AndroidでSystem.outとSystem.errをLogに転送する

Androidでは、System.outとSystem.errがLogに転送されているけれど、
任意のプライオリティと任意のタグでLogに転送するコードを作ってみた。

ついでに、はじめてGistを使ってみた。

Gistで保存するコードの先頭には、コピーライトとか書かない方がいいのかもなぁ。

	/* RuntimeInit.java
	* My favorite initialization code for Android applications.
	*
	* Copyright (C) 2011 TAKUMAKei
	*
	* 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 com.blogspot.takumakei.gist;
	import java.io.PrintStream;
	import android.util.Log;
	/**
	* The class for runtime initialization.
	*
	* <code>
	* class YourActivity extends Activity {
	* static {
	* RuntimeInit.setOut(android.util.Log.INFO, "Kei");
	* RuntimeInit.setErr(android.util.Log.ERROR, "Kei");
	* }
	* }
	* </code>
	*/
	public class RuntimeInit {
	/**
	* Redirect 'System.out' to android.util.Log with any priority and tag you want.
	*
	* @param priority from {@link android.util.Log}
	* @param tag to log
	*/
	public static void setOut(int priority, String tag) {
	try {
	System.setOut(getAndroidPrintStream(priority, tag));
	} catch (Exception e) {
	Log.e(tag, "RuntimeInit.setOut", e);
	}
	}
	/**
	* Redirect 'System.err' to android.util.Log with any priority and tag you want.
	*
	* @param priority from {@link android.util.Log}
	* @param tag to log
	*/
	public static void setErr(int priority, String tag) {
	try {
	System.setErr(getAndroidPrintStream(priority, tag));
	} catch (Exception e) {
	Log.e(tag, "RuntimeInit.setErr", e);
	}
	}
	/**
	* Create a new logging print stream.
	*
	* @param priority from {@link android.util.Log}
	* @param tag to log
	* @return A print stream which logs output line by line.
	* @throws Exception thrown when the com.android.internal.os.AndroidPrintStream was not found.
	*/
	public static PrintStream getAndroidPrintStream(int priority, String tag) throws Exception {
	return (PrintStream) (Class
	.forName("com.android.internal.os.AndroidPrintStream")
	.getConstructor(int.class, String.class)
	.newInstance(priority, tag));
	}
	}

view raw RutimeInit.java hosted with ❤ by GitHub

おもいっきりプライベートなAPI使ってるから良くない子に分類されるだろう。