DDMS里有个Cause GC命令，用来要求虚拟机强制GC,如下图：
但是在有些环境下面，测试同学，或者用户机器上面没有安装Android Sdk，这个时候使用adb shell来执行GC命令是比较合适的，但是网上搜索了一下，发现adb shell下没有提供这个命令。
根据网上介绍，执行GC命令实际上是通过kill命令向进程发送了数字为10的自定义信号而已，代码如下：
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private void gc() { String pid = String.valueOf(ProcessUtils .getProcessPID(AUTManager.pkn.toString())); if (!pid.equals("-1")) { boolean isSucess = true; ProcessBuilder pb = null; String cmd = "kill -10 " + pid; pb = new ProcessBuilder("su", "-c", cmd); Process exec = null; pb.redirectErrorStream(true); try { exec = pb.start(); InputStream is = exec.getInputStream(); BufferedReader reader = new BufferedReader( new InputStreamReader(is)); while ((reader.readLine()) != null) { isSucess = false; } } catch (Exception e) { e.printStackTrace(); isSucess = false; } // 至此命令算是执行成功 if (isSucess) { handler.sendEmptyMessage(5); } } else { Log.d("gc error", "pid not found!"); } } private void dumpHeap() { String pid = String.valueOf(ProcessUtils .getProcessPID(AUTManager.pkn.toString())); if (!pid.equals("-1")) { boolean isSucess = true; ProcessBuilder pb = null; String sFolder = Env.S_ROOT_DUMP_FOLDER + AUTManager.pkn.toString() + "/"; File folder = new File(sFolder); if (!folder.exists()) { folder.mkdirs(); } String cmd = "am dumpheap " + pid + " "// 命令 + Env.S_ROOT_DUMP_FOLDER + AUTManager.pkn.toString() + "/"// 输出路径 + "dump_" + pid + "_" + GTUtils.getSaveDate() + ".hprof"; // 输出文件名 pb = new ProcessBuilder("su", "-c", cmd); Process exec = null; pb.redirectErrorStream(true); try { exec = pb.start(); InputStream is = exec.getInputStream(); BufferedReader reader = new BufferedReader( new InputStreamReader(is)); while ((reader.readLine()) != null) { isSucess = false; } } catch (Exception e) { e.printStackTrace(); isSucess = false; } // 至此命令算是执行成功 if (isSucess) { handler.sendEmptyMessage(6); } } else { Log.d("dump error", "pid not found!"); } } |
相同道理，我们只要直接在adb shell里面直接向进程发送数字为10的自定义信号就可以了。