以下是logcat：
06-24 13：33：04.226 23618-23618 /？ E / AndroidRuntime：致命异常：主要 处理：com.example.saleh.findmypassword，PID：23618 java.lang.IllegalArgumentException：Unknown Uri：content：//com.example.saleh.findmypassword.provider/PInfos/1 在com.example.saleh.findmypassword.PInfoProvider.update（PInfoProvider.java:161） 在android.content.ContentProvider $ Transport.update（ContentProvider.java:287） 在android.content.ContentResolver.update（ContentResolver.java:1316） 在com.example.saleh.findmypassword.EditActivity $ 1.onClick（EditActivity.java:62） 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）
Content Provider类：
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.PINFOS);
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){
case PINFOS: //only using the PInfo and not the ID because it's to insert only.
long recordID = db.insertOrThrow(PInfoDatabase.Tables.PINFOS, null, values); //inserts a row into the database
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.PINFOS, 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.PINFOS, values, selectionCriteria, selectionArgs);
}
}
EditActivity类：
public class EditActivity extends FragmentActivity {
private final String LOG_TAG = EditActivity.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); //same layout as the AddActivity class.
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 = EditActivity.this.getContentResolver();
Intent intent = getIntent(); //Getting the intent that was passed to this activity from the PInfoCustomAdapter class
final String _id = intent.getStringExtra(PInfoContract.PInfoColumns.PINFO_ID);
String website = intent.getStringExtra(PInfoContract.PInfoColumns.PINFO_WEBSITE);
String email = intent.getStringExtra(PInfoContract.PInfoColumns.PINFO_EMAIL);
String username= intent.getStringExtra(PInfoContract.PInfoColumns.PINFO_USERNAME);
String password = intent.getStringExtra(PInfoContract.PInfoColumns.PINFO_PASSWORD);
//Now to populate what's on screen:
mWebsiteTextView.setText(website);
mEmailTextView.setText(email);
mUsernameTextView.setText(username);
mPasswordTextView.setText(password);
mButton = (Button) findViewById(R.id.saveButton);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
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 uri = PInfoContract.PInfos.buildPInfoUri(_id); //To know which record we're dealing with
int recordsUpdated = mContentResolver.update(uri, values, null, null);
Log.d(LOG_TAG, "Number of records updated = " + recordsUpdated);
Intent intent = new Intent(EditActivity.this, MainActivity.class);
startActivity(intent);
finish(); //always use this when the activity's process is finished
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this); //Just allows to navigate back to the parent method. So: when someone presses home it will go back to the kain menu
break;
}
return true;
}
}
创建uri的类：
public class PInfoContract {
interface PInfoColumns {
String PINFO_ID = "_id";
String PINFO_WEBSITE = "PInfo_Website";
String PINFO_EMAIL = "PInfo_Email";
String PINFO_USERNAME = "PInfo_Username";
String PINFO_PASSWORD = "PInfo_Password";
}
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);
}
}
}
清单：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.saleh.findmypassword">
<permission android:name="com.example.saleh.findmypassword.provider.READWRITE" />
<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=".MainActivity"
android:noHistory="true"/>
<activity
android:name=".EditActivity"
android:label="@string/edit_pinfo_title"
android:parentActivityName="com.example.saleh.findmypassword.MainActivity"
android:noHistory="true"/>
<activity
android:name=".SearchActivity"
android:label="@string/search_pinfo_title"
android:parentActivityName=".MainActivity"
android:noHistory="true"/>
<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>
</manifest>