Question

我删除了以下单个图片：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.arshad.map.permission.MAPS_RECEIVE" />

<permission
    android:name="com.arshad.map.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:name=".Application"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity android:name=".activities.MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".activities.TweetActivity" />
    <activity android:name=".activities.LoginActivity" />

    <meta-data
        android:name="io.fabric.ApiKey"
        android:value="is not null, i deleted this" />
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="is not null, i deleted this" />

</application>

</manifest>

问题是，context.getContentResolver().delete(image.getImageUri(), null, null);中的删除速度很慢。我可以以某种方式总结交易中的删除吗？

修改

我正在删除媒体商店中的图片

Answer 1

嘿prom85我不确定你是如何加速单个删除的，但如果你需要在一个事务中批量删除几个是我写的内容提供者的批量删除方法。希望它有帮助:)！

public int bulkInsert(Uri uri, ContentValues[] values) {
        final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
        final int match = sUriMatcher.match(uri);
        switch (match) {
            case MOVIE:
                db.beginTransaction();
                int returnCount = 0;
                try {
                    for (ContentValues value : values) {
                        long _id = db.insert(MovieContract.MovieEntry.TABLE_NAME, null, value);
                        if (_id != -1) {
                            returnCount++;
                        }
                    }
                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                }
                getContext().getContentResolver().notifyChange(uri, null);
                return returnCount;
            case REVIEW:
                db.beginTransaction();
                int returnCountReview = 0;
                try {
                    for (ContentValues value : values) {
                        long _id = db.insert(MovieContract.ReviewEntry.TABLE_NAME, null, value);
                        if (_id != -1) {
                            returnCountReview++;
                        }
                    }
                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                }
                getContext().getContentResolver().notifyChange(uri, null);
                return returnCountReview;
            case TRAILER:
                db.beginTransaction();
                int returnCountTrailer = 0;
                try {
                    for (ContentValues value : values) {
                        long _id = db.insert(MovieContract.TrailerEntry.TABLE_NAME, null, value);
                        if (_id != -1) {
                            returnCountTrailer++;
                        }
                    }
                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                }
                getContext().getContentResolver().notifyChange(uri, null);
                return returnCountTrailer;
            default:
                return super.bulkInsert(uri, values);
        }
    }

ContentResolver - 在事务中运行删除查询

1 个答案: