mac 如何打开raw文件怎么打开
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发布时间：2022-04-20 20:24
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懂视网
时间：2022-04-09 08:56
package com.zyh.zyhimportdatabase;
2
3 import java.io.File;
4 import java.io.FileOutputStream;
5 import java.io.InputStream;
6
7 import android.content.Context;
8 import android.database.sqlite.SQLiteDatabase;
9 import android.os.Environment;
10
11 public class DbManager {
12 private static final int BUFFER_SIZE = 1024;
13 private static final String DB_NAME = "person2.db";
14 private static final String PACKAGE_NAME = "com.zyh.zyhimportdatabase";
15 private static final String DB_PATH = "/data" +
16 Environment.getDataDirectory().getAbsolutePath() + "/" + PACKAGE_NAME;
17
18 private SQLiteDatabase database;
19 private Context context;
20
21 public DbManager(Context context){
22 this.context = context;
23 }
24
25 public void openDatabase(){
26 this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
27 }
28
29 private SQLiteDatabase openDatabase(String dbFile) {
30 try {
31 File db_file = new File(dbFile);
32 if(!db_file.exists()){
33 InputStream is = this.context.getResources().openRawResource(R.raw.person2);
34 FileOutputStream fos = new FileOutputStream(dbFile);
35 byte[] buffer = new byte[BUFFER_SIZE];
36 int len = 0;
37 while((len = is.read(buffer)) > 0){
38 fos.write(buffer, 0, len);
39 }
40 fos.close();
41 is.close();
42 }
43
44 SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(db_file, null);
45 return db;
46 } catch (Exception e) {
47 // TODO Auto-generated catch block
48 e.printStackTrace();
49 }
50 return null;
51 }
52
53 public SQLiteDatabase getDb(){
54 return this.database;
55 }
56
57 public void closeDatabase(){
58 this.database.close();
59 }
60 }
2、activity代码
1 package com.zyh.zyhimportdatabase;
2
3 import android.os.Bundle;
4 import android.os.Environment;
5 import android.util.Log;
6 import android.app.Activity;
7 import android.database.sqlite.SQLiteDatabase;
8
9 public class MainActivity extends Activity {
10
11 @Override
12 protected void onCreate(Bundle savedInstanceState) {
13 super.onCreate(savedInstanceState);
14 setContentView(R.layout.activity_main);
15
16 //Log.i("zyh", Environment.getDataDirectory().getAbsolutePath());
17 DbManager dbHelper = new DbManager(getApplicationContext());
18 dbHelper.openDatabase();
19 SQLiteDatabase db = dbHelper.getDb();
20 System.out.println(db.isReadOnly());
21 dbHelper.closeDatabase();
22
23 }
24
25 }
上述代码的参考:http://www.cnblogs.com/xiaowenji/archive/2011/01/03/1925014.html
注意:A、关于对getReadableDatabase()的误区:可以参考http://blog.csdn.net/liuhe688/article/details/6715983/和http://blog.chinaunix.net/uid-22816738-id-3802353.html
B、关于多线程对db的使用，正确的方法可以参考:http://blog.csdn.net/sky_monkey/article/details/23820021
在把数据库文件放在raw中，在应用程序中如何打开
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热心网友
时间：2022-04-09 06:04
方法/步骤
首先打开已经安装好的PhotoShop软件，在文件菜单中选择“打开为”命令，点击该命令
在弹出的窗体中，在“打开为”的下拉框中选择Camera Raw(******)
接着浏览我们需要处理的图片或者照片，选中照片，点击“打开”按钮
然后就会打开Camera Raw软件，在弹出的窗体中，我们就可以设置图片的各种参数了
