hzuapps#5 hzuapps#421 第5次实验

students/net1814080903141/src/main/AndroidManifest.xml

@@ -27,6 +27,9 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        <provider
+            android:authorities="edu.hzuapps.androidlabs.ContentProviderOfRecords"
+            android:name=".ContentProviderOfRecords"/>
     </application>
 
 </manifest>

students/net1814080903141/src/main/java/edu/hzuapp/androidlabs/net1814080903141/ContentProviderOfRecords.java

@@ -0,0 +1,183 @@
+package edu.hzuapp.androidlabs.net1814080903141;
+
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.SQLException;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.database.sqlite.SQLiteQueryBuilder;
+import android.net.Uri;
+import android.text.TextUtils;
+
+import java.util.HashMap;
+
+/**
+ * 类名最好改为: BookProvider
+ */
+public class ContentProviderOfRecords extends ContentProvider {
+
+    static final String PROVIDER_NAME = "edu.hzuapps.androidlabs.ContentProviderOfRecords";
+    static final String URL = "content://" + PROVIDER_NAME + "/records";
+    static final Uri CONTENT_URI = Uri.parse(URL);
+
+    static final String _ID = "_id";
+    static final String SCORE = "score";
+    static final String BEST = "best";
+
+    static final int RECORDS = 1;
+    static final int RECORD_ID = 2;
+
+    static final UriMatcher uriMatcher;
+
+    static {
+        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        uriMatcher.addURI(PROVIDER_NAME, "records", RECORDS);
+        uriMatcher.addURI(PROVIDER_NAME, "records/#", RECORD_ID);
+    }
+
+    // 数据库相关操作
+    private SQLiteDatabase db;
+    static final String DATABASE_NAME = "Game";
+    static final String TABLE_RECORDS = "records";
+    static final int DATABASE_VERSION = 1;
+    static final String CREATE_DB_TABLE =
+            " CREATE TABLE " + TABLE_RECORDS +
+                    " (_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
+                    " score TEXT NOT NULL, " +
+                    " best TEXT NOT NULL);";
+
+    /**
+     * 用于创建数据库的帮助类
+     */
+    private static class DatabaseHelper extends SQLiteOpenHelper {
+        DatabaseHelper(Context context) {
+            super(context, DATABASE_NAME, null, DATABASE_VERSION);
+        }
+
+        @Override
+        public void onCreate(SQLiteDatabase db) {
+            db.execSQL(CREATE_DB_TABLE);
+        }
+
+        @Override
+        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+            db.execSQL("DROP TABLE IF EXISTS " + TABLE_RECORDS);
+            onCreate(db);
+        }
+    }
+
+    private static HashMap<String, String> RECORDS_PROJECTION_MAP;
+
+    public ContentProviderOfRecords() {
+    }
+
+    @Override
+    public String getType(Uri uri) {switch (uriMatcher.match(uri)){
+        case RECORDS:
+            return "vnd.android.cursor.dir/vnd.example.students";
+        case RECORD_ID:
+            return "vnd.android.cursor.item/vnd.example.students";
+
+        default:
+            throw new IllegalArgumentException("Unsupported URI: " + uri);
+    }
+    }
+
+    // 插入|保存一条记录
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        long rowID = db.insert(TABLE_RECORDS, "", values);
+        if (rowID > 0) {
+            Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
+            getContext().getContentResolver().notifyChange(_uri, null);
+            return _uri;
+        }
+        throw new SQLException("无法插入数据 " + uri);
+    }
+
+    // 初始化内容提供器
+    @Override
+    public boolean onCreate() {
+        Context context = getContext();
+        DatabaseHelper dbHelper = new DatabaseHelper(context);
+        // 创建可写的数据库（如果没有则新建）
+        db = dbHelper.getWritableDatabase();
+        //db = dbHelper.getReadableDatabase()
+        return (db == null) ? false : true;
+    }
+
+    // 查询记录
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection,
+                        String[] selectionArgs, String sortOrder) {
+        SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
+        qb.setTables(TABLE_RECORDS);
+
+        switch (uriMatcher.match(uri)) {
+            case RECORDS:
+                qb.setProjectionMap(RECORDS_PROJECTION_MAP);
+                break;
+
+            case RECORD_ID:
+                qb.appendWhere(_ID + "=" + uri.getPathSegments().get(1));
+                break;
+
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        if (sortOrder == null || sortOrder == "") {
+            sortOrder = SCORE;
+        }
+        Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder);
+        c.setNotificationUri(getContext().getContentResolver(), uri);
+        return c;
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection,
+                      String[] selectionArgs) {
+        int count = 0;
+        switch (uriMatcher.match(uri)) {
+            case RECORDS:
+                count = db.update(TABLE_RECORDS, values, selection, selectionArgs);
+                break;
+
+            case RECORD_ID:
+                count = db.update(TABLE_RECORDS, values, _ID + " = " + uri.getPathSegments().get(1) +
+                        (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
+                break;
+
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        getContext().getContentResolver().notifyChange(uri, null);
+        return count;
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        int count = 0;
+        switch (uriMatcher.match(uri)) {
+            case RECORDS:
+                count = db.delete(TABLE_RECORDS, selection, selectionArgs);
+                break;
+
+            case RECORD_ID:
+                String id = uri.getPathSegments().get(1);
+                count = db.delete(TABLE_RECORDS, _ID + " = " + id +
+                        (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
+                break;
+
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        getContext().getContentResolver().notifyChange(uri, null);
+        return count;
+    }
+}

students/net1814080903141/src/main/java/edu/hzuapp/androidlabs/net1814080903141/GameActivity.java

@@ -1,14 +1,64 @@
 package edu.hzuapp.androidlabs.net1814080903141;
 
+
+import android.content.ContentValues;
+import android.net.Uri;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
 
 import androidx.appcompat.app.AppCompatActivity;
 
 public class GameActivity extends AppCompatActivity {
 
+    private Button btnsave;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_game);
+
+        btnsave=findViewById(R.id.btnsave);
+
+        final GameActivity thisActivity=this;
+        // 保存记录信息
+        btnsave.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                thisActivity.saveRecord();
+            }
+        });
+
+    }
+
+    private void saveRecord() {
+        String score = ((EditText) findViewById(R.id.tscore)).getText().toString();
+        String best = ((EditText) findViewById(R.id.tbest)).getText().toString();
+
+        // 插入新记录
+        ContentValues record = new ContentValues();
+        //book.put("name", name); // Map <- Key:Value
+        record.put(ContentProviderOfRecords.SCORE,score);
+        record.put(ContentProviderOfRecords.BEST, best);
+
+        Uri uri = getContentResolver() // 执行插入操作
+                .insert(ContentProviderOfRecords.CONTENT_URI, record);
+
+        Toast.makeText(getBaseContext(), //
+                "保存成功! \n" + uri.toString(), Toast.LENGTH_LONG).show();
+
+        this.showRecordInfo("", ""); // 清除内容
+    }
+
+    private void showRecordInfo(String score, String best) {
+        ((EditText) findViewById(R.id.tscore)).setText(score);
+        ((EditText) findViewById(R.id.tbest)).setText(best);
     }
+
+
 }
+
+

students/net1814080903141/src/main/java/edu/hzuapp/androidlabs/net1814080903141/RecordActivity.java

@@ -1,13 +1,73 @@
 package edu.hzuapp.androidlabs.net1814080903141;
 
+import android.content.ContentValues;
+
+
+import android.database.Cursor;
+import android.net.Uri;
 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 androidx.appcompat.app.AppCompatActivity;
 
 public class RecordActivity extends AppCompatActivity {
+
+    private Button btnclear;
+    private Button btncheck;
+    private StringBuilder sb;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_record);
+
+        btncheck = findViewById(R.id.btncheak);
+        btnclear=findViewById(R.id.btnclear);
+
+        final RecordActivity thisActivity = this;
+
+
+        btncheck.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                thisActivity.showRecord();
+            }
+        });
+        btnclear.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                thisActivity.clearRecord();
+            }
+        });
+    }
+    private void showRecord() {
+        sb =new  StringBuilder();
+        // 插入新记录
+        Cursor cursor=getContentResolver().query(ContentProviderOfRecords.CONTENT_URI,null,null,null,null);
+
+        if (cursor.moveToFirst()){
+            do {
+                int gscore=cursor.getInt(cursor.getColumnIndex(ContentProviderOfRecords.SCORE));
+                int gbest=cursor.getInt(cursor.getColumnIndex(ContentProviderOfRecords.BEST));
+                sb.append("Score:"+gscore+"     "+"Best:"+gbest+"\n");
+                ((TextView) findViewById(R.id.trecord)).setText(sb);
+            }while ((cursor.moveToNext()));
+
+        }
+        cursor.close();
     }
+    private void clearRecord(){
+        getContentResolver().delete(ContentProviderOfRecords.CONTENT_URI,null,null);
+        Toast.makeText(getBaseContext(), //
+                "删除成功! \n" + sb.toString(), Toast.LENGTH_LONG).show();
+        ((TextView) findViewById(R.id.trecord)).setText("");
+
+    }
+
+
 }