我尝试在 Android 6.0 上的外部SD卡上写一切，我已经获得了许可。但如果我直接写G.database=SQLiteDatabase.openOrCreateDatabase()，它就会：
未知错误（代码14）：无法打开数据库
G.class
public static final String DIR_SDCARD= Environment.getExternalStorageDirectory().getAbsolutePath();
public static final String DIR_DATABASE= DIR_SDCARD+"/CallBlocker/";
ActivitySplash
public class ActivitySplash extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback{
private final int MY_PERMISSION_REQUEST_WRITE_EXTERNAL_STORAGE = 10;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
if (checkPermission()) {
File root = new File(G.DIR_DATABASE);
if (!root.exists()) {
//Create folder
root.mkdirs();
}
G.database= SQLiteDatabase.openOrCreateDatabase(root+"/database.sqlite",null);
G.database.execSQL("CREATE TABLE IF NOT EXISTS blacklist (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , num TEXT, name TEXT, sms TEXT, call TEXT)");
G.database.execSQL("CREATE TABLE IF NOT EXISTS whitelist (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , num TEXT, name TEXT, sms TEXT, call TEXT)");
G.database.execSQL("CREATE TABLE IF NOT EXISTS log (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , phone TEXT, sms TEXT, call TEXT, time TEXT, date TEXT)");
}else {
requestPermission();
}
}
private void requestPermission(){
if ((ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.WRITE_EXTERNAL_STORAGE))){
File root = new File(G.DIR_DATABASE);
if (!root.exists()) {
//Create folder
root.mkdirs();
}
G.database= SQLiteDatabase.openOrCreateDatabase(root+"/database.sqlite",null);
G.database.execSQL("CREATE TABLE IF NOT EXISTS blacklist (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , num TEXT, name TEXT, sms TEXT, call TEXT)");
G.database.execSQL("CREATE TABLE IF NOT EXISTS whitelist (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , num TEXT, name TEXT, sms TEXT, call TEXT)");
G.database.execSQL("CREATE TABLE IF NOT EXISTS log (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , phone TEXT, sms TEXT, call TEXT, time TEXT, date TEXT)");
} else {
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},10);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case MY_PERMISSION_REQUEST_WRITE_EXTERNAL_STORAGE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
finish();
startActivity(getIntent());
} else {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
new AlertDialog.Builder(this)
.setTitle("Read Contacts Permission")
.setMessage("You need to grant read contacts to use read"+"contacts fearure . Retry and grant it !!")
.show();
} else {
new AlertDialog.Builder(this)
.setTitle("Read Contacts Permission denied ")
.setMessage("You denied read Contacts Permission . so , the feature will be disabled . To enable it , go to settings and grant read contacts for the application")
.show();
}
}
break;
}
}
private boolean checkPermission(){
int result = ContextCompat.checkSelfPermission(G.context, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (result == PackageManager.PERMISSION_GRANTED){
return true;
} else {
return false;
}
}
的AndroidManifest.xml
<uses-permission <android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
LOG
java.lang.RuntimeException: Unable to start activity ComponentInfo{ir.lswg.callblocker/ir.lswg.callblocker.ActivitySplash}: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database