博客

import android.os.Build;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class RealTimeProcess {

    private String TAG = "RealTimeProcess";

    private ProcessBuilder mProcessBuilder;
    private Process recordProcess;
    private BufferedReader readStdout;
    private BufferedReader readStderr;
    private RealtimeProcessListener realtimeProcessListener; // 回调用到的接口
    private String tmp1;
    private String tmp2;


    public RealTimeProcess(RealtimeProcessListener realtimeProcessListener) {
        this.realtimeProcessListener = realtimeProcessListener;
    }

    public void start(String... commands) {
        try {
            mProcessBuilder = new ProcessBuilder(commands).redirectErrorStream(true);
            recordProcess = mProcessBuilder.start();
            exec(recordProcess);
        } catch (Exception e) {
        }

    }

    private void exec(final Process process) {
        readStdout = new BufferedReader(new InputStreamReader(process.getInputStream()));
        readStderr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
        Thread execThread = new Thread() {
            public void run() {
                try {
                    while ((tmp1 = readStdout.readLine()) != null || (tmp2 = readStderr.readLine()) != null) {
                        if (tmp1 != null) {
                            realtimeProcessListener.onNewStdoutListener(tmp1);
                        }
                        if (tmp2 != null) {
                            realtimeProcessListener.onNewStderrListener(tmp2);
                        }
                    }
                } catch (IOException e) {
                    realtimeProcessListener.onProcessFinish();
                }
            }
        };
        execThread.start();
    }

    public void destroyRealtimeProcess() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (recordProcess.isAlive()) {
                recordProcess.destroyForcibly();
            }
        }
    }

    public interface RealtimeProcessListener {

        public void onNewStdoutListener(String tmp1);

        public void onNewStderrListener(String tmp2);

        public void onProcessFinish();
    }
}

使用时可以做到抓取，同时也存在一个问题

因为大部分安卓固件存在一个日志缓冲区限制，当日志过多超出最大限制就不会再打印日志

所以需要在开发者模式找到日志缓冲区大小，调到最大测试

参考文章：

华为开发者论坛