ReadingLogcat.java

import com.google.common.io.CharStreams;

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

/**
 * Zero error checking or recovery. Apologies.
 * 
 * Requires the READ_LOGS permission.
 */
public class ReadingLogcat {
    public static String getLogcatOutputWithGuava() throws IOException {
        Process logcat = Runtime.getRuntime().exec("logcat -d");
        return CharStreams.toString(new InputStreamReader(logcat.getInputStream()));
    }

    public static String getLogcatOutputNoGuava() throws IOException {
        Process logcat = Runtime.getRuntime().exec("logcat -d");
        BufferedReader reader = new BufferedReader(new InputStreamReader(logcat.getInputStream()));
        StringBuilder result = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            result.append(line);
        }
        return result.toString();
    }
}