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The Support Package includes static "support libraries" that you can add to your Android application in order to use APIs that are either not available for older platform versions or that offer "utility" APIs that aren't a part of the framework APIs.

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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v4.util;

import android.util.Log;

import java.io.Writer;

/**
 * Helper for accessing features in {@link android.util.LogWriter}
 * introduced after API level 4 in a backwards compatible fashion.
 *
 * @hide
 */
public class LogWriter extends Writer {
    private final String mTag;
    private StringBuilder mBuilder = new StringBuilder(128);

    /**
     * Create a new Writer that sends to the log with the given priority
     * and tag.
     *
     * @param tag A string tag to associate with each printed log statement.
     */
    public LogWriter(String tag) {
        mTag = tag;
    }

    @Override public void close() {
        flushBuilder();
    }

    @Override public void flush() {
        flushBuilder();
    }

    @Override public void write(char[] buf, int offset, int count) {
        for(int i = 0; i < count; i++) {
            char c = buf[offset + i];
            if ( c == '\n') {
                flushBuilder();
            }
            else {
                mBuilder.append(c);
            }
        }
    }

    private void flushBuilder() {
        if (mBuilder.length() > 0) {
            Log.d(mTag, mBuilder.toString());
            mBuilder.delete(0, mBuilder.length());
        }
    }
}