } catch (Exception e) {
+                       e.printStackTrace();
+                    }
+               return null;
+            }
+
+            private void refresh(String msg)
+    {
+                if(msg==null) return;
+               TextView textView = (TextView) findViewById(R.id.textview_history);
+                String s = textView.getText().toString();
+                textView.setText(s+"\n"+msg);
+            }
+
+            private void init()
+    {
+                TextView textView = (TextView) findViewById(R.id.textview_history);
+                String s = read();
+                if(s!=null)
+                        refresh(s);
+            }
+
+        }

Soft1614080902114/app/src/main/res/layout/activity_main4.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.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=".Main4Activity">
+
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:orientation="vertical">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="60dp"
+                android:orientation="horizontal">
+
+                <EditText
+                    android:id="@+id/edittext_input"
+                    android:layout_width="0dp"
+                    android:layout_height="match_parent"
+                    android:layout_weight="5"
+                    android:hint="输入" />
+                <Button
+                    android:id="@+id/button_seek"
+                    android:layout_width="80dp"
+                    android:layout_height="match_parent"
+                    android:text="查找"
+                    android:layout_gravity="center_horizontal"/>
+
+            </LinearLayout>
+
+
+            <TextView
+                android:id="@+id/textview_history"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:text="查询历史:"
+               />
+       </LinearLayout>
+</android.support.constraint.ConstraintLayout>