我一直试图解决这个问题很长一段时间。如果您需要更多信息，我会发布我认为足够的信息然后请问我。
public class PInfoProvider extends ContentProvider {
private PInfoDatabase mOpenHelper;
private static String TAG = PInfoProvider.class.getSimpleName();
private static final UriMatcher sUriMatcher = buildUriMatcher();
private static final int PINFOS = 100;
private static final int PINFOS_ID = 101;
private static UriMatcher buildUriMatcher(){
final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
final String authority = PInfoContract.CONTENT_AUTHORITY;
matcher.addURI(authority, "PInfos", PINFOS);
matcher.addURI(authority, "Pinfos/*", PINFOS_ID);
return matcher;
}
@Override
public boolean onCreate() {
mOpenHelper = new PInfoDatabase(getContext());
return true;
}
private void deleteDatabase(){
mOpenHelper.close();
PInfoDatabase.deleteDatabase(getContext());
mOpenHelper = new PInfoDatabase(getContext());
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
final SQLiteDatabase db = mOpenHelper.getReadableDatabase();
final int match = sUriMatcher.match(uri);
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(PInfoDatabase.Tables.PInfo);
switch(match){
case PINFOS:
//do nothing
break;
case PINFOS_ID:
String id = PInfoContract.PInfos.getPInfoId(uri);
queryBuilder.appendWhere(BaseColumns._ID + "=" + id);
break;
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, null, null, sortOrder);
//projection in content provider means the list of columns you want to return.
return cursor;
}
@Override
public String getType(Uri uri) {
final int match = sUriMatcher.match(uri);
switch(match){
case PINFOS:
return PInfoContract.PInfos.CONTENT_TYPE;
case PINFOS_ID:
return PInfoContract.PInfos.CONTENT_ITEM_TYPE;
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
//ContentValues: is a list of content values of our database such as the email and username. Contains the column names and the values we want to associate to it when we're writing to the database/
Log.v(TAG, "insert(uri=" + uri + ", values =" + values.toString());
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
final int match = sUriMatcher.match(uri);
switch(match){
//only using the PInfo and not the ID becuase it's to insert only.
case PINFOS:
long recordID = db.insertOrThrow(PInfoDatabase.Tables.PInfo, null, values);
return PInfoContract.PInfos.buildPInfoUri(String.valueOf(recordID));
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
Log.v(TAG, "delete(uri=" + uri);
if(uri.equals(PInfoContract.URI_TABLE)){
deleteDatabase();
return 0;
//This will be executed if the user didn't input a valid record id.
//Base content uri doesn't contain an ID nor a path.
}
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
final int match = sUriMatcher.match(uri);
String selectionCriteria = selection;
switch(match){
/*
case PInfo:
If this was called and didn't "break" it would change all the records in the table.
We will still leave it out because we added the database deletion code above.
break;
*/
case PINFOS_ID:
String id = PInfoContract.PInfos.getPInfoId(uri);
selectionCriteria = BaseColumns._ID + "=" + id
+ (!TextUtils.isEmpty(selection) ? "AND (" + selection + ")" : "");
return db.delete(PInfoDatabase.Tables.PInfo, selectionCriteria, selectionArgs);
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
Log.v(TAG, "update(uri=" + uri + ", values =" + values.toString());
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
final int match = sUriMatcher.match(uri);
String selectionCriteria = selection;
//We set selectionCriteria to equal selection in the case PInfo case was chosen. After all,
//we still need to record the selection.
switch(match){
case PINFOS:
//do nothing
//If this was called and didn't "break" it would change all the records in the table.
break;
case PINFOS_ID:
String id = PInfoContract.PInfos.getPInfoId(uri);
selectionCriteria = BaseColumns._ID + "=" + id
+ (!TextUtils.isEmpty(selection) ? "AND (" + selection + ")" : "");
break;
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
return db.update(PInfoDatabase.Tables.PInfo, values, selectionCriteria, selectionArgs);
}
}
和logcat中提到的另一个类：
public class AddActivity extends FragmentActivity{
private final String LOG_TAG = AddActivity.class.getSimpleName();
private TextView mWebsiteTextView, mEmailTextView, mUsernameTextView, mPasswordTextView;
private Button mButton;
private ContentResolver mContentResolver;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_edit);
getActionBar().setDisplayHomeAsUpEnabled(true); //returns up one level rather than back to the top level
mWebsiteTextView = (TextView) findViewById(R.id.pinfoWebsite);
mEmailTextView = (TextView) findViewById(R.id.pinfoEmail);
mUsernameTextView= (TextView) findViewById(R.id.pinfoUsername);
mPasswordTextView = (TextView) findViewById(R.id.pinfoPassword);
mContentResolver = AddActivity.this.getContentResolver();
mButton = (Button) findViewById(R.id.saveButton);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(isValid()){
ContentValues values = new ContentValues(); //Content Values Class is used to store a set of values that the ContentResolver can process.
values.put(PInfoContract.PInfoColumns.PINFO_WEBSITE, mWebsiteTextView.getText().toString()); //.put add values ot the set & .toString() to convert it to the right format
values.put(PInfoContract.PInfoColumns.PINFO_EMAIL, mEmailTextView.getText().toString());
values.put(PInfoContract.PInfoColumns.PINFO_USERNAME, mUsernameTextView.getText().toString());
values.put(PInfoContract.PInfoColumns.PINFO_PASSWORD, mPasswordTextView.getText().toString());
Uri returned = mContentResolver.insert(PInfoContract.URI_TABLE, values);
Log.d(LOG_TAG, "record id returned is; " + returned);
Intent intent = new Intent(AddActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish(); //always use this when the activity's process is finished
}else {
Toast.makeText(getApplicationContext(), "Please make sure you have inputted valid data.", Toast.LENGTH_LONG).show();
}
}
});
}
private boolean isValid(){ //You can have this as complex as you want. Like checking other databases or number of charas.
if(mWebsiteTextView.getText().toString().length() == 0 ||
mEmailTextView.getText().toString().length() == 0 ||
mUsernameTextView.getText().toString().length() == 0 ||
mPasswordTextView.getText().toString().length() == 0 ){
return false;
}
return true;
}
private boolean someDataEntered(){
if(mWebsiteTextView.getText().toString().length() > 0 ||
mEmailTextView.getText().toString().length() > 0 ||
mUsernameTextView.getText().toString().length() > 0 ||
mPasswordTextView.getText().toString().length() > 0 ){
return true;
}
return false;
}
@Override
public void onBackPressed() {
if(someDataEntered()){
PInfoDialog dialog = new PInfoDialog();
Bundle args = new Bundle();
args.putString(PInfoDialog.DIALOG_TYPE, PInfoDialog.CONFIRM_EXIT); //This method places a text string in the virtual screen at the specified location.
dialog.setArguments(args);
dialog.show(getSupportFragmentManager(), "confirm-exit");
} else{
super.onBackPressed(); //if someDataEntered() is false just do what usually happnes.
}
}
}
logcat的：
06-23 16：03：14.117 21940-21940 / com.example.saleh.findmypassword E / ActivityThread：无法找到com.example.saleh.findmypassword.PInfoProvider的提供商信息 06-23 16：03：14.121 21940-21940 / com.example.saleh.findmypassword W / dalvikvm：threadid = 1：线程退出未捕获的异常（group = 0xa4c95b20） 06-23 16：03：14.121 21940-21940 / com.example.saleh.findmypassword E / AndroidRuntime：FATAL EXCEPTION：main 处理：com.example.saleh.findmypassword，PID：21940 java.lang.IllegalArgumentException：未知的URL内容：//com.example.saleh.findmypassword.PInfoProvider/pinfos 在android.content.ContentResolver.insert（ContentResolver.java:1186） at com.example.saleh.findmypassword.AddActivity $ 1.onClick（AddActivity.java:51） 在android.view.View.performClick（View.java:4438） 在android.view.View $ PerformClick.run（View.java:18422） 在android.os.Handler.handleCallback（Handler.java:733） 在android.os.Handler.dispatchMessage（Handler.java:95） 在android.os.Looper.loop（Looper.java:136） 在android.app.ActivityThread.main（ActivityThread.java:5001） at java.lang.reflect.Method.invokeNative（Native Method） 在java.lang.reflect.Method.invoke（Method.java:515） 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601） 在dalvik.system.NativeStart.main（本地方法）
清单：
<uses-permission android:name="com.example.saleh.findmypassword.provider.READWRITE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.WithActionBar">
<activity
android:name=".MainActivity"
android:label="Personal Info">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".AddActivity"
android:label="@string/add_pinfo_title"
android:parentActivityName="com.example.saleh.findmypassword.MainActivity" />
<activity
android:name="com.example.saleh.findmypassword.EditActivity"
android:label="@string/edit_pinfo_title"
android:parentActivityName="com.example.saleh.findmypassword.MainActivity" />
<activity
android:name="com.example.saleh.findmypassword.SearchActivity"
android:label="@string/search_pinfo_title"
android:parentActivityName="com.example.saleh.findmypassword.MainActivity" />
`````
<provider
android:name="com.example.saleh.findmypassword.PInfoProvider"
android:authorities="com.example.saleh.findmypassword.provider"
android:exported="true"
android:readPermission="com.example.saleh.findmypassword.provider.READWRITE"
android:writePermission="com.example.saleh.findmypassword.provider.READWRITE" />
</application>
以下是建造uri的地方：
公共类PInfoContract {
public static final String CONTENT_AUTHORITY = "com.example.saleh.findmypassword.provider";
public static final Uri BASE_CONTENT_URI = Uri.parse("content://" + CONTENT_AUTHORITY);
public static final String PATH_PINFOS = "pinfos";
public static final Uri URI_TABLE = Uri.parse(BASE_CONTENT_URI.toString() + "/" + PATH_PINFOS);
public static final String[] TOP_LEVEL_PATHS = {
PATH_PINFOS
};
public static class PInfos implements PInfoColumns, BaseColumns {
public static final Uri CONTENT_URI =
BASE_CONTENT_URI.buildUpon().appendEncodedPath(PATH_PINFOS).build();
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd." + CONTENT_AUTHORITY + ".pinfos";
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd." + CONTENT_AUTHORITY + ".pinfos";
public static Uri buildPInfoUri(String PInfoId) {
return CONTENT_URI.buildUpon().appendEncodedPath(PInfoId).build();
}
public static String getPInfoId(Uri uri) {
return uri.getPathSegments().get(1);
}
}
}
答案 0 :(得分：0)
因为你有这个例外：
java.lang.IllegalArgumentException: Unknown Uri:
content://com.example.saleh.findmypassword.provider/pinfos at
com.example.saleh.findmypassword.PInfoProvider.insert(PInfoProvider.java:97>)
检查提供商的包裹，它不存在（Unknown Uri）：
com.example.saleh.findmypassword.provider
必须是：
com.example.saleh.findmypassword.PInfoProvider
<强>更新
将变量BASE_CONTENT_URI的值更改为：
public static final Uri BASE_CONTENT_URI = Uri.parse("content://com.example.saleh.findmypassword.PInfoProvider");