无需ROOT就能拿ANR日志

    File anrFile = null;
        String status = Environment.getExternalStorageState();
        if (status.equals(Environment.MEDIA_MOUNTED)) {
            File sd = Environment.getExternalStorageDirectory();
            String path = sd.getPath()+"/anrlog/" + sd_appName;
            FileReader input = null;
            FileWriter output = null;
            try {
                    File file = new File("/data/anr/traces.txt");
                    if(file.exists()){
                            input = new FileReader(file);  
                            output = new FileWriter(path + "/trace.txt");  
                            int read = input.read();          
                            while ( read != -1 ) {  
                                    output.write(read);   
                                    read = input.read();  
                            }             
                    }
            } catch (Exception e) {  
                    
            } finally {
                    try{if(null != input) input.close(); }catch (Exception e) {}
                    try{if(null != output) output.close(); }catch (Exception e) {}
            }
            
            anrFile = new File(path + "/trace.txt");
            if(!anrFile.exists()){
                    anrFile = null;
            }
        }