这个问题已经被许多人问过了,但是即使我按照他们的步骤来操作,仍然无法解决我的问题。我的应用在模拟器上运行良好,但在真实设备上却出现以下两个异常。第一个异常是第二个异常的主要原因,我猜测这可能是权限问题。我已经添加了
标签。<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
将其添加到清单文件中但我得到了相同的结果。我的数据库非常简单,只有一个表。此外,我已经添加了“android_metadata”表,并编辑了我的其他表的id字段为“_id”。我确定我的数据库存在于资产文件夹中。
任何帮助将不胜感激。
第一个异常。
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): Couldn't open Shajra for writing (will try read-only):
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): com.readystatesoftware.sqliteasset.SQLiteAssetHelper$SQLiteAssetException: Missing databases/Shajra file (or .zip, .gz archive) in assets, or target folder not writable
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.content.res.AssetManager.openAsset(Native Method)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.content.res.AssetManager.open(AssetManager.java:325)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.content.res.AssetManager.open(AssetManager.java:299)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.copyDatabaseFromAssets(SQLiteAssetHelper.java:436)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.createOrOpenDatabase(SQLiteAssetHelper.java:400)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:176)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:254)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.nannandotcom.MainActivity.onCreate(MainActivity.java:27)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.ActivityThread.access$1500(ActivityThread.java:135)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.os.Looper.loop(Looper.java:150)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at android.app.ActivityThread.main(ActivityThread.java:4389)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at java.lang.reflect.Method.invokeNative(Native Method)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at java.lang.reflect.Method.invoke(Method.java:507)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
02-24 12:58:10.067: E/SQLiteAssetHelper(7107): at dalvik.system.NativeStart.main(Native Method)
第二个异常
02-24 12:58:10.077: E/Database(7107): dbopen(): sqlite3_open_v2("/data/data/com.example.nannandotcom/databases/Shajra", &handle, 1, NULL) failed
02-24 12:58:10.077: E/Database(7107): dbopen(): errno = 2, error message = No such file or directory
02-24 12:58:10.077: D/AndroidRuntime(7107): Shutting down VM
02-24 12:58:10.077: W/dalvikvm(7107): threadid=1: thread exiting with uncaught exception (group=0x4011f5a0)
02-24 12:58:10.108: E/AndroidRuntime(7107): FATAL EXCEPTION: main
02-24 12:58:10.108: E/AndroidRuntime(7107): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nannandotcom/com.nannandotcom.MainActivity}: android.database.sqlite.SQLiteException: unable to open database file
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1872)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread.access$1500(ActivityThread.java:135)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.os.Handler.dispatchMessage(Handler.java:99)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.os.Looper.loop(Looper.java:150)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread.main(ActivityThread.java:4389)
02-24 12:58:10.108: E/AndroidRuntime(7107): at java.lang.reflect.Method.invokeNative(Native Method)
02-24 12:58:10.108: E/AndroidRuntime(7107): at java.lang.reflect.Method.invoke(Method.java:507)
02-24 12:58:10.108: E/AndroidRuntime(7107): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
02-24 12:58:10.108: E/AndroidRuntime(7107): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
02-24 12:58:10.108: E/AndroidRuntime(7107): at dalvik.system.NativeStart.main(Native Method)
02-24 12:58:10.108: E/AndroidRuntime(7107): Caused by: android.database.sqlite.SQLiteException: unable to open database file
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1962)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:906)
02-24 12:58:10.108: E/AndroidRuntime(7107): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:264)
02-24 12:58:10.108: E/AndroidRuntime(7107): at com.nannandotcom.MainActivity.onCreate(MainActivity.java:27)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
02-24 12:58:10.108: E/AndroidRuntime(7107): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836)
02-24 12:58:10.108: E/AndroidRuntime(7107): ... 11 more
数据库助手
package com.nannandotcom;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.nannandotcom.model.ProfileBean;
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper;
public class DatabaseHelper extends SQLiteAssetHelper {
private static final String DATABASE_NAME = "Shajra";
private static final int DATABASE_VERSION = 1;
private Context context;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
public void copyDatabase() throws IOException{
// SQLiteDatabase checkDB = SQLiteDatabase.openDatabase(context.getAssets().+(DATABASE_NAME), null, SQLiteDatabase.OPEN_READONLY);
// checkDB.close();
InputStream myInput = context.getAssets().open(DATABASE_NAME);
String outFileName = "/data/data/"+ context.getPackageName() + "/databases/" + DATABASE_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public ProfileBean getProfileBean(SQLiteDatabase database,int id){
ProfileBean profileBean = new ProfileBean();
try {
Cursor c = database.query("Profiles",
new String[]{"_id","Name","Qualification","WorkingAt","LivesAt","MaritalStatus","NumberOfChildren",
"Telephone","Email","Picture","MarriedTo","Father","Mother","DOB","Gender"},
"_id=?",
new String[]{Integer.toString(id)},null, null, null);
if (c != null ) {
if (c.moveToFirst()) {
do {
}while (c.moveToNext());
}
}
}
catch(Exception e){
e.printStackTrace();
}
return profileBean;
}
}
主活动
package com.nannandotcom;
import java.io.IOException;
import com.example.nannandotcom.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DatabaseHelper databaseHelper = new DatabaseHelper(this);
SQLiteDatabase database = databaseHelper.getReadableDatabase();
try {
databaseHelper.copyDatabase();
}
}catch(SQLException sqle){
throw sqle;
}
}
catch(Exception e){
Log.e("MainActivity", e.getMessage());
e.printStackTrace();
}
final EditText enterName = (EditText) findViewById(R.id.editText1);
Button submit = (Button) findViewById(R.id.button1);
submit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent mainActivityIntent = new Intent(MainActivity.this, Welcome.class);
mainActivityIntent.putExtra("userName", enterName.getText().toString());
startActivity(mainActivityIntent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}